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Calculate Illuminant D SPD and CIE 1931 xy from color temperature

Home /  Blog /  Tech & Color Science /  Calculate Illuminant D SPD and CIE 1931 xy from color temperature
Illuminant D can be calculated from color temperature using our online calculator. Simply input the CCT and you will be able to download the corresponding Illuminant D spectral power distribution and CIE 1931 xy chromaticity point.


Color temperature to Illuminant D SPD and CIE 1931 xy


CCT:





XY Coordinates: (0.38044,0.38284)


SPD:

-






Formula used to convert CCT to Illuminant D spectral power distribution



First, lookup the xy coordinates from CCT to reconstructed daylight.

Then, use the xy result and the following formulas for M1 and M2:

M1 = (-1.3515-1.7703*x+5.9114*y)/(0.0241+0.2562*x-0.7341*y)
M2 =(0.03-31.4424*x+30.0717*y)/(0.0241+0.2562*x-0.7341*y)

Then, for each wavelength, use the following formula to get the irradiance value:

S = S0 + S1*M1 + S2*M2