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That's a very interesting project you have going ElectronGuru-you may want to start a new thread.One thing I have to ask-you keep saying that white (5000K) is the optimal color range.Humans have evolved with two light sources-the Sun and fire-both in the low 4000 range.Most members here claim better color rendering when using incans as apposed to LED's.Why are you proposing 5000K?
 
Humans have evolved with two light sources-the Sun and fire-both in the low 4000 range.
While the Sun itself, viewed through the atmosphere, may be as low as 4kK, or even lower, depending on time of day, the total solar spectrum outside the atmosphere is best matched by something between 5.5 to 6 kK. Rayleigh scattering causes the sun itself to look redder, but the blue light still shows up from the rest of the sky, so after scattering and absorption, daylight ranges from 5 to 6.5kK, nothing like "low 4000 range".
 
solar spectrum outside the atmosphere is best matched by something between 5.5 to 6 k .

I don't currently reside outside the atmosphere!!!
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Thanks for the encouragement Guys.

This is a healthy dialog. There are two challenges here:

1) There is no true-true white, measured or otherwise. What looks white to people is only white because our eyes have been looking at the sun for thousands of years. If our sun had been 1000 kelvin bluer for the last 100,000 years, 6000K would be an ideal.

2) This isn't like the boiling point of water at sea level or the atomic weight of X element. As much as we try to control this with fancy measures, it comes down to simple perception.

The spectrum I referenced above shows 5500K as center white.

This page shows 5000K as center white:
http://www.greenpassion.org/f22/light-kelvin-temperature-name-chart-3663/

This page shows 5000-5400K as center white
http://www.3drender.com/glossary/colortemp.htm


In my case, rather than basing this on incan or LED ideals, I'm trying to select a single point that can represent both with a single, common scale. In other words, look at a finished sample and say "yea, thats what my light output looks like" and know that the other samples are good predictors of what that light will look like. When I have time for more testing, I'll try several example packs calibrated to different white points. Then ask myself "which point represents what I'm seeing."

I like the idea of making a thread for this. I'll see about that when I have the methodology down. Sneak preview: I may have a way to measure and include the actual K of each light source.
 
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