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This joint ISO/CIE Standard specifies two illuminants for use in colorimetry. CIE STANDARD ILLUMINANT A represents typical, domestic, tungsten-filament lighting. Its relative spectral power distribution is that of a Planckian radiator at a temperature of approximately 2856 K. CIE standard illuminant A should be used in all applications of colorimetry involving the use of incandescent lighting, unless there are specific reasons for using a different illuminant. CIE STANDARD ILLUMINANT D65 represents average daylight and has a correlated colour temperature of approximately 6500 K. CIE standard illuminant D65 should be used in all colorimetric calculations requiring representative daylight, unless there are specific reasons for using a different illuminant.
Values for the relative spectral power distribution of CIE standard illuminants A and D65 are given in Table 1 of this International Standard, with an accuracy of six significant digits. Values are given at 1 nm intervals from 300 -830 nm. This Standard has been approved by CIE, and by ISO as a joint ISO/CIE standard.
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