I evaluate llighting systems by measuring uv with a spectroradiometer. How can I calculate deltaE color difference from this data?
It is a tricky calculation, but what I would recommend is normalizing the sources to the same luminance (Y=100) and then use Illuminant D50 (with Y=100) as the CIELAB reference point (XnYnZn). Then convert your u’v’ measurements for other sources back to XYZ (scaled to Y=100) and use the test source as the stimulus (XYZ) in the CIELAB computation. You can then compute the delta-E between the reference D50 (L*=100, a*=0, b*=0) and your test source (which would be slightly different). This delta-E will be equivalent to the idea of illuminating side-by side white samples with the reference and test sources and assuming you adapt to the reference source. That is a completely valid and meaningful computation to do.
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