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LED lamps, source and value
I'd like to replace all the lamps/bulb in house with LED ones (mains
bayonett fittings). I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? I'd just like to ask if someone can recommend a site to buy such lamps from? My 'friends' google and ebay has zillions, but don't want to end up with a stack of fakes. A bit cynical but it adds up to quite a sum to change them all. Seen a few comments saying Lidl/Aldi LED lamps are good value and quality.Thanks for any info on this. OT: Afaik the LED lamps really are LED arrays - so I guess there is some arsenic toxicity risk in disposal? (Minute amounts). And CFL's have Hg. Just mention this because Sains.s lamp recycling bin is always crammed full of CFL's - many are smashed! |
LED lamps, source and value
On 20/01/2017 13:08, dave wrote:
I'd like to replace all the lamps/bulb in house with LED ones (mains bayonett fittings). I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? Not even close. You should be able to get 15W ones for that price. eg https://www.amazon.co.uk/Philips-Bay...dp/B01KHIMDS6/ Or 2 packs of 8W ones. https://www.amazon.co.uk/Philips-Bay...dp/B01KHILBV6/ Plenty of other brands are OK too. Dimmable ones are more expensive. I'd just like to ask if someone can recommend a site to buy such lamps from? My 'friends' google and ebay has zillions, but don't want to end up with a stack of fakes. A bit cynical but it adds up to quite a sum to change them all. Seen a few comments saying Lidl/Aldi LED lamps are good value and quality.Thanks for any info on this. Amazon have plenty of genuine ones. I have bought some specialist LED bulbs direct from China on eBay and they were OK too - at least for what I wanted them for. I suspect exposed bare LEDs isn't ideal if you are putting them where small fingers might touch them. -- Regards, Martin Brown |
LED lamps, source and value
In article ,
dave wrote: I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? Not an expert, but the LEDs in my local Tesco seem to be a lot more expensive than the local ASDA. And the ASDA ones I've bought dim with a normal dimmer too. The Tesco ones I looked at say 'not dimmable'. But I've not used LEDs anywhere they matter yet. Same as CFL. OK for just providing light of a sort - but until they are as good as halogen I'll stick to them. -- *INDECISION is the key to FLEXIBILITY * Dave Plowman London SW To e-mail, change noise into sound. |
LED lamps, source and value
I don't like halogen. gives me a headache even though I cannot see. I get
this spreading green yellow flashing haze when I go near Halogen lighting. Goes to prove I guess that even blind eyes can give strange effects. Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! "Dave Plowman (News)" wrote in message ... In article , dave wrote: I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? Not an expert, but the LEDs in my local Tesco seem to be a lot more expensive than the local ASDA. And the ASDA ones I've bought dim with a normal dimmer too. The Tesco ones I looked at say 'not dimmable'. But I've not used LEDs anywhere they matter yet. Same as CFL. OK for just providing light of a sort - but until they are as good as halogen I'll stick to them. -- *INDECISION is the key to FLEXIBILITY * Dave Plowman London SW To e-mail, change noise into sound. |
LED lamps, source and value
On 20/01/2017 13:08, dave wrote:
I'd like to replace all the lamps/bulb in house with LED ones (mains bayonett fittings). I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? I'd just like to ask if someone can recommend a site to buy such lamps from? My 'friends' google and ebay has zillions, but don't want to end up with a stack of fakes. A bit cynical but it adds up to quite a sum to change them all. Seen a few comments saying Lidl/Aldi LED lamps are good value and quality.Thanks for any info on this. OT: Afaik the LED lamps really are LED arrays - so I guess there is some arsenic toxicity risk in disposal? (Minute amounts). And CFL's have Hg. Just mention this because Sains.s lamp recycling bin is always crammed full of CFL's - many are smashed! I have done the same as you using HomeBargains bulbs at £2.49 each. They have them in 2 versions, cold or warm (or similar), and pretty much every possible fitting. |
LED lamps, source and value
On 20/01/2017 14:44, Brian Gaff wrote:
I don't like halogen. gives me a headache even though I cannot see. I get this spreading green yellow flashing haze when I go near Halogen lighting. Goes to prove I guess that even blind eyes can give strange effects. Brian The only difference between halogen and tungsten lights is the temperature they run at. Are you getting so close they burn? |
LED lamps, source and value
On Friday, 20 January 2017 14:41:19 UTC, Brian Gaff wrote:
Have you also checked to see what interference they can chuck out. some are terrible, one assumes the dreaded switch mode psu. Are you saying those ones brought don't conform to EU regulations ? |
LED lamps, source and value
On Friday, 20 January 2017 14:44:08 UTC, Brian Gaff wrote:
I don't like halogen. gives me a headache even though I cannot see. I get this spreading green yellow flashing haze when I go near Halogen lighting.. Goes to prove I guess that even blind eyes can give strange effects. Brian Have you found out why, as our brains tell use what we think we see rather than what is there, so something in your brain is causing this rather than your eyes I would have thought. I wonder what sot of light halagen give out that no other light source including the sun gives out. Interesting I think you need to be tied to a chair and experimnted on by shining differnt sorts of lights at you :-) |
LED lamps, source and value
On 20/01/2017 15:34, whisky-dave wrote:
On Friday, 20 January 2017 14:41:19 UTC, Brian Gaff wrote: Have you also checked to see what interference they can chuck out. some are terrible, one assumes the dreaded switch mode psu. Are you saying those ones brought don't conform to EU regulations ? If you are into short wave radio then some of the dodgier Chinese imports may lack the suppression capacitors but a properly designed switched mode PSU has no reason to be electrically noisy. -- Regards, Martin Brown |
LED lamps, source and value
On 20/01/2017 13:08, dave wrote:
I'd like to replace all the lamps/bulb in house with LED ones (mains bayonett fittings). I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? Way too expensive. Philips branded bulbs can easily be obtained for half that price Places such as Screwfix have their own brand for around £10 for 5 (9W) Seen a few comments saying Lidl/Aldi LED lamps are good value and quality.Thanks for any info on this. Often Philips brand but only re-stocked twice a year and when they are gone they are gone. OT: Afaik the LED lamps really are LED arrays - so I guess there is some arsenic toxicity risk in disposal? (Minute amounts). And CFL's have Hg. Just mention this because Sains.s lamp recycling bin is always crammed full of CFL's - many are smashed! Don't most people dispose of these type of bulb in the household rubbish along with their used batteries? -- mailto: news {at} admac {dot] myzen {dot} co {dot} uk |
LED lamps, source and value
On 20/01/2017 13:08, dave wrote:
I'd like to replace all the lamps/bulb in house with LED ones (mains bayonett fittings). I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? Screwfix sell five for a tenner. That's a reasonable price IMO. I'm quite impressed by them, though it'll take a few years to find out if they're really good. |
LED lamps, source and value
On Fri, 20 Jan 2017 13:08:56 +0000, dave wrote:
I'd like to replace all the lamps/bulb in house with LED ones (mains bayonett fittings). I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? Morrisons have 6W, 800lm, warm white ones for £5 and, bizarrely, 15W, 1520lm for £4 (E27 only). Home bargains has some at reasonable prices, but not such a wide range as last year (in my local one at least). Screwfix do 5x9W, 800lm, warm (~2800K) or cool(er) )~4500K) B22 for £10. Also, have a look at Ledlam. Various offers and a discount on Ebay's prices for going direct. -- Peter. The gods will stay away whilst religions hold sway |
LED lamps, source and value
On 20/01/2017 15:41, whisky-dave wrote:
On Friday, 20 January 2017 14:44:08 UTC, Brian Gaff wrote: I don't like halogen. gives me a headache even though I cannot see. I get this spreading green yellow flashing haze when I go near Halogen lighting. Goes to prove I guess that even blind eyes can give strange effects. Brian Have you found out why, as our brains tell use what we think we see rather than what is there, so something in your brain is causing this rather than your eyes I would have thought. I wonder what sot of light halagen give out that no other light source including the sun gives out. There is a more intense IR component cf filament lamps as well as a slight UV component but I can't see how it could affect someone. But to first order all incandescent lamps are basically black body radiation with a characteristic temperature of 2700K, 3000K or 6000K for classic, halogen and sun respectively. The latter varying a fair amount with time of day and cloud cover. Interesting I think you need to be tied to a chair and experimnted on by shining differnt sorts of lights at you :-) That sounds cruel. -- Regards, Martin Brown |
LED lamps, source and value
On 20/01/2017 17:44, PeterC wrote:
On Fri, 20 Jan 2017 13:08:56 +0000, dave wrote: I'd like to replace all the lamps/bulb in house with LED ones (mains bayonett fittings). I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? Morrisons have 6W, 800lm, warm white ones for £5 and, bizarrely, 15W, 1520lm for £4 (E27 only). Thanks for the tip off. 1500lm E27 are perfect for the kitchen spotlights. -- Regards, Martin Brown |
LED lamps, source and value
On Fri, 20 Jan 2017 13:08:56 +0000, dave wrote:
I'd like to replace all the lamps/bulb in house with LED ones (mains bayonett fittings). I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? I'd just like to ask if someone can recommend a site to buy such lamps from? My 'friends' google and ebay has zillions, but don't want to end up with a stack of fakes. A bit cynical but it adds up to quite a sum to change them all. Seen a few comments saying Lidl/Aldi LED lamps are good value and quality.Thanks for any info on this. OT: Afaik the LED lamps really are LED arrays - so I guess there is some arsenic toxicity risk in disposal? (Minute amounts). And CFL's have Hg. Just mention this because Sains.s lamp recycling bin is always crammed full of CFL's - many are smashed! There was a recent thread about this (which I started) and which you may find it of interest. Beware of electromagnetic interference as these devices can interfere with radio, particularly DAB. It seems many do not comply with the EU Electromagnetic Compatibility (EMC) Directive and some do. I have tried both and even those that comply (Philips) still cause significant interference. Philips admit the problem but say mains voltage lamps are less prone to this than 12V. I would avoid LED Hut. They were helpful at first but now that I want to return all the (non-compliant) lamps they are not replying to emails. I think my report to Trading Standards probably got their backs up. I would ask any supplier to confirm that the lamps are EMC compliant. |
LED lamps, source and value
On Fri, 20 Jan 2017 14:09:36 +0000, Martin Brown
wrote: On 20/01/2017 13:08, dave wrote: I'd like to replace all the lamps/bulb in house with LED ones (mains bayonett fittings). I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? Not even close. You should be able to get 15W ones for that price. eg https://www.amazon.co.uk/Philips-Bay...dp/B01KHIMDS6/ Or 2 packs of 8W ones. https://www.amazon.co.uk/Philips-Bay...dp/B01KHILBV6/ Plenty of other brands are OK too. Dimmable ones are more expensive. I'd just like to ask if someone can recommend a site to buy such lamps from? My 'friends' google and ebay has zillions, but don't want to end up with a stack of fakes. A bit cynical but it adds up to quite a sum to change them all. Seen a few comments saying Lidl/Aldi LED lamps are good value and quality.Thanks for any info on this. Amazon have plenty of genuine ones. I have bought some specialist LED bulbs direct from China on eBay and they were OK too - at least for what I wanted them for. I suspect exposed bare LEDs isn't ideal if you are putting them where small fingers might touch them. When you say 'genuine' did you receive assurance that they are EMC complaint? |
LED lamps, source and value
On Fri, 20 Jan 2017 15:26:48 +0000, dennis@home
wrote: On 20/01/2017 14:44, Brian Gaff wrote: I don't like halogen. gives me a headache even though I cannot see. I get this spreading green yellow flashing haze when I go near Halogen lighting. Goes to prove I guess that even blind eyes can give strange effects. Brian The only difference between halogen and tungsten lights is the temperature they run at. Surely the temperature directly influences the frequency of the light output? |
LED lamps, source and value
On Fri, 20 Jan 2017 07:34:09 -0800 (PST), whisky-dave
wrote: On Friday, 20 January 2017 14:41:19 UTC, Brian Gaff wrote: Have you also checked to see what interference they can chuck out. some are terrible, one assumes the dreaded switch mode psu. Are you saying those ones brought don't conform to EU regulations ? The ones I bought don't and the seller said they do not require to. I am now in dispute over refund. |
LED lamps, source and value
On Fri, 20 Jan 2017 15:42:42 +0000, Martin Brown
wrote: On 20/01/2017 15:34, whisky-dave wrote: On Friday, 20 January 2017 14:41:19 UTC, Brian Gaff wrote: Have you also checked to see what interference they can chuck out. some are terrible, one assumes the dreaded switch mode psu. Are you saying those ones brought don't conform to EU regulations ? If you are into short wave radio then some of the dodgier Chinese imports may lack the suppression capacitors but a properly designed switched mode PSU has no reason to be electrically noisy. As I said earlier Philips EMC complaint bulbs (12V) significantly intefere with my DAB radio. There may be 'no reason' but never let the facts get in the way of a good story. |
LED lamps, source and value
On Fri, 20 Jan 2017 16:00:03 +0000, alan_m
wrote: On 20/01/2017 13:08, dave wrote: I'd like to replace all the lamps/bulb in house with LED ones (mains bayonett fittings). I bought a couple the other day from Tesco £7 each - and I like the colour - and the power saving :-) Is that price a reasonable one for 8W LED lamp? Way too expensive. Philips branded bulbs can easily be obtained for half that price Places such as Screwfix have their own brand for around £10 for 5 (9W) Seen a few comments saying Lidl/Aldi LED lamps are good value and quality.Thanks for any info on this. Often Philips brand but only re-stocked twice a year and when they are gone they are gone. OT: Afaik the LED lamps really are LED arrays - so I guess there is some arsenic toxicity risk in disposal? (Minute amounts). And CFL's have Hg. Just mention this because Sains.s lamp recycling bin is always crammed full of CFL's - many are smashed! Don't most people dispose of these type of bulb in the household rubbish along with their used batteries? And your point is, caller? |
LED lamps, source and value
On Fri, 20 Jan 2017 19:35:04 +0000, Scott
wrote: [snip] There was a recent thread about this (which I started) and which you may find it of interest. PS I should have said it is to be found in uk.tech.digital-tv. |
LED lamps, source and value
On 20/01/2017 19:38, Scott wrote:
On Fri, 20 Jan 2017 15:26:48 +0000, dennis@home wrote: On 20/01/2017 14:44, Brian Gaff wrote: I don't like halogen. gives me a headache even though I cannot see. I get this spreading green yellow flashing haze when I go near Halogen lighting. Goes to prove I guess that even blind eyes can give strange effects. Brian The only difference between halogen and tungsten lights is the temperature they run at. Surely the temperature directly influences the frequency of the light output? It moves the peak of the curve slightly to the blue. It doesn't make them emit any visible light that wasn't already visible. |
LED lamps, source and value
On Fri, 20 Jan 2017 19:45:17 +0000, dennis@home
wrote: On 20/01/2017 19:38, Scott wrote: On Fri, 20 Jan 2017 15:26:48 +0000, dennis@home wrote: On 20/01/2017 14:44, Brian Gaff wrote: I don't like halogen. gives me a headache even though I cannot see. I get this spreading green yellow flashing haze when I go near Halogen lighting. Goes to prove I guess that even blind eyes can give strange effects. Brian The only difference between halogen and tungsten lights is the temperature they run at. Surely the temperature directly influences the frequency of the light output? It moves the peak of the curve slightly to the blue. It doesn't make them emit any visible light that wasn't already visible. 'Visible' is a not entirely relevant concept for someone who is blind. If Brian is experiencing headaches with these particular lights could it not be related to the colour temperature. |
LED lamps, source and value
Scott wrote:
Amazon have plenty of genuine ones. I have bought some specialist LED bulbs direct from China on eBay and they were OK too - at least for what I wanted them for. I suspect exposed bare LEDs isn't ideal if you are putting them where small fingers might touch them. When you say 'genuine' did you receive assurance that they are EMC complaint? Well, one might complain about them I suppose but if they are compliant you won't have a leg to stand on. -- Chris Green · |
LED lamps, source and value
Scott wrote:
On Fri, 20 Jan 2017 15:42:42 +0000, Martin Brown wrote: On 20/01/2017 15:34, whisky-dave wrote: On Friday, 20 January 2017 14:41:19 UTC, Brian Gaff wrote: Have you also checked to see what interference they can chuck out. some are terrible, one assumes the dreaded switch mode psu. Are you saying those ones brought don't conform to EU regulations ? If you are into short wave radio then some of the dodgier Chinese imports may lack the suppression capacitors but a properly designed switched mode PSU has no reason to be electrically noisy. As I said earlier Philips EMC complaint bulbs (12V) significantly Again! :-) intefere with my DAB radio. There may be 'no reason' but never let the facts get in the way of a good story. -- Chris Green · |
LED lamps, source and value
On Fri, 20 Jan 2017 20:11:03 +0000, Chris Green wrote:
Scott wrote: Amazon have plenty of genuine ones. I have bought some specialist LED bulbs direct from China on eBay and they were OK too - at least for what I wanted them for. I suspect exposed bare LEDs isn't ideal if you are putting them where small fingers might touch them. When you say 'genuine' did you receive assurance that they are EMC complaint? Well, one might complain about them I suppose but if they are compliant you won't have a leg to stand on. Very observant. I cannot even blame it on spellchecker in Usenet - the human version of spellchecker I suppose. The reason I ask is that I bought some that carried CE marking (which I assumed to be genuine) and was told by the supplier they are not EMC COMPLIANT. |
LED lamps, source and value
On Fri, 20 Jan 2017 20:11:36 +0000, Chris Green wrote:
Scott wrote: On Fri, 20 Jan 2017 15:42:42 +0000, Martin Brown wrote: On 20/01/2017 15:34, whisky-dave wrote: On Friday, 20 January 2017 14:41:19 UTC, Brian Gaff wrote: Have you also checked to see what interference they can chuck out. some are terrible, one assumes the dreaded switch mode psu. Are you saying those ones brought don't conform to EU regulations ? If you are into short wave radio then some of the dodgier Chinese imports may lack the suppression capacitors but a properly designed switched mode PSU has no reason to be electrically noisy. As I said earlier Philips EMC complaint bulbs (12V) significantly Again! :-) I was quoting myself this time :-) |
LED lamps, source and value
On 20/01/2017 19:48, Scott wrote:
On Fri, 20 Jan 2017 19:45:17 +0000, dennis@home wrote: On 20/01/2017 19:38, Scott wrote: On Fri, 20 Jan 2017 15:26:48 +0000, dennis@home wrote: On 20/01/2017 14:44, Brian Gaff wrote: I don't like halogen. gives me a headache even though I cannot see. I get this spreading green yellow flashing haze when I go near Halogen lighting. Goes to prove I guess that even blind eyes can give strange effects. Brian The only difference between halogen and tungsten lights is the temperature they run at. Surely the temperature directly influences the frequency of the light output? It moves the peak of the curve slightly to the blue. It doesn't make them emit any visible light that wasn't already visible. 'Visible' is a not entirely relevant concept for someone who is blind. If Brian is experiencing headaches with these particular lights could it not be related to the colour temperature. I can't see why it should be. The outlier is the conventional filament bulb. Halogen light is slightly *more* like natural sunlight. You could get blue coated filament bulbs to fakte 6000K daylight for photography in the old days. Before modern auto white balance digital cameras film was very tetchy about colour temperature with fluorescents being a green cast disaster. -- Regards, Martin Brown |
LED lamps, source and value
In article ,
Martin Brown wrote: Before modern auto white balance digital cameras film was very tetchy about colour temperature with fluorescents being a green cast disaster. There are fluorescent tubes designed specifically for photography, etc. In exactly the same way as there were those 'blue' coated tungsten lamps designed for photography. In other words, use the wrong lighting and you'll likely get poor results. -- *HOW IS IT POSSIBLE TO HAVE A CIVIL WAR? Dave Plowman London SW To e-mail, change noise into sound. |
LED lamps, source and value
On 21/01/2017 11:11, Huge wrote:
On 2017-01-20, Scott wrote: On Fri, 20 Jan 2017 15:26:48 +0000, dennis@home wrote: On 20/01/2017 14:44, Brian Gaff wrote: I don't like halogen. gives me a headache even though I cannot see. I get this spreading green yellow flashing haze when I go near Halogen lighting. Goes to prove I guess that even blind eyes can give strange effects. Brian The only difference between halogen and tungsten lights is the temperature they run at. Surely the temperature directly influences the frequency of the light output? It's dennis. He's wrong. He's always wrong. About everything. It does not affect the frequency output in the visible bands, it just moves the peak distribution towards the blue. So you are wrong again huge. You should learn the difference between a continuous spectrum like tungsten and halogen lights and others with a line spectrum. Then you won't look like a huge ****. |
LED lamps, source and value
On 20/01/2017 14:41, Brian Gaff wrote:
Have you also checked to see what interference they can chuck out. some are terrible, one assumes the dreaded switch mode psu. Brian Most of the more recent ones seem to be capacitive dropper... |
LED lamps, source and value
On 21/01/2017 17:56, Lee wrote:
On 20/01/2017 14:41, Brian Gaff wrote: Have you also checked to see what interference they can chuck out. some are terrible, one assumes the dreaded switch mode psu. Brian Most of the more recent ones seem to be capacitive dropper... ^^^^ "some" not "most" ;) |
LED lamps, source and value
On Sat, 21 Jan 2017 18:03:03 +0000, Lee
wrote: On 21/01/2017 17:56, Lee wrote: On 20/01/2017 14:41, Brian Gaff wrote: Have you also checked to see what interference they can chuck out. some are terrible, one assumes the dreaded switch mode psu. Brian Most of the more recent ones seem to be capacitive dropper... ^^^^ "some" not "most" ;) As a matter of interest, why to the 12 Volt ones seem to be more problematic than the mains ones? |
LED lamps, source and value
On 21/01/2017 18:16, Scott wrote:
As a matter of interest, why to the 12 Volt ones seem to be more problematic than the mains ones? Current to be supplied? 10W from 220V, current to be supplied 0.045 Amps 10W from 12V, current to be supplied 0.833 Amps The low supply voltage power supply is switching high currents. The mains supply is switching low currents. -- mailto: news {at} admac {dot] myzen {do1t} co {dot} uk |
LED lamps, source and value
On Sat, 21 Jan 2017 18:33:42 +0000, alan_m
wrote: On 21/01/2017 18:16, Scott wrote: As a matter of interest, why to the 12 Volt ones seem to be more problematic than the mains ones? Current to be supplied? 10W from 220V, current to be supplied 0.045 Amps 10W from 12V, current to be supplied 0.833 Amps The low supply voltage power supply is switching high currents. The mains supply is switching low currents. That makes sense. I had not thought of that. I take it this 'switching' is what they used to call 'rectifying' when I was at school? Would it be possible to fit a rectifier to the output of the transformer then use DC bulbs? Would this solve the problem? Also, I see that the bulbs are AC or DC. Would be be possible to fit a rectifier and use the same bulbs or would the circuitry continue to cause problems? Do you envisage technical developments resolving this or has the balance shifted in favour of 230V so far as LED is concerned? |
LED lamps, source and value
On Sat, 21 Jan 2017 19:29:42 +0000, Scott
wrote: On Sat, 21 Jan 2017 18:33:42 +0000, alan_m wrote: On 21/01/2017 18:16, Scott wrote: As a matter of interest, why to the 12 Volt ones seem to be more problematic than the mains ones? Current to be supplied? 10W from 220V, current to be supplied 0.045 Amps 10W from 12V, current to be supplied 0.833 Amps The low supply voltage power supply is switching high currents. The mains supply is switching low currents. That makes sense. I had not thought of that. I take it this 'switching' is what they used to call 'rectifying' when I was at school? Would it be possible to fit a rectifier to the output of the transformer then use DC bulbs? Would this solve the problem? Also, I see that the bulbs are AC or DC. Would be be possible to fit a rectifier and use the same bulbs or would the circuitry continue to cause problems? Do you envisage technical developments resolving this or has the balance shifted in favour of 230V so far as LED is concerned? As a follow-up I see there are some EMI free bulbs advertised. I won't post links as some might then question my motives. They seem to be lower-powered and DC. |
LED lamps, source and value
On 21/01/2017 20:44, Scott wrote:
As a follow-up I see there are some EMI free bulbs advertised. I won't post links as some might then question my motives. They seem to be lower-powered and DC. Unless you are running them from a 12V DC source, say, on a boat, caravan etc. you may just be moving the problem to the external power supply you have to fit to drive the DC bulbs -- mailto: news {at} admac {dot] myzen {dot} co {dot} uk |
LED lamps, source and value
On Sat, 21 Jan 2017 19:29:42 +0000, Scott wrote:
On Sat, 21 Jan 2017 18:33:42 +0000, alan_m wrote: On 21/01/2017 18:16, Scott wrote: As a matter of interest, why to the 12 Volt ones seem to be more problematic than the mains ones? Current to be supplied? 10W from 220V, current to be supplied 0.045 Amps 10W from 12V, current to be supplied 0.833 Amps The low supply voltage power supply is switching high currents. The mains supply is switching low currents. That makes sense. I had not thought of that. I take it this 'switching' is what they used to call 'rectifying' when I was at school? No. https://en.wikipedia.org/wiki/Switch...e_power_supply -- My posts are my copyright and if @diy_forums or Home Owners' Hub wish to copy them they can pay me £1 a message. Use the BIG mirror service in the UK: http://www.mirrorservice.org *lightning surge protection* - a w_tom conductor |
LED lamps, source and value
"Scott" wrote in message ... On Fri, 20 Jan 2017 20:11:36 +0000, Chris Green wrote: Scott wrote: On Fri, 20 Jan 2017 15:42:42 +0000, Martin Brown wrote: On 20/01/2017 15:34, whisky-dave wrote: On Friday, 20 January 2017 14:41:19 UTC, Brian Gaff wrote: Have you also checked to see what interference they can chuck out. some are terrible, one assumes the dreaded switch mode psu. Are you saying those ones brought don't conform to EU regulations ? If you are into short wave radio then some of the dodgier Chinese imports may lack the suppression capacitors but a properly designed switched mode PSU has no reason to be electrically noisy. As I said earlier Philips EMC complaint bulbs (12V) significantly Again! :-) I was quoting myself this time :-) I like the apt way you call them complaint bulbs. -- Dave W |
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