Since LEDs seem to reproduce color in a different way than conventional lighting...

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Permalink Reply by Zanne N on July 10, 2009 at 9:11pm

From what I've learned, calculating CRI without the right equipment (an integrating sphere) is hard... First you need to find the color temperature and CIE coordinates. Then you have to shine the light source onto very specifically(and expensive and hard to find) colored cards and record the amount of light reflected. Normalize those numbers onto a special chart, then math happens and you get the CRI :).. I used a spectrometer to find the color temperature and CIE coordinates of my quantum dots but have not figured a way to get accurate results for CRI.. But if you have an integrating sphere I'm almost positive it can find the CRI for you... Please correct me if something is wrong but this is how I understand it..

Oh and one more thing, you can't compare CRI with two lights of different color temperatures.. A 10k light source could have a CRI of 100 and look completely different than a 3200 K light source from an incandescent (which is a 100 CRI black body radiator).. This gets into spectral power distribution...

Anyways, I think we should just aim for high CRI phosphors and such.. Nobody wants to look like they are living dead in the house..

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Permalink Reply by Alex Casteleiro on July 15, 2009 at 2:50pm

Thanks Zanne!

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