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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effective visual density
effective luminous density
logarithm to base 10 of the quotient of the luminance of the adopted white of a scene or original, 
Note 1 to entry: The effective visual density has unit one.
Note 2 to entry: This entry was numbered 17-1410 in CIE S 017:2011.