CIE standard illuminants

illuminants, CIE standard

The colorimetric illuminants A, B, C and D defined by the CIE in terms of relative spectral energy (power distribution): standard illuminant A representing the full radiator at T = 2854 K; standard illuminant B representing direct sunlight with a correlated colour temperature of T = 4874 K; standard illuminant C representing daylight with a correlated colour temperature of T = 6774 K; standard illuminant D representing daylight with a correlated colour temperature of T = 6504 K (CIE). See chromaticity diagram; Macbeth lamp; white light.
References in periodicals archive ?
We used the CIE standard illuminants D65 and C, and the CIE 1931 and CIE 1964 Standard Observers (CIE 1986), to calculate different colourimetric parameters within the Munsell system and CIELAB colour space.
The NR3000 Color Difference meter makes all standard color measurements with observation conditions based on CIE standard illuminants (options include C and D65 light sources).