[F11. DEFINITIONS U.K.
1.1. CIE standard illuminant A (1) : Colorimetric illuminant, respecting the full radiator at T 68 = 2855,6 K. U.K.
1.2. CIE standard source A (1) : Gas-filled tungsten filament lamp operating at a correlated colour temperature of T 68 = 2855,6 K. U.K.
1.3. CIE 1931 standard colorimetric observer (1) : Receptor of radiation whose colorimetric characteristics correspond to the spectral tristimulus values (λ), (λ), (λ) (see table). U.K.
1.4. CIE spectral tristimulus values (1) : Tristimulus values of the spectral components of an equi-energy spectrum in the CIE (XYZ) system. U.K.
1.5. Photopic vision (1) : Vision by the normal eye when it is adapted to levels of luminance of at least several candelas per square metre.] U.K.
Textual Amendments
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[F1Definitions taken from CIE publication 50 (45), International Electronical Vocabulary, Group 45: Lighting.]