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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scalar illuminance
integrated luminance either on any surface from its half space, or in any point from the whole space
Note 1 to entry: The scalar illuminance is expressed in lux (lx = lm·m−2).
Note 2 to entry: This entry was numbered 17-1137 in CIE S 017:2011.