density of exiting radiant flux with respect to area at a point on a real or imaginary surface
Note 1 to entry: For Planckian radiation,
Note 2 to entry: The corresponding photometric quantity is "luminous exitance". The corresponding photon quantity is "photon exitance".
Note 3 to entry: The radiant exitance is expressed in watt per square metre (W⋅m−2).
Note 4 to entry: This entry was numbered 845-01-47 in IEC 60050-845:1987.
Note 5 to entry: This entry was numbered 17-1020 in CIE S 017:2011.