How can I use 5 LEDs for additive colour mixing using the CIE 1931 Chromaticity diagram?
I have the spreadsheet to do these calculations from Dr. Wendy Davis when she defined the standards at NIST for colormetrics and I know you do not have all the information on each LED correctly defined or selected. You need the full spectral density emission levels and select equal IV levels to normalize them in 4 or more colours RGBY for optimal CRI or Color Rendering Index or the preferred method of CQQ Color Quality Quotient.


It is not enough just to mix currents of RGB unless you have very loose specifications for dominant wavelength and do not care about CRI or CQQ. Yo must know the the exact specs of the light quality you wish to generate. Is it for direct viewing or object rendering by reflection. It makes a huge difference. Try reading from a monitor with a white screen and compare to a halogen lamp even dimmed to same intensity of 250Lumens /m2 or so.


*I have the spreadsheet to do these calculations from Dr. Wendy Davis when she defined the standards at NIST for colormetrics and I know you do not have all the information on each LED correctly defined or selected. You need the full spectral density emission levels and select equal Iv levels to normalize them in 4 colour RGBY or RGBW or RGBYW for optimal CRI of CCQ – Tony