density of radiant flux with respect to solid angle in a specified direction
Note 1 to entry: The definition holds strictly only for a point source.
Note 2 to entry: The distribution of the radiant intensities as a function of the direction of emission, e.g. given by the polar angles (
Note 3 to entry: The corresponding photometric quantity is "luminous intensity". The corresponding quantity for photons is "photon intensity".
Note 4 to entry: The radiant intensity is expressed in watt per steradian (W⋅sr−1).
Note 5 to entry: This entry was numbered 845-01-30 in IEC 60050-845:1987.
Note 6 to entry: This entry was numbered 17-1026 in CIE S 017:2011.