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CIE Standard Illuminants

Versions of Standard Illuminants

Standard Illuminant A

Standard illuminant A is closely matched by tungsten incandescent lamps with a color temperature of 2856 K. It represents a typical situation with incandescent lighting.

Standard Illuminants B and C

Standard illuminant B approximates daylight at noon with a correlated color temperature of 4874 K. Standard illuminant C approximates average daylight with a higher color temperature of 6774 K.

Standard Illuminant D Series

Standard illuminant D series is a realistic approximation of daylight. An important version is illuminant D65 with a correlated color temperature of 6504 K.

Standard Illuminant E

Standard illuminant E has a constant spectral exitance throughout the visible spectrum. It leads to chromaticity coordinates of (1/3, 1/3) in CIE XYZ color space with a correlated color temperature of 5455 K.

Standard Illuminant F Series

Standard illuminant series F represents fluorescent lamps with various common phosphors.

Standard Illuminant LED Series

A new series of standard illuminants for LED lighting has been published in 2018, reflecting the increasing popularity of LED lighting.

More to Learn

Understanding standard illuminants is crucial in various fields, including colorimetry and lighting design. The CIE standard illuminants provide a basis for comparing and analyzing different light sources.

Source: HunterLab Support
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