LED Color Combos

[StirCrazy]

Originally Posted by ponokareefer

Cool whites are rated at 5000 to 8300, neutral whites are 3700 to 5000. Where are you going to get the 5000 to 8300 wave lengths? I'm curious why you wouldn't use neutral whites and cool whites to catch even more wave lengths?

ok, your confusing final kelvin equivalent with spectrum. I am talking spectrum. so lets look at a royal blue vs a blue. they both have a peak of about 430nm and they both have small spikes in the 430 to 520 rang also. the blue has more in the secondary range than the royal blue does so the resultant kelvin equivalent is higher.

also they don't have a range of 3700 to 5000 what they mean is some bins will have a 3700 rating, some bins will have a 4000 rating and some bins will have a 5000 rating.. other bins are different. so the bin of led is also very important.

same with the whites, a nutral white will still have wavelengths in the whole range but the amounts will be different than in the cool white. Kelvin is just the perceved color output to our eye which is a combanation of all the different wavelenghts the source emits.

go to page 5 of this PDF to see the spectral chart for the three white leds and you can see what I mean
http://www.cree.com/products/pdf/xlamp7090xr-e.pdf

Steve