Voltage regulated G4 led

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Plevier

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Certainly a good price.

EMC emissions might be an issue; there is no mention of CE marking and the PCB tracking isn't what I'd expect from a switch mode regulator designed for low emissions. If you buy them I suggest you make sure your VHF and navigation electronics work after fitting. Given the price you're not risking a lot.

Nigel I'm curious; why do you prefer cool white to warm white?
 
JohnGC said:
Nigel I'm curious; why do you prefer cool white to warm white?
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Because I am a human, designed to make optimum use of the light from the sun, at about 6500K. It seems some people prefer lamps which mimic candles, which I find most unpleasant for doing anything other than f***ing. :)

If you have a single cool white lamp it will look blue, but if they are all cool white you don't notice.
 
nigelmercier said:
Because I am a human, designed to make optimum use of the light from the sun, at about 6500K. It seems some people prefer lamps which mimic candles, which I find most unpleasant for doing anything other than f***ing. :)

If you have a single cool white lamp it will look blue, but if they are all cool white you don't notice.
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I see where you're coming from but the sun is a wide spectrum source centered on 6500k and as a human your eyes also respond to a widish spectrum. All LEDs are almost monochromatic by comparison so you need a mixture of colour temperatures to mimic the sun.

I design electronic control systems for an architectural LED manufacturer so I get to hear the options of many white LED users. I'm interested in your opinion because it's unusual (please note I'm not saying it's wrong).
 
Joking aside I really do find the cool ones too blue, they are more like cold starlight than warm sunlight, but I agree the warm ones are duller and yellower than necessary. They seem to mimic ordinary tungsten rather than halogen. Ideally I'd like something in between.
I wonder how alternate cool and warm ones in a multi led bulb would work out? At least it wouldn't be monochromatic!
 
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JohnGC said:
I'm interested in your opinion because it's unusual (please note I'm not saying it's wrong).
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When we bought LEDs for my boat we did a test with a warm white and a cool white. All the men preferred cool, the ladies all preferred warm.

I have fitted cool white fluorescents into our kitchen at home. One blew, so I replaced it temporarily with an old warm white one. SWMBO complained it was too yellow; she was right!
 
nigelmercier said:
When we bought LEDs for my boat we did a test with a warm white and a cool white. All the men preferred cool, the ladies all preferred warm.

I have fitted cool white fluorescents into our kitchen at home. One blew, so I replaced it temporarily with an old warm white one. SWMBO complained it was too yellow; she was right!
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I'm not surprised that there is a difference between the men a women, after all 1 in 4 men have some colour blindness, with women it's 1 in 12. (The figures vary depending on which research it's based on but the differential remains.)
 
Troubadour said:
Joking aside I really do find the cool ones too blue, they are more like cold starlight than warm sunlight, but I agree the warm ones are duller and yellower than necessary. They seem to mimic ordinary tungsten rather than halogen. Ideally I'd like something in between.
I wonder how alternate cool and warm ones in a multi led bulb would work out? At least it wouldn't be monochromatic!
Click to expand...

It's also worth noting that there are many different colour temperature white LEDs. So the cool and warm descriptions will have a lot of variation in them. The LEDs in the OP are given a wide range 3000k to 3500k and if the LEDs are not from the same batch then they will look noticeably different.
 
JohnGC said:
Certainly a good price.

EMC emissions might be an issue; there is no mention of CE marking and the PCB tracking isn't what I'd expect from a switch mode regulator designed for low emissions. If you buy them I suggest you make sure your VHF and navigation electronics work after fitting. Given the price you're not risking a lot.
Click to expand...

Except I was looking for 15! Hmm. 3-4 weeks to get a test one then 3-4 weeks to get more if OK.
 
Troubadour said:
Except I was looking for 15! Hmm. 3-4 weeks to get a test one then 3-4 weeks to get more if OK.
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You could ask them if they have a CE mark for EMC. Not sure how far I'd trust the answer though.

EMC won't be an issue with them turned off, so if you don't plan to sail with them on..............
 
Troubadour said:
Joking aside I really do find the cool ones too blue, they are more like cold starlight than warm sunlight, but I agree the warm ones are duller and yellower than necessary. They seem to mimic ordinary tungsten rather than halogen. Ideally I'd like something in between.
I wonder how alternate cool and warm ones in a multi led bulb would work out? At least it wouldn't be monochromatic!
Click to expand...

I've just done that as an experiment. One warm and one cool light. When you look at the lights it's obvious but, when you look on the saloon table, it looks fine. I'm not going to say anything but I'll wait and see if SWMBO makes any comment.
 
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