warm white or cool white for a workbench light ?

[Warhawk]

When your poll said "cool white" or "warm white".....your opinion of the colors and mind much be different.  Very subjective.

You are right. I should have added more details. I am going to update a first post. I decided to buy "day-white" - 4000-4500K

[Kjelt]

rule of thumb for indoor use:
2700K Kitchen
3000K Living Room
4000K Working Area.

[metalphreak]

4000K is the standard for office lighting and is probably what you want.

If you deal with anything with high detailed colour contrasts, you want a high CRI (Colour Rendering Index), which I would not trust any of the stated CRI values from the cheap brands.

[Kjelt]

Be carefull, the CRI was defined for halogen lamps (broad spectrum) not for LEDs (narrow spectrum) so untill they define a new standard the CRI is not much use and will only be high for those leds that use phosphor (broad spectrum).

[tszaboo]

I would not use LEDs at all for the place where I solder. It makes my eyes bleed. It is awful for that. Actually If I was about to build my own lab, I would use a 12V battery charged overnight and multiple 12V incandescent lightbulb. EMI away you go, stress away you go.

[Warhawk]

I would not use LEDs at all for the place where I solder. It makes my eyes bleed. It is awful for that. Actually If I was about to build my own lab, I would use a 12V battery charged overnight and multiple 12V incandescent lightbulb. EMI away you go, stress away you go.

Sure, I wanted to make my own power supply for LEDs because of EMI.
Then I realized - Rigol, Laptop - both have a DCDC inside.

The supply I linked here before is well specified (abnormally for this class) and I somehow feel it might be better than others.
 

[tszaboo]

I would not use LEDs at all for the place where I solder. It makes my eyes bleed. It is awful for that. Actually If I was about to build my own lab, I would use a 12V battery charged overnight and multiple 12V incandescent lightbulb. EMI away you go, stress away you go.

Sure, I wanted to make my own power supply for LEDs because of EMI.
Then I realized - Rigol, Laptop - both have a DCDC inside.

The supply I linked here before is well specified (abnormally for this class) and I somehow feel it might be better than others.
 

Sorry, I thought you wanted to measure something and have the lights on at the same time.
I hate when the scope makes false triggers. That is why I sit through all measurement (EEVblog #14 anyone?)

[Warhawk]

I would not use LEDs at all for the place where I solder. It makes my eyes bleed. It is awful for that. Actually If I was about to build my own lab, I would use a 12V battery charged overnight and multiple 12V incandescent lightbulb. EMI away you go, stress away you go.

Sure, I wanted to make my own power supply for LEDs because of EMI.
Then I realized - Rigol, Laptop - both have a DCDC inside.

The supply I linked here before is well specified (abnormally for this class) and I somehow feel it might be better than others.
 

Sorry, I thought you wanted to measure something and have the lights on at the same time.
I hate when the scope makes false triggers. That is why I sit through all measurement (EEVblog #14 anyone?)

Sorry, I did not get it :-)

I just wanted to say that my idea, making a nice and clean linear PSU for LEDs, is not worth the effort. Even if I designed and made it, I would still have other noise sources somewhere else.   

[Things]

I find 4000K to be the perfect mix between not too yellow and not too blue. It's more on the yellow side than blue, but you wouldn't really call it yellow.