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luminous range
greatest distance at which a given signal light can be recognized in any particular circumstances, as limited only by the atmospheric transmissivity and by the threshold of illuminance at the eye of the observer
Note 1 to entry: This entry was numbered 845-11-28 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-740 in CIE S 017:2011.