Note 1 to entry: Luminous flux is a quantity derived from the radiant flux,
Note 2 to entry: The distribution of the luminous intensities as a function of the direction of emission, e.g. given by the polar angles (
Note 4 to entry: The luminous flux is expressed in lumen (lm).
Note 5 to entry: This entry was numbered 845-01-25 in IEC 60050-845:1987.
Note 6 to entry: This entry was numbered 17-738 in CIE S 017:2011.