When using X-rite Color i5 to measure the color of samples, there will be several groups of data under different light sources shown on the instrument. Since the testing area is an enclosed space, will the data be different when I measure the color under different light source? How will the relative spectral power distribution of different light sources affect the color measurement? which light source should I choose?
Color coordinate of the measured sample reported by instrument depends on product of the sample spectral reflection and source spectral distribution.
Means, for different sources color coordinate could be slightly different.
The best practice is to choose a source with closest spectral distribution to source that be used in practical environment to keep color constancy.
I recommend D65, A, F2.
Illuminant D65 is a commonly used standard illuminant defined by CIE. D65 corresponds roughly to the average midday light in Western Europe / Northern Europe (comprising both direct sunlight and the light diffused by a clear sky), hence it is also called a daylight illuminant.
Illuminant A used in all applications of colorimetry involving the use of incandescent lighting, unless there are specific reasons for using a different illuminant.
Illuminant F2 is mathematical representation of commercial, wide-band fluorescent (halophosphor) lamps used in developing countries and less frequently in the USA (Cool White Fluorescent). Uses include metamerism testing. Simulates limited commercial lighting in the USA due to low initial cost but poor efficacy.
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