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brightness
attribute of a visual perception according to which an area appears to emit, transmit or reflect, more or less light
Note 1 to entry: The use of this term is not restricted to primary light sources.
Note 2 to entry: This entry was numbered 845-02-28 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-111 in CIE S 017:2011.