This document defines three CIE standard illuminants for use in colorimetry: CIE standard illuminant A for the representation of typical tungsten-filament lighting, CIE standard illuminant D65 for the representation of average daylight having a correlated colour temperature of approximately 6 500 K and CIE standard illuminant D50 for the representation of daylight with a correlated colour temperature of approximately 5 000 K. Values of the relative spectral power distribution of the three illuminants are included in this document.
EN ISO/CIE 11664-2:2022 history
2022EN ISO/CIE 11664-2:2022 Colorimetry - Part 2: CIE standard illuminants (ISO/CIE 11664-2:2022)