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Term: Standard illuminant

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Term: Standard illuminant

A standard illuminant is a published spectral profile of visible light. The most commonly used and referred to standard illuminants are published by the CIE. A CIE illuminant is a spectral characterization or model that defines the amount of energy at each wavelength across the spectrum. Physical light sources listed as a particular standard illuminant are designed and manufactured to approximate that ideal characterization. CIE standard illuminants are divided into multiple categories or series. The illuminant series generally used in digitization activities is the D series (approximating daylight), with D50 and D65 being most commonly used.
Wikipedia definition
CIE Web site
X-Rite Understanding Illuminants
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