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#281
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Do switch mode power supplies flicker in time with mains?
"William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder wrote: On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" "William wrote: On Wed, 19 Dec 2018 17:47:17 -0000, trader_4 wrote: On Wednesday, December 19, 2018 at 11:35:06 AM UTC-5, William Gothberg wrote: On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd wrote: On 12/19/18 6:01 AM, William Gothberg wrote: [snip] They probably are fairly crude. I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. It looks absolutely ridiculous with modern cars with LED headlights in films. How hard can it be to put a smoothing capacitor on the output of the power supply? I've never noticed that. Any films come to mind? A lot of Top Gear programs showing the DRLs of cars fitted with LEDs. With a feature film, they might take the time/trouble/money to do something to stop it. It seems especially weird, since cars have a 12V supply with a big battery to smooth anything out. I guess the power supply that reduces that to whatever the LED headlights use though might have a switching power supply these days too. AFAIK it's deliberate, making the LEDs operate brighter than they are capable of, but only 1/4 of the time. Our eyes just see the brightest part of the cycle, so we think they're four times brighter than the LED is really capable of, without overheating itself. That is PWM Overdrive. Peak junction current is over the nominal rating, but the average power consumption is below nominalmaximum current - and the peak lumen output is significantly enhanced without reducing the junction life appreciably. THIS would definitely cause flicker as there is a "significant" dead period between the "strobe flashes" Agreed, although Rod thinks only freaks can see it. Its true with car lights. You're obviously wrong, We'll see... just by the number of articles on the internet about it. That's just the freaks howling about seeing it. If it were a small number of freaks, there wouldn't so many articles and studies into it. Bull****. Tell me, out of interest, when you watch TV at the usual (before HD) 25fps interlaced, can you see that it's made up of seperate images? Meaningless question. Can you notice that a moving object jumps a few inches at a time across the screen? Never seen that happen. |
#282
Posted to alt.home.repair,alt.electronics,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
On 2018-12-25 2:55 p.m., Rod Speed wrote:
"William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder wrote: On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" "William wrote: On Wed, 19 Dec 2018 17:47:17 -0000, trader_4 wrote: On Wednesday, December 19, 2018 at 11:35:06 AM UTC-5, William Gothberg wrote: On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd wrote: On 12/19/18 6:01 AM, William Gothberg wrote: [snip] They probably are fairly crude.* I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. It looks absolutely ridiculous with modern cars with LED headlights in films.* How hard can it be to put a smoothing capacitor on the output of the power supply? I've never noticed that.* Any films come to mind? A lot of Top Gear programs showing the DRLs of cars fitted with LEDs. With a feature film, they might take the time/trouble/money to do something to stop it. It seems especially weird, since cars have a 12V supply with a big battery to smooth anything out.* I guess the power supply that reduces that to whatever the LED headlights use though might have a switching power supply these days too. AFAIK it's deliberate, making the LEDs operate brighter than they are capable of, but only 1/4 of the time.* Our eyes just see the brightest part of the cycle, so we think they're four times brighter than the LED is really capable of, without overheating itself. *That is PWM Overdrive. Peak junction current is over the nominal rating, but the average power consumption is below nominalmaximum current - and the peak lumen output is significantly enhanced without reducing the junction life appreciably. *THIS would definitely cause flicker as there is a "significant" dead period between the "strobe flashes" Agreed, although Rod thinks only freaks can see it. Its true with car lights. You're obviously wrong, We'll see... just by the number of articles on the internet about it. That's just the freaks howling about seeing it. If it were a small number of freaks, there wouldn't so many articles and studies into it. Bull****. Tell me, out of interest, when you watch TV at the usual (before HD) 25fps interlaced, can you see that it's made up of seperate images? Meaningless question. Can you notice that a moving object jumps a few inches at a time across the screen? Never seen that happen. it was a popular item on the ol black n whites , westinghouse |
#283
Posted to alt.home.repair,alt.electronics,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed wrote:
"William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder wrote: On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" "William wrote: On Wed, 19 Dec 2018 17:47:17 -0000, trader_4 wrote: On Wednesday, December 19, 2018 at 11:35:06 AM UTC-5, William Gothberg wrote: On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd wrote: On 12/19/18 6:01 AM, William Gothberg wrote: [snip] They probably are fairly crude. I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. It looks absolutely ridiculous with modern cars with LED headlights in films. How hard can it be to put a smoothing capacitor on the output of the power supply? I've never noticed that. Any films come to mind? A lot of Top Gear programs showing the DRLs of cars fitted with LEDs. With a feature film, they might take the time/trouble/money to do something to stop it. It seems especially weird, since cars have a 12V supply with a big battery to smooth anything out. I guess the power supply that reduces that to whatever the LED headlights use though might have a switching power supply these days too. AFAIK it's deliberate, making the LEDs operate brighter than they are capable of, but only 1/4 of the time. Our eyes just see the brightest part of the cycle, so we think they're four times brighter than the LED is really capable of, without overheating itself. That is PWM Overdrive. Peak junction current is over the nominal rating, but the average power consumption is below nominalmaximum current - and the peak lumen output is significantly enhanced without reducing the junction life appreciably. THIS would definitely cause flicker as there is a "significant" dead period between the "strobe flashes" Agreed, although Rod thinks only freaks can see it. Its true with car lights. You're obviously wrong, We'll see... just by the number of articles on the internet about it. That's just the freaks howling about seeing it. If it were a small number of freaks, there wouldn't so many articles and studies into it. Bull****. It is a large percentage of the population that can see it. Easy to claim. Way more than the percentage of vegetarians and disabled, Easy to claim. yet they both get catered for. Because in the case of the disabled, it stops them getting around. Being a freak that sees some car lights flicker doesn't. It causes distraction while driving. Even a ****wit like yourself should realise that's a bad thing for everyone. In the case of vegetarians, pandering to them sees them buy what you are flogging and avoids them going to some other place that does pander to their freakishness. Please at least try to get your negatives right in sentences. I wonder why none of my houselights use this? Hues bulbs do, you can see that by waving something non transparent past a bulb when looking directly at a lighted bulb. Your strip house lights have far more leds so don't need to. Do car lights have to make more brightness from a smaller area? Corse they do. Or would flickery houselights annoy people more? They don't with Hue bulbs. They don't annoy YOU. They probably annoy others. You wont find anyone saying that they annoy them on the net. Depends just how flickery they are. If the frequency is high enough, they won't bother anyone. I meant that you wont be able to find anyone saying that the Hue bulbs annoy them by flickering on the net. Philips must have designed them properly. With a higher frequency above what us superior beings can see. Can you set something up to test the light output (or the voltage to the LEDs) with a scope? Not easily. The scope probes are hiding and the scope is too, even tho its pretty big. You lost an entire oscilloscope?! If it's the extra brightness, I don't understand As always. because I have a torch with a single LED and parabolic reflector that gives out 20W equivalent without overdrive. Simply have three such lamps with their own little (only 1.5 inches across) reflector next to each other to make the headlamp. Even you should have noticed that car headlights are much brighter. A car headlight SHOULD be 60W equivalent. Wrong, as always. Back in the days of incandescent lights on cars, every single car had a 55W/60W bulb for it's headlights. That's a lie too. Nope. 55W for dip and 60W for full. So 6W of LEDs, or a few of my torches per lamp. Your torches are lying about them being 20W equivalents. Actually the lie says they're 60W. I measured them as 20W. They consume 2W and give out 20W equivalent. You don't know that last. I looked up the specs for the LED it uses. I measured the current it consumes. Quite possible to just have three reflectors just like my torch, mounted together. Yes, but that's nothing like what real headlights produce light wise. A real headlight should produce the same amount of light as a 55W incandescent, They don't all produce the same. They should. There is an optimum brightness, above which you dazzle other drivers, and below which you cannot see as well. which requires about 5.5W of LEDs. There you go, mangling the real story, as always. Then state what the real story is. Easy to arrange that with reflectors and cooling without pulsing. Yeah, yeah, none of the designed of car headlights have a ****ing clue. Some unemployable drunken druggy chav knows it all. Yeah, right. No, most car designers did it right, I'm talking about approximately 1 in 5 cars are done wrongly. |
#284
Posted to alt.home.repair,alt.electronics,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
On Tue, 25 Dec 2018 21:51:13 -0000, % wrote:
On 2018-12-25 2:33 p.m., William Gothberg wrote: On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder wrote: On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" "William wrote: On Wed, 19 Dec 2018 17:47:17 -0000, trader_4 wrote: On Wednesday, December 19, 2018 at 11:35:06 AM UTC-5, William Gothberg wrote: On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd wrote: On 12/19/18 6:01 AM, William Gothberg wrote: [snip] They probably are fairly crude. I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. It looks absolutely ridiculous with modern cars with LED headlights in films. How hard can it be to put a smoothing capacitor on the output of the power supply? I've never noticed that. Any films come to mind? A lot of Top Gear programs showing the DRLs of cars fitted with LEDs. With a feature film, they might take the time/trouble/money to do something to stop it. It seems especially weird, since cars have a 12V supply with a big battery to smooth anything out. I guess the power supply that reduces that to whatever the LED headlights use though might have a switching power supply these days too. AFAIK it's deliberate, making the LEDs operate brighter than they are capable of, but only 1/4 of the time. Our eyes just see the brightest part of the cycle, so we think they're four times brighter than the LED is really capable of, without overheating itself. That is PWM Overdrive. Peak junction current is over the nominal rating, but the average power consumption is below nominalmaximum current - and the peak lumen output is significantly enhanced without reducing the junction life appreciably. THIS would definitely cause flicker as there is a "significant" dead period between the "strobe flashes" Agreed, although Rod thinks only freaks can see it. Its true with car lights. You're obviously wrong, We'll see... just by the number of articles on the internet about it. That's just the freaks howling about seeing it. If it were a small number of freaks, there wouldn't so many articles and studies into it. Bull****. Tell me, out of interest, when you watch TV at the usual (before HD) 25fps interlaced, can you see that it's made up of seperate images? Can you notice that a moving object jumps a few inches at a time across the screen? if the dope is good enough Don't need dope to see the TV for what it really is. A series of still images intended to fool those with slow eyesight. That's why HD has progressive encoding, doubling the frame rate. |
#285
Posted to alt.home.repair,alt.electronics,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
On Tue, 25 Dec 2018 21:55:16 -0000, Rod Speed wrote:
"William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder wrote: On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" "William wrote: On Wed, 19 Dec 2018 17:47:17 -0000, trader_4 wrote: On Wednesday, December 19, 2018 at 11:35:06 AM UTC-5, William Gothberg wrote: On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd wrote: On 12/19/18 6:01 AM, William Gothberg wrote: [snip] They probably are fairly crude. I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. It looks absolutely ridiculous with modern cars with LED headlights in films. How hard can it be to put a smoothing capacitor on the output of the power supply? I've never noticed that. Any films come to mind? A lot of Top Gear programs showing the DRLs of cars fitted with LEDs. With a feature film, they might take the time/trouble/money to do something to stop it. It seems especially weird, since cars have a 12V supply with a big battery to smooth anything out. I guess the power supply that reduces that to whatever the LED headlights use though might have a switching power supply these days too. AFAIK it's deliberate, making the LEDs operate brighter than they are capable of, but only 1/4 of the time. Our eyes just see the brightest part of the cycle, so we think they're four times brighter than the LED is really capable of, without overheating itself. That is PWM Overdrive. Peak junction current is over the nominal rating, but the average power consumption is below nominalmaximum current - and the peak lumen output is significantly enhanced without reducing the junction life appreciably. THIS would definitely cause flicker as there is a "significant" dead period between the "strobe flashes" Agreed, although Rod thinks only freaks can see it. Its true with car lights. You're obviously wrong, We'll see... just by the number of articles on the internet about it. That's just the freaks howling about seeing it. If it were a small number of freaks, there wouldn't so many articles and studies into it. Bull****. Tell me, out of interest, when you watch TV at the usual (before HD) 25fps interlaced, can you see that it's made up of seperate images? Meaningless question. It would show us whether our eyes are inferior or not. Can you notice that a moving object jumps a few inches at a time across the screen? Never seen that happen. Then your eyesight really sux. I guess you don't bother with HD TV. I guess if you play computer games you don't care if the CPU is slow and the frame rate is abysmal. |
#286
Posted to alt.home.repair,alt.electronics,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
On 2018-12-25 3:09 p.m., William Gothberg wrote:
On Tue, 25 Dec 2018 21:51:13 -0000, % wrote: On 2018-12-25 2:33 p.m., William Gothberg wrote: On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder wrote: On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" "William wrote: On Wed, 19 Dec 2018 17:47:17 -0000, trader_4 wrote: On Wednesday, December 19, 2018 at 11:35:06 AM UTC-5, William Gothberg wrote: On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd wrote: On 12/19/18 6:01 AM, William Gothberg wrote: [snip] They probably are fairly crude.* I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. It looks absolutely ridiculous with modern cars with LED headlights in films.* How hard can it be to put a smoothing capacitor on the output of the power supply? I've never noticed that.* Any films come to mind? A lot of Top Gear programs showing the DRLs of cars fitted with LEDs. With a feature film, they might take the time/trouble/money to do something to stop it. It seems especially weird, since cars have a 12V supply with a big battery to smooth anything out.* I guess the power supply that reduces that to whatever the LED headlights use though might have a switching power supply these days too. AFAIK it's deliberate, making the LEDs operate brighter than they are capable of, but only 1/4 of the time.* Our eyes just see the brightest part of the cycle, so we think they're four times brighter than the LED is really capable of, without overheating itself. *That is PWM Overdrive. Peak junction current is over the nominal rating, but the average power consumption is below nominalmaximum current - and the peak lumen output is significantly enhanced without reducing the junction life appreciably. *THIS would definitely cause flicker as there is a "significant" dead period between the "strobe flashes" Agreed, although Rod thinks only freaks can see it. Its true with car lights. You're obviously wrong, We'll see... just by the number of articles on the internet about it. That's just the freaks howling about seeing it. If it were a small number of freaks, there wouldn't so many articles and studies into it. Bull****. Tell me, out of interest, when you watch TV at the usual (before HD) 25fps interlaced, can you see that it's made up of seperate images?* Can you notice that a moving object jumps a few inches at a time across the screen? if the dope is good enough Don't need dope to see the TV for what it really is.* A series of still images intended to fool those with slow eyesight.* That's why HD has progressive encoding, doubling the frame rate. i like when you show your sense of humor |
#287
Posted to alt.home.repair,alt.electronics,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
On Tue, 25 Dec 2018 22:21:27 -0000, % wrote:
On 2018-12-25 3:09 p.m., William Gothberg wrote: On Tue, 25 Dec 2018 21:51:13 -0000, % wrote: On 2018-12-25 2:33 p.m., William Gothberg wrote: On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder wrote: On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" "William wrote: On Wed, 19 Dec 2018 17:47:17 -0000, trader_4 wrote: On Wednesday, December 19, 2018 at 11:35:06 AM UTC-5, William Gothberg wrote: On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd wrote: On 12/19/18 6:01 AM, William Gothberg wrote: [snip] They probably are fairly crude. I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. It looks absolutely ridiculous with modern cars with LED headlights in films. How hard can it be to put a smoothing capacitor on the output of the power supply? I've never noticed that. Any films come to mind? A lot of Top Gear programs showing the DRLs of cars fitted with LEDs. With a feature film, they might take the time/trouble/money to do something to stop it. It seems especially weird, since cars have a 12V supply with a big battery to smooth anything out. I guess the power supply that reduces that to whatever the LED headlights use though might have a switching power supply these days too. AFAIK it's deliberate, making the LEDs operate brighter than they are capable of, but only 1/4 of the time. Our eyes just see the brightest part of the cycle, so we think they're four times brighter than the LED is really capable of, without overheating itself. That is PWM Overdrive. Peak junction current is over the nominal rating, but the average power consumption is below nominalmaximum current - and the peak lumen output is significantly enhanced without reducing the junction life appreciably. THIS would definitely cause flicker as there is a "significant" dead period between the "strobe flashes" Agreed, although Rod thinks only freaks can see it. Its true with car lights. You're obviously wrong, We'll see... just by the number of articles on the internet about it. That's just the freaks howling about seeing it. If it were a small number of freaks, there wouldn't so many articles and studies into it. Bull****. Tell me, out of interest, when you watch TV at the usual (before HD) 25fps interlaced, can you see that it's made up of seperate images? Can you notice that a moving object jumps a few inches at a time across the screen? if the dope is good enough Don't need dope to see the TV for what it really is. A series of still images intended to fool those with slow eyesight. That's why HD has progressive encoding, doubling the frame rate. i like when you show your sense of humor It's spelt humour. And I wasn't being funny, I was stating a fact - SD TV is ****. |
#288
Posted to alt.home.repair,alt.electronics,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
"William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder wrote: On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" "William wrote: On Wed, 19 Dec 2018 17:47:17 -0000, trader_4 wrote: On Wednesday, December 19, 2018 at 11:35:06 AM UTC-5, William Gothberg wrote: On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd wrote: On 12/19/18 6:01 AM, William Gothberg wrote: [snip] They probably are fairly crude. I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. It looks absolutely ridiculous with modern cars with LED headlights in films. How hard can it be to put a smoothing capacitor on the output of the power supply? I've never noticed that. Any films come to mind? A lot of Top Gear programs showing the DRLs of cars fitted with LEDs. With a feature film, they might take the time/trouble/money to do something to stop it. It seems especially weird, since cars have a 12V supply with a big battery to smooth anything out. I guess the power supply that reduces that to whatever the LED headlights use though might have a switching power supply these days too. AFAIK it's deliberate, making the LEDs operate brighter than they are capable of, but only 1/4 of the time. Our eyes just see the brightest part of the cycle, so we think they're four times brighter than the LED is really capable of, without overheating itself. That is PWM Overdrive. Peak junction current is over the nominal rating, but the average power consumption is below nominalmaximum current - and the peak lumen output is significantly enhanced without reducing the junction life appreciably. THIS would definitely cause flicker as there is a "significant" dead period between the "strobe flashes" Agreed, although Rod thinks only freaks can see it. Its true with car lights. You're obviously wrong, We'll see... just by the number of articles on the internet about it. That's just the freaks howling about seeing it. If it were a small number of freaks, there wouldn't so many articles and studies into it. Bull****. It is a large percentage of the population that can see it. Easy to claim. Way more than the percentage of vegetarians and disabled, Easy to claim. yet they both get catered for. Because in the case of the disabled, it stops them getting around. Being a freak that sees some car lights flicker doesn't. It causes distraction while driving. Only to freaks. And even you should have noticed that the regulatory authoritys have not proscribed car lights that can be seen to flicker by freaks. Even a ****wit like yourself should realise that's a bad thing for everyone. Even a terminal ****wit should have noticed that the regulatory authoritys have not proscribed car lights that can be seen to flicker by freaks. In the case of vegetarians, pandering to them sees them buy what you are flogging and avoids them going to some other place that does pander to their freakishness. Please at least try to get your negatives right in sentences. Nothing wrong the negatives in that sentence. I wonder why none of my houselights use this? Hues bulbs do, you can see that by waving something non transparent past a bulb when looking directly at a lighted bulb. Your strip house lights have far more leds so don't need to. Do car lights have to make more brightness from a smaller area? Corse they do. Or would flickery houselights annoy people more? They don't with Hue bulbs. They don't annoy YOU. They probably annoy others. You wont find anyone saying that they annoy them on the net. Depends just how flickery they are. If the frequency is high enough, they won't bother anyone. I meant that you wont be able to find anyone saying that the Hue bulbs annoy them by flickering on the net. Philips must have designed them properly. With a higher frequency above what us superior beings can see. What you freaks whine about, actually. Can you set something up to test the light output (or the voltage to the LEDs) with a scope? Not easily. The scope probes are hiding and the scope is too, even tho its pretty big. You lost an entire oscilloscope?! Not lost, just cant remember where it ended up and can't be bothered looking for it. If it's the extra brightness, I don't understand As always. because I have a torch with a single LED and parabolic reflector that gives out 20W equivalent without overdrive. Simply have three such lamps with their own little (only 1.5 inches across) reflector next to each other to make the headlamp. Even you should have noticed that car headlights are much brighter. A car headlight SHOULD be 60W equivalent. Wrong, as always. Back in the days of incandescent lights on cars, every single car had a 55W/60W bulb for it's headlights. That's a lie too. Nope. Corse it is with that stupid every single car claim. My current car, which has incandescent headlights doesn't have that. 55W for dip and 60W for full. So 6W of LEDs, or a few of my torches per lamp. Your torches are lying about them being 20W equivalents. Actually the lie says they're 60W. I measured them as 20W. They consume 2W and give out 20W equivalent. You don't know that last. I looked up the specs for the LED it uses. I measured the current it consumes. Quite possible to just have three reflectors just like my torch, mounted together. Yes, but that's nothing like what real headlights produce light wise. A real headlight should produce the same amount of light as a 55W incandescent, They don't all produce the same. They should. Wrong, as always. There is an optimum brightness, above which you dazzle other drivers, Not possible with high beam, stupid. and below which you cannot see as well. Even sillier than you usually manage, and that's saying something. It isnt just the wattage that matters, its also the beam shape with dipped headlights. which requires about 5.5W of LEDs. There you go, mangling the real story, as always. Then state what the real story is. There is no nice tidy number like that. Depends on the beam with dipped lights and the more the better with high beam lights within reason. That's why plenty add driving lights. Easy to arrange that with reflectors and cooling without pulsing. Yeah, yeah, none of the designed of car headlights have a ****ing clue. Some unemployable drunken druggy chav knows it all. Yeah, right. No, most car designers did it right, I'm talking about approximately 1 in 5 cars are done wrongly. Stupid way for those to do it. Makes a lot more sense to do it the way those that did it right did if if you do want to pander to freaks. |
#289
Posted to alt.home.repair,alt.electronics,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
"William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 21:55:16 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder wrote: On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" "William wrote: On Wed, 19 Dec 2018 17:47:17 -0000, trader_4 wrote: On Wednesday, December 19, 2018 at 11:35:06 AM UTC-5, William Gothberg wrote: On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd wrote: On 12/19/18 6:01 AM, William Gothberg wrote: [snip] They probably are fairly crude. I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. It looks absolutely ridiculous with modern cars with LED headlights in films. How hard can it be to put a smoothing capacitor on the output of the power supply? I've never noticed that. Any films come to mind? A lot of Top Gear programs showing the DRLs of cars fitted with LEDs. With a feature film, they might take the time/trouble/money to do something to stop it. It seems especially weird, since cars have a 12V supply with a big battery to smooth anything out. I guess the power supply that reduces that to whatever the LED headlights use though might have a switching power supply these days too. AFAIK it's deliberate, making the LEDs operate brighter than they are capable of, but only 1/4 of the time. Our eyes just see the brightest part of the cycle, so we think they're four times brighter than the LED is really capable of, without overheating itself. That is PWM Overdrive. Peak junction current is over the nominal rating, but the average power consumption is below nominalmaximum current - and the peak lumen output is significantly enhanced without reducing the junction life appreciably. THIS would definitely cause flicker as there is a "significant" dead period between the "strobe flashes" Agreed, although Rod thinks only freaks can see it. Its true with car lights. You're obviously wrong, We'll see... just by the number of articles on the internet about it. That's just the freaks howling about seeing it. If it were a small number of freaks, there wouldn't so many articles and studies into it. Bull****. Tell me, out of interest, when you watch TV at the usual (before HD) 25fps interlaced, can you see that it's made up of seperate images? Meaningless question. It would show us whether our eyes are inferior or not. Only if it was actually a viable question. Can you notice that a moving object jumps a few inches at a time across the screen? Never seen that happen. Then your eyesight really sux. Nope, those doing the movie have enough of a clue to film it properly so that doesn't happen. I guess you don't bother with HD TV. Guess again. I guess if you play computer games you don't care if the CPU is slow and the frame rate is abysmal. The only computer game I bother with is Freecell Pro and it works fine with any cpu and the frame rate is never a problem. |
#290
Posted to alt.home.repair
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Do switch mode power supplies flicker in time with mains?
On Thu, 20 Dec 2018 04:14:28 -0000, Clare Snyder wrote:
On Wed, 19 Dec 2018 12:49:47 -0000, "William Gothberg" "William wrote: On Wed, 19 Dec 2018 12:28:04 -0000, Rod Speed wrote: "William Gothberg" "William wrote in message news On Wed, 19 Dec 2018 11:51:35 -0000, Rod Speed wrote: William Gothberg "William wrote Do switch mode power supplies flicker in time with mains? No. Specifically LED power supplies in commercially available domestic lamps. None of mine flicker at all. By in time, I don't mean at the same 50/60Hz, but anchored to it. I.e. if you have several such lamps each with their own built in supply, will they all flicker in time, using the mains frequency to keep them in time, or will they be random, making the room overall not flicker due to them all being random? None of mine flicker at all. And is there any way I can test this? Yes, Get or make a strobe disk or use one of the original LP disks that has a strobe disk on it and see what it looks like with the lights illuminating it. You'll get it appearing to freeze when rotating if the light level is varying in synch with the mains frequency. I tried taking photos of them, but my camera only goes as fast as 1/2000th of a second, which shows all the lights at the same brightness each time, I suspect the flicker is above 2000Hz. Or they don't flicker at all. No reason why a proper switched mode power supply needs to have any AC component at all on its output. The cruder ones may well do. They probably are fairly crude. I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. But it's nothing like as low as 50Hz. What I want to know is if the higher frequency they're flickering at is anchored with the rise of the AC wave. No its not. I.e. will all the LED lights in the room flicker at precisely the same time, or will they be out of synch (due to tolerances in the circuitry of each PSU) Due to it not being synched with the mains, actually. I meant if the PSUs were absolutely identical, and all the lights were switched on at the same time (with one lightswitch), they should remain in synch forever. But since there are tolerances in all the components in the PSUs, they won't stay in time. and fudge the brightness together. Its not a fudge, it's the lack of synch. I didn't mean fudge, I meant smudge. And you should be able to see that by watching the chuck as you move the drill between lights. The rate and direction of rotation should change. Only if the frequency is different, which I doubt as they are all the same model. What I need is a way of detecting if they're flashing together. Dp ypou KNOW it is a true SMPS? or is it just a edge triggered chopper feeding a full wave bridge rectifier? Something like a dimmer switch feeding a rectifier with a crude filter on the output? - or even a simple transformer and rectifier? or a "capacitive dropper" circuit???? ANy of these will flicker with mains frequency or a multiple - which COULD be filtered to reduce or eliminate the flicker. I'm not entirely sure, it's so small I can't see both sides of (as in tracks on) the circuit board without disassembling it. The mains AC is bridge rectified into a capacitor at 340VDC (or whatever results from the AC voltage input - it is rated at 85-265VAC). This is then fed using a small microchip and an inductor and a few surface mount passives to another capacitor, which serves as a smoother for the LED string at 70VDC. If I short out some of the LED string, the voltage is dropped instantly to maintain the correct current. It is actually referred to as an SMPS, it's this one exactly: https://www.aliexpress.com/item/10pc...361438466.html |
#291
Posted to alt.home.repair,uk.d-i-y,alt.electronics
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Do switch mode power supplies flicker in time with mains?
On Thu, 20 Dec 2018 03:54:10 -0000, Clare Snyder wrote:
On Wed, 19 Dec 2018 11:23:00 -0000, "William Gothberg" "William wrote: Do switch mode power supplies flicker in time with mains? Specifically LED power supplies in commercially available domestic lamps. By in time, I don't mean at the same 50/60Hz, but anchored to it. I.e. if you have several such lamps each with their own built in supply, will they all flicker in time, using the mains frequency to keep them in time, or will they be random, making the room overall not flicker due to them all being random? And is there any way I can test this? I tried taking photos of them, but my camera only goes as fast as 1/2000th of a second, which shows all the lights at the same brightness each time, I suspect the flicker is above 2000Hz. Leds (at least white ones) on a switch mode supply will not flicker because the persistance of the phosphor is longer than the period of the switching frequency which is more than 100kHz - typically 2 mhz. The answer to the second part of the question is no, the switching is not syncronized to the mains frequency on MOST switch mode power supplies. I'm definitely getting 100Hz flicker from it, I timed it using a slow camera shot (1/10th of a second) while moving the LED across the camera's field of vision. There were exactly 10 bright spots, although they were only 8% brighter than the dim spots. The LEDs don't go off completely. It's enough of a flicker for me to see with my eyes if I scan past the light, and I can detect anomalies when watching something rotating, like a drill chuck. I've got an oscilloscope on order, then I'll be able to check the signal to the LEDs (and in other parts of the supply) accurately. |
#292
Posted to alt.home.repair,alt.checkmate
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Do switch mode power supplies flicker in time with mains?
On Thu, 20 Dec 2018 18:29:36 -0000, Skeeter wrote:
In article , "William says... On Thu, 20 Dec 2018 17:04:50 -0000, Sir Gaygory's Owner's Owner ?? wrote: On Thu, 20 Dec 2018 08:34:35 -0800 (PST), LO AND BEHOLD; trader_4 determined that the following was of great importance and subsequently decided to freely share it with us in : ??????????? On Thursday, December 20, 2018 at 7:51:32 AM UTC-5, William Gothberg ??????????? wrote: ??????????? ??????????? On Thu, 20 Dec 2018 04:31:31 -0000, Clare Snyder ??????????? ??????????? wrote: ??????????? ??????????? ??????????? On Wed, 19 Dec 2018 13:03:19 -0500, "Clark W. Griswold" ??????????? ??????????? ??????????? wrote: ??????????? ??????????? ??????????? ??????????? On 12/19/2018 11:36 AM, William Gothberg wrote: ??????????? ??????????? ??????????? ??????????? ??????????? On Wed, 19 Dec 2018 16:18:29 -0000, Mark Lloyd wrote: ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? On 12/19/18 5:23 AM, William Gothberg wrote: ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? Do switch mode power supplies flicker in time with mains? Specifically ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? LED power supplies in commercially available domestic lamps. By in time, ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? I don't mean at the same 50/60Hz, but anchored to it. I.e. if you have ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? several such lamps each with their own built in supply, will they all ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? flicker in time, using the mains frequency to keep them in time, or ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? will they be random, making the room overall not flicker due to them ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? all being random? And is there any way I can test this? I tried ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? taking photos of them, but my camera only goes as fast as 1/2000th of a ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? second, which shows all the lights at the same brightness each time, I ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? suspect the flicker is above 2000Hz. ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? I once had an audio amplifier with a solar cell rather than a microphone ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? for the input transducer. This made it possible to listen to light. The ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? sun is steady, incandescent lights (AC powered) hum. That was 40 years ??????????? ??????????? ??????????? ??????????? ??????????? ??????????? ago. Maybe something like that would work today. ??????????? ??????????? ??????????? ??????????? ??????????? The trouble is I want to compare 2kHz+ from one light with 2kHz+ from a ??????????? ??????????? ??????????? ??????????? ??????????? neighbouring light and see if they're in sync. ??????????? ??????????? ??????????? ??????????? Maybe use a dual trace oscilloscope? Since this landed in ??????????? ??????????? ??????????? ??????????? alt.home.repair, I gotta ask. Do you have single-phase or two-phase? ??????????? ??????????? ??????????? No such thing as "2 phase" - ??????????? ??????????? Perhaps he meant split phase, like in the USA - centre tapped 240V. ??????????? ??????????? Which could conceivably mean I could have some lights on each circuit, ??????????? ??????????? and if they were fed by half wave rectification, flickering at 50Hz, ??????????? ??????????? they could be out of time with each other and make the whole room ??????????? ??????????? flicker at 100Hz, filling in each other's gaps. Mind you the same can ??????????? ??????????? happen by just putting the bulb in the other way (in the UK bayonet cap ??????????? ??????????? fittings allow you to connect live/neutral the other way at random with ??????????? ??????????? bulbs). ??????????? ??????????? They won't be out of time with each other as each circuit is reaching ??????????? it's peak value at exactly the same time. That's how you get 240V, ??????????? 120+120 = 240. they know a lot about this over in alt.checkmate What the **** are all those stars for? it's called attribution, don't you know anything? Those use the |
#293
Posted to alt.electronics,alt.home.repair,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
William Gothberg wrote on 20/12/2018 11:34 PM:
On Thu, 20 Dec 2018 07:09:59 -0000, Daniel60 wrote: Mark Lloyd wrote on 20/12/2018 3:21 AM: On 12/19/18 6:01 AM, William Gothberg wrote: [snip] They probably are fairly crude.* I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. ... and, in real life, the Mag wheels of some cars seem to be spinning backwards, dependant on the speed at which the car is travelling!! In real life?* I assume you mean under streetlighting.* That effect can't occur with a steady lightsource such as the sun. No, I'm sure I've noticed it in sunlight, as well. And my 'real life' was to distinguish from the mentioned "wagon wheels in movies"! -- Daniel |
#294
Posted to alt.electronics,alt.home.repair,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
"Daniel60" wrote in message
... They probably are fairly crude. I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. ... and, in real life, the Mag wheels of some cars seem to be spinning backwards, dependant on the speed at which the car is travelling!! That's not what I'd call flicker, which is when an object is illuminated sufficiently infrequently that you can see each pulse of light, even when there's no motion in the scene. CRT TVs, especially European 625/25 as opposed to US 525/30, were prone to flicker, especially if you saw one out of the corner of your eye which seems to be more sensitive to flicker. CRT computer monitors on 50 Hz progressive flicker more than on 60 Hz, and 72 or 90 Hz are better still. Interlaced scans are smoother for the same refresh rate, but suffer from "twitter" where alternate lines flicker even though the picture as a whole looks constant. What you are describing is a stroboscopic effect of viewing a moving contrasty object by intermittent light. That can happen at any intermittent rate, even those which are far faster than the eye perceive as flicker. If you let your eyes pan across an LED, you will see several images of it for a fraction of a second - it's noticeable with some car rear lights or some traffic lights, if there is relative motion (you are driving past the car or traffic light). In real life? I assume you mean under streetlighting. That effect can't occur with a steady lightsource such as the sun. No, I'm sure I've noticed it in sunlight, as well. If you are seeing stroboscopic effects under DC light or sunlight, which are constant not intermittent light level, then there's something very odd going on. And my 'real life' was to distinguish from the mentioned "wagon wheels in movies"! My dad's old record player had two sets of black and white stripes round the edge of the turntable, so you could set the correct speed stroboscopically under 50 Hz or 60 Hz mains light. What was surprising was that it worked even with filament lights which have a long thermal inertia, so the light doesn't change instantly from on to off, as with a LED or fluorescent tube (*), but decays gradually. Despite this, the stripes were still fairly sharp and not blurred. Of course, any setting of the turntable speed is only as accurate as the mains frequency at the time, which can vary by up to +/- 0.5 Hz (http://mainsfrequency.uk/fm-home). I think the strobe markings were calibrated for 33 1/3 rpm, with the assumption that the "gearing" (sprockets or friction wheels) for the other speeds was exact, so if you calibrated at one speed, it would be correct by definition at the other speeds. (*) OK, with a fluorescent you see two images: a bluish one caused by the very rapid on-to-off transition of the mercury discharge and a yellowish one caused by the more gradual decay of the phosphor, though this decay is still a lot quicker than the light from a filament bulb. |
#295
Posted to alt.electronics,alt.home.repair,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
On 31/12/2018 15:01, NY wrote:
If you are seeing stroboscopic effects under DC light or sunlight, which are constant not intermittent light level, then there's something very odd going on. something ELSE going on. leaves in the breeze casting dappled shade... in a moving car running past an avenue of trees... -- I would rather have questions that cannot be answered... ....than to have answers that cannot be questioned Richard Feynman |
#296
Posted to alt.electronics,alt.home.repair,uk.d-i-y
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Do switch mode power supplies flicker in time with mains?
"The Natural Philosopher" wrote in message
... On 31/12/2018 15:01, NY wrote: If you are seeing stroboscopic effects under DC light or sunlight, which are constant not intermittent light level, then there's something very odd going on. something ELSE going on. leaves in the breeze casting dappled shade... in a moving car running past an avenue of trees... True, although I was assuming that the OP really did mean constant sunlight, not sunlight modified by periodic variations due to shadows. Even in bright sunlight I'm sure I could easily "freeze" a rotating object if it was illuminated by direct sunlight coming through the spinning blades of a desk fan :-) The stroboscopic freezing of spinning objects can be very serious. My grandpa was a model engineer in his spare time and he had a lathe. The room was illuminated by fluorescent tubes, but he made sure that the light which he shone on the work used a tungsten bulb with a nice long time constant to avoid the chuck appearing to be stationary or slow-moving even though it was spinning fast, so he didn't instinctively touch the tool to change it, thinking that it had stopped. I wonder what precautions are used nowadays with the increased use of (pulsed) LED lights. Maybe two banks of LEDs which are 180 degrees out of phase so the light level is constant even though all the LEDs are flashing quickly with a variable mark-space ratio to control the required brightness. Or else maybe a random element added to the flashing rate. I have an LED desk lamp and the coarse brightness control is by switching on one or both banks of LEDs (fine adjustment is by variable M:S ratio), and with only one bank lit there is a lot more strobing (*) than with both banks, so I bet the two banks are out of phase. (*) For example if you move your finger rapidly from side to side. |
#297
Posted to alt.electronics,alt.home.repair,uk.d-i-y,alt.sci.physics
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Do switch mode power supplies flicker in time with mains?
On Mon, 31 Dec 2018 12:36:09 -0000, Daniel60 wrote:
William Gothberg wrote on 20/12/2018 11:34 PM: On Thu, 20 Dec 2018 07:09:59 -0000, Daniel60 wrote: Mark Lloyd wrote on 20/12/2018 3:21 AM: On 12/19/18 6:01 AM, William Gothberg wrote: [snip] They probably are fairly crude. I know they flicker, for example if I use my cordless drill, the chuck appears to spin the wrong way under the LED lighting. I remember seeing that with a washing machine (under fluorescent lights). As the tub was slowing down, the row of holes around the tub would appear to reverse direction. Same thing with (spoked) wagon wheels in movies. ... and, in real life, the Mag wheels of some cars seem to be spinning backwards, dependant on the speed at which the car is travelling!! In real life? I assume you mean under streetlighting. That effect can't occur with a steady lightsource such as the sun. No, I'm sure I've noticed it in sunlight, as well. And my 'real life' was to distinguish from the mentioned "wagon wheels in movies"! There is no way you could observe reverse rotation with the naked eye and a constant light source such as the sun. You need a light source that illuminates intermittently, the timing so that the spokes have moved quite a distance, so you assume they moved backwards. |
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