light, <psychophysical> noun
radiation that is considered from the point of view of its ability to excite the visual system
Note 1 to entry: The term "light" is sometimes used for optical radiation extending outside the visible range, but this usage is not recommended.
Note 2 to entry: This entry was numbered 845-01-06 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-659 (2.) in CIE S 017:2011.