The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.
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reference surface, <in photometric or radiometric measurements>
surface on which optical quantities are measured or specified
Note 1 to entry: This entry was numbered 845-09-49 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-1057 in CIE S 017:2011.