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LED lamps, source and value
On Saturday, 21 January 2017 19:29:43 UTC, 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 Would it be possible to fit a rectifier to the output of the transformer then use DC bulbs? of course Would this solve the problem? no 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? The problem is not technical, it's penny pinching. NT |
LED lamps, source and value
On Sat, 21 Jan 2017 21:44:35 +0000, alan_m
wrote: 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 Thanks, but the power supply is okay. I have three toroidal transformers presently used with the halogen lamps and they do not cause interference problems. The problem would be converting to DC and I wonder if this could be done without using these switched mode devices (that I still need to read up about). |
LED lamps, source and value
On 21 Jan 2017 22:46:27 GMT, Bob Eager wrote:
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 Thanks. I don't follow it all but I am getting the idea. I will Google linear regulators later. |
LED lamps, source and value
On Sat, 21 Jan 2017 23:35:16 -0800 (PST), wrote:
[snip] Would this solve the problem? no Would it solve the problem if I used a different type of device rather that switched mode? I am beginning to think I should stick with halogen and make equivalent energy savings elsewhere, in the same way that organisations offset carbon by planting trees instead of by cutting energy use. |
LED lamps, source and value
On Sunday, 22 January 2017 10:21:58 UTC, Scott wrote:
On Sat, 21 Jan 2017 23:35:16 -0800 (PST), tabbypurr wrote: [snip] Would this solve the problem? no Would it solve the problem if I used a different type of device rather that switched mode? Device? I don't know what you mean. Maybe unsnip some. I am beginning to think I should stick with halogen and make equivalent energy savings elsewhere, in the same way that organisations offset carbon by planting trees instead of by cutting energy use. Halogen is just a crap option for indoors. Some people love them of course, but then some people drive Trabants. NT |
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! FWIW, I've put about 10 Poundstretcher 3W LED bayonet bulbs around the house (branded Muller Light, or something like that, £1 each) in often-on locations over the past year. No problems so far. -- Cheers, Rob |
LED lamps, source and value
On Sun, 22 Jan 2017 02:52:46 -0800 (PST), wrote:
On Sunday, 22 January 2017 10:21:58 UTC, Scott wrote: On Sat, 21 Jan 2017 23:35:16 -0800 (PST), tabbypurr wrote: [snip] Would this solve the problem? no Would it solve the problem if I used a different type of device rather that switched mode? Device? I don't know what you mean. Maybe unsnip some. If you followed the rest of the thread, you would have seen the link Bob helpfully posted: https://en.wikipedia.org/wiki/Switch...e_power_supply I was thinking of what is described there as a linear power supply. I am beginning to think I should stick with halogen and make equivalent energy savings elsewhere, in the same way that organisations offset carbon by planting trees instead of by cutting energy use. Halogen is just a crap option for indoors. Some people love them of course, but then some people drive Trabants. Very insightful. It's for the kitchen not the toilet though. What lighting would you actually recommend for a kitchen and for what reasons? |
LED lamps, source and value
On Sun, 22 Jan 2017 10:56:19 +0000, RJH 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? 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! FWIW, I've put about 10 Poundstretcher 3W LED bayonet bulbs around the house (branded Muller Light, or something like that, £1 each) in often-on locations over the past year. No problems so far. In the interests of science, could you hold a DAB radio close to one of these bulbs and let us know whether it causes RF interference. |
LED lamps, source and value
In article ,
says... I'd like to replace all the lamps/bulb in house with LED ones (mains bayonett fittings). Poundland sell both 3W and 5W LED bulbs - for a pound, obviously - with a variety of bases including BC. I've used the 3W version in bedside lights and they are fine -- Terry |
LED lamps, source and value
On Sun, 22 Jan 2017 13:31:29 -0000, Terry Casey
wrote: In article , says... I'd like to replace all the lamps/bulb in house with LED ones (mains bayonett fittings). Poundland sell both 3W and 5W LED bulbs - for a pound, obviously - with a variety of bases including BC. I've used the 3W version in bedside lights and they are fine As with RJH could you do me a favour and place a DAB radio nearby to see if there is any interference? |
LED lamps, source and value
On 22/01/2017 12:04, Scott wrote:
On Sun, 22 Jan 2017 10:56:19 +0000, RJH wrote: In the interests of science, could you hold a DAB radio close to one of these bulbs and let us know whether it causes RF interference. It possibly wouldn't be of too much use to you. Pound shop products such as this tend to change on a monthly basis. What you buy today will be supplied by another manufacturer next month and that is likely to have different electronics. If you look at some of the LED bulb tear downs on Youtube you will find that the electronics in pound shop LED products range from very good to absolute crap. Often the worst compromises or bad designs are in the smaller bulbs such as the small down-light halogen replacements - there is not a lot of room inside the casing. -- mailto: news {at} admac {dot] myzen {dot} co {dot} uk |
LED lamps, source and value
On Sunday, 22 January 2017 12:03:22 UTC, Scott wrote:
On Sun, 22 Jan 2017 02:52:46 -0800 (PST), tabbypurr wrote: On Sunday, 22 January 2017 10:21:58 UTC, Scott wrote: On Sat, 21 Jan 2017 23:35:16 -0800 (PST), tabbypurr wrote: [snip] Would this solve the problem? no Would it solve the problem if I used a different type of device rather that switched mode? Device? I don't know what you mean. Maybe unsnip some. If you followed the rest of the thread, I did you would have seen the link Bob helpfully posted: https://en.wikipedia.org/wiki/Switch...e_power_supply I was thinking of what is described there as a linear power supply. You can always power LEDs with a linear supply, if suitably designed, but it's not as efficient. I am beginning to think I should stick with halogen and make equivalent energy savings elsewhere, in the same way that organisations offset carbon by planting trees instead of by cutting energy use. Halogen is just a crap option for indoors. Some people love them of course, but then some people drive Trabants. Very insightful. It's for the kitchen not the toilet though. What lighting would you actually recommend for a kitchen and for what reasons? Linear fluorescent used to be a fairly good option if done properly, not some ugly bare switchstart fitting on the ceiling. Now LED strips are better as they're more controllable, lower cost, less of a pain to get & stock. Both are diffuse light sources, giving clearer vision, especially useful in a kitchen. NT |
LED lamps, source and value
On Sun, 22 Jan 2017 14:08:57 +0000, alan_m
wrote: On 22/01/2017 12:04, Scott wrote: On Sun, 22 Jan 2017 10:56:19 +0000, RJH wrote: In the interests of science, could you hold a DAB radio close to one of these bulbs and let us know whether it causes RF interference. It possibly wouldn't be of too much use to you. I am trying to find out whether it is possible to construct a bulb that does not cause RF interference. Your explanation admits this possibility. Pound shop products such as this tend to change on a monthly basis. What you buy today will be supplied by another manufacturer next month and that is likely to have different electronics. If you look at some of the LED bulb tear downs on Youtube you will find that the electronics in pound shop LED products range from very good to absolute crap. Often the worst compromises or bad designs are in the smaller bulbs such as the small down-light halogen replacements - there is not a lot of room inside the casing. |
LED lamps, source and value
In article ,
wrote: Linear fluorescent used to be a fairly good option if done properly, not some ugly bare switchstart fitting on the ceiling. Now LED strips are better as they're more controllable, lower cost, less of a pain to get & stock. Both are diffuse light sources, giving clearer vision, especially useful in a kitchen. I'm not convinced LEDs are as easy to look at directly as a fluorescent tube. -- *What do you call a dinosaur with an extensive vocabulary? A thesaurus.* Dave Plowman London SW To e-mail, change noise into sound. |
LED lamps, source and value
In article ,
Scott wrote: You can always power LEDs with a linear supply, if suitably designed, but it's not as efficient. I'm not sure you are following the thread. If you were, you would know the question is whether it would cause RF interference. LEDs themselves don't cause any interference. It is the power supply that does if this happens. And a SMPS is far more likely to generate RF than a linear type. -- *I speak fluent patriarchy but it's not my mother tongue Dave Plowman London SW To e-mail, change noise into sound. |
LED lamps, source and value
On Sun, 22 Jan 2017 15:09:21 +0000 (GMT), "Dave Plowman (News)"
wrote: In article , Scott wrote: You can always power LEDs with a linear supply, if suitably designed, but it's not as efficient. I'm not sure you are following the thread. If you were, you would know the question is whether it would cause RF interference. LEDs themselves don't cause any interference. It is the power supply that does if this happens. And a SMPS is far more likely to generate RF than a linear type. Thanks very much. This may be an option for me to look at. |
LED lamps, source and value
On 22/01/2017 12:04, Scott wrote:
On Sun, 22 Jan 2017 10:56:19 +0000, RJH 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? 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! FWIW, I've put about 10 Poundstretcher 3W LED bayonet bulbs around the house (branded Muller Light, or something like that, £1 each) in often-on locations over the past year. No problems so far. In the interests of science, could you hold a DAB radio close to one of these bulbs and let us know whether it causes RF interference. Nothing noticeable, holding a portable radio close to most of the bulbs on DAB or FM. -- Cheers, Rob |
LED lamps, source and value
On Friday, 20 January 2017 17:50:30 UTC, Martin Brown wrote:
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. Some people are more suseptable to certain things than others from UV for sunburn to epileptic fits, soem are colour blind some see colours in sound. Soem peolpe use SAD lighting. 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. yes siun rises (I see them in photos) and sunsets have quite differnt lighting. 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. But useful if yuo want to find out why something happens. It doesn;t have to be cruel unless you want quick results. ;-) -- Regards, Martin Brown |
LED lamps, source and value
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LED lamps, source and value
On 21/01/2017 18:16, Scott wrote:
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? The 12v ones tend to be powered by a toroidal transformer expecting to drive a lot more current into the original quartz halogen lamp fittings. Halogen lamps require a substantial current and run mad hot so the fittings are designed to insulate the ceiling from the very hot lamp. This is almost a perfect storm for an LED bulb PSU. No way to convect away hot air and a PSU that is over voltage due to an out of spec load. They should be able to cope with the higher voltage within reason but they cannot cope with having a running temperature much above 95C without significantly shortening their lifetime. -- Regards, Martin Brown |
LED lamps, source and value
On Sunday, 22 January 2017 14:42:37 UTC, Scott wrote:
On Sun, 22 Jan 2017 06:34:45 -0800 (PST), tabbypurr wrote: On Sunday, 22 January 2017 12:03:22 UTC, Scott wrote: On Sun, 22 Jan 2017 02:52:46 -0800 (PST), tabbypurr wrote: On Sunday, 22 January 2017 10:21:58 UTC, Scott wrote: On Sat, 21 Jan 2017 23:35:16 -0800 (PST), tabbypurr wrote: [snip] Would this solve the problem? no Would it solve the problem if I used a different type of device rather that switched mode? Device? I don't know what you mean. Maybe unsnip some. If you followed the rest of the thread, I did you would have seen the link Bob helpfully posted: https://en.wikipedia.org/wiki/Switch...e_power_supply I was thinking of what is described there as a linear power supply. You can always power LEDs with a linear supply, if suitably designed, but it's not as efficient. I'm not sure you are following the thread. I am. I assumed you had more knowledge of linear supplies than you do. If you were, you would know the question is whether it would cause RF interference. Linear supplies don't normally produce rfi, though it is possible, seldom, for them to. But as I pointed out, no-one uses them for efficiency reasons. CR PSU LEDs have way less RFI than SMPSU types. NT |
LED lamps, source and value
On Sunday, 22 January 2017 15:11:57 UTC, Dave Plowman (News) wrote:
In article , tabbypurr wrote: Linear fluorescent used to be a fairly good option if done properly, not some ugly bare switchstart fitting on the ceiling. Now LED strips are better as they're more controllable, lower cost, less of a pain to get & stock. Both are diffuse light sources, giving clearer vision, especially useful in a kitchen. I'm not convinced LEDs are as easy to look at directly as a fluorescent tube. In decently designed lighting the bare lamps are not directly visible. NT |
LED lamps, source and value
On Mon, 23 Jan 2017 13:11:46 +0000, Martin Brown
wrote: On 21/01/2017 18:16, Scott wrote: 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? The 12v ones tend to be powered by a toroidal transformer expecting to drive a lot more current into the original quartz halogen lamp fittings. That is the position with mine. I was told (rightly or wrongly) that there is no minimum load for a toroidal transformer. You seem to be suggesting that the voltage can increase, but I thought these lamps could cope with up to 24 volts anyway. Halogen lamps require a substantial current and run mad hot so the fittings are designed to insulate the ceiling from the very hot lamp. In my case the lamps are on a track so I don't think they are particularly thermally insulated. There is plenty of air surrounding. This is almost a perfect storm for an LED bulb PSU. No way to convect away hot air and a PSU that is over voltage due to an out of spec load. They should be able to cope with the higher voltage within reason but they cannot cope with having a running temperature much above 95C without significantly shortening their lifetime. Does this cause RF interference or simply a problem with lifespan? Think I'll go back to halogen lamps and make energy savings in some other way (or maybe plant a tree as carbon offset). . |
LED lamps, source and value
On 22/01/2017 12:03, Scott wrote:
On Sun, 22 Jan 2017 02:52:46 -0800 (PST), wrote: On Sunday, 22 January 2017 10:21:58 UTC, Scott wrote: On Sat, 21 Jan 2017 23:35:16 -0800 (PST), tabbypurr wrote: [snip] Would this solve the problem? no Would it solve the problem if I used a different type of device rather that switched mode? Device? I don't know what you mean. Maybe unsnip some. If you followed the rest of the thread, you would have seen the link Bob helpfully posted: https://en.wikipedia.org/wiki/Switch...e_power_supply I was thinking of what is described there as a linear power supply. Unfortunately you have used a phrase here that also has a distinct engineering meaning namely a previous power supply technology that used to work by having a big chunk of iron transformer rectifying it and then having a voltage regulator that dissipated the excess unwanted voltage as heat to leave a nice smooth output at high current. Switched mode PSU is the exact antithesis of linear PSU. Being highly efficient at turning low current high voltage into high current low voltage with a minimum of weight and heat. In addition because LED devices are current driven the PSU used with them is by a regulated current source rather than a voltage. Halogen is just a crap option for indoors. Some people love them of course, but then some people drive Trabants. Very insightful. It's for the kitchen not the toilet though. What lighting would you actually recommend for a kitchen and for what reasons? I find a mixture of LED and LED spotlamps in classic spotlamp fixtures works OK. The design allows enough airflow to allow them to stay cool. -- Regards, Martin Brown |
LED lamps, source and value
On 23/01/2017 21:33, Scott wrote:
On Mon, 23 Jan 2017 13:11:46 +0000, Martin Brown wrote: On 21/01/2017 18:16, Scott wrote: 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? The 12v ones tend to be powered by a toroidal transformer expecting to drive a lot more current into the original quartz halogen lamp fittings. That is the position with mine. I was told (rightly or wrongly) that there is no minimum load for a toroidal transformer. You seem to be suggesting that the voltage can increase, but I thought these lamps could cope with up to 24 volts anyway. The transformer is quite happy with the load it is just that it outputs somewhat more than its nominal voltage when it is so weakly loaded since it is designed to deliver a fairly high current output at 12v. Halogen lamps require a substantial current and run mad hot so the fittings are designed to insulate the ceiling from the very hot lamp. In my case the lamps are on a track so I don't think they are particularly thermally insulated. There is plenty of air surrounding. It is the ones built into the ceiling fittings that fail very often. This is almost a perfect storm for an LED bulb PSU. No way to convect away hot air and a PSU that is over voltage due to an out of spec load. They should be able to cope with the higher voltage within reason but they cannot cope with having a running temperature much above 95C without significantly shortening their lifetime. Does this cause RF interference or simply a problem with lifespan? Cooks the capacitors. I have yet to see significant RF interference off any that I have bought even somewhat dodgy Chinese ones. I have largely given up on DAB radio though - internet streaming works a lot better. Think I'll go back to halogen lamps and make energy savings in some other way (or maybe plant a tree as carbon offset). . -- Regards, Martin Brown |
LED lamps, source and value
In article ,
wrote: On Sunday, 22 January 2017 15:11:57 UTC, Dave Plowman (News) wrote: In article , tabbypurr wrote: Linear fluorescent used to be a fairly good option if done properly, not some ugly bare switchstart fitting on the ceiling. Now LED strips are better as they're more controllable, lower cost, less of a pain to get & stock. Both are diffuse light sources, giving clearer vision, especially useful in a kitchen. I'm not convinced LEDs are as easy to look at directly as a fluorescent tube. In decently designed lighting the bare lamps are not directly visible. Any cover over the light source is going to reduce the light it produces. It's quite common to have exposed fluorescent tubes in places where it is simply working light. Once you decide that what the fitting looks like - and the quality of the light it produces - LEDs are often not the best answer. Yet. -- *If you tell the truth, you don't have to remember anything.* Dave Plowman London SW To e-mail, change noise into sound. |
LED lamps, source and value
On Tuesday, 24 January 2017 11:13:33 UTC, Dave Plowman (News) wrote:
In article , tabbypurr wrote: On Sunday, 22 January 2017 15:11:57 UTC, Dave Plowman (News) wrote: In article , tabbypurr wrote: Linear fluorescent used to be a fairly good option if done properly, not some ugly bare switchstart fitting on the ceiling. Now LED strips are better as they're more controllable, lower cost, less of a pain to get & stock. Both are diffuse light sources, giving clearer vision, especially useful in a kitchen. I'm not convinced LEDs are as easy to look at directly as a fluorescent tube. In decently designed lighting the bare lamps are not directly visible. Any cover over the light source is going to reduce the light it produces. It's quite common to have exposed fluorescent tubes in places where it is simply working light. Most people know no different. Concealed fluorescents can make genuinely good lighting. Once you decide that what the fitting looks like - and the quality of the light it produces - LEDs are often not the best answer. Yet. They have advantages for kitchen use, under cupboard in particular. Watch the light quality, it's very variable and sometimes not the CCT claimed. NT |
LED lamps, source and value
In article ,
wrote: Any cover over the light source is going to reduce the light it produces. It's quite common to have exposed fluorescent tubes in places where it is simply working light. Most people know no different. Concealed fluorescents can make genuinely good lighting. Indeed. But aren't so efficient. Everyone seems to want LEDs because they cost less to run. If that isn't the most important thing, they aren't the only choice. Once you decide that what the fitting looks like - and the quality of the light it produces - LEDs are often not the best answer. Yet. They have advantages for kitchen use, under cupboard in particular. Watch the light quality, it's very variable and sometimes not the CCT claimed. This is the problem. Although simply using any old fluorescent tube isn't going to give the best light quality either. -- *It's a thankless job, but I've got a lot of Karma to burn off Dave Plowman London SW To e-mail, change noise into sound. |
LED lamps, source and value
On Tuesday, 24 January 2017 13:05:36 UTC, Dave Plowman (News) wrote:
In article , tabbypurr wrote: Any cover over the light source is going to reduce the light it produces. It's quite common to have exposed fluorescent tubes in places where it is simply working light. Most people know no different. Concealed fluorescents can make genuinely good lighting. Indeed. But aren't so efficient. Everyone seems to want LEDs because they cost less to run. If that isn't the most important thing, they aren't the only choice. Once you decide that what the fitting looks like - and the quality of the light it produces - LEDs are often not the best answer. Yet. They have advantages for kitchen use, under cupboard in particular. Watch the light quality, it's very variable and sometimes not the CCT claimed. This is the problem. Although simply using any old fluorescent tube isn't going to give the best light quality either. Florries are what they claim. LEDs often aren't. NT |
LED lamps, source and value
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