Methods by which the correlated color temperature and the distribution temperature of a light source may be calculated from a knowledge of the spectral power distribution of the source are described. Digital-computer programs have been written to perform the calculations; these programs are described, with the results of some tests for a number of sources. The two temperatures are significantly different for some sources. A new concept, “daylight distribution temperature” is also introduced and some examples are given.
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Alan Robertson (1968) studied this question.
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