density of luminous flux with respect to solid angle in a specified direction
Note 1 to entry: For practical realization of the quantity, the source is approximated by a point source.
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 3 to entry: Luminous intensity can be derived from the spectral radiant intensity distribution by
Note 4 to entry: The corresponding radiometric quantity is "radiant intensity". The corresponding quantity for photons is "photon intensity".
Note 5 to entry: The luminous intensity is expressed in candela (cd = lm·sr−1).
Note 6 to entry: This entry was numbered 845-01-31 in IEC 60050-845:1987.
Note 7 to entry: This entry was numbered 17-739 in CIE S 017:2011.