![]() ![]() The spectral radiant exitance of a black body follows Planck's law: CIE, CIE Standard Illuminants for Colorimetry It is hoped that new developments in light sources and filters will eventually offer sufficient basis for a CIE recommendation. For the relatively newer ones (such as series D), experimenters are left to measure to profiles of their sources and compare them to the published spectra: Īt present no artificial source is recommended to realize CIE standard illuminant D65 or any other illuminant D of different CCT. There are instructions on how to experimentally produce light sources ("standard sources") corresponding to the older illuminants. Illuminants D represent variations of daylight, illuminant E is the equal-energy illuminant, while illuminants F represent fluorescent lamps of various composition. Illuminants A, B, and C were introduced in 1931, with the intention of respectively representing average incandescent light, direct sunlight, and average daylight. Each of these is known by a letter or by a letter-number combination. The International Commission on Illumination (usually abbreviated CIE for its French name) is the body responsible for publishing all of the well-known standard illuminants. 2.1 White points of standard illuminants.
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