change in radiant energy with time
Note 1 to entry: The corresponding photometric quantity is "luminous flux". The corresponding quantity for photons is "photon flux".
Note 2 to entry: The term "radiant flux" is the preferred term for most radiometric applications, with the notable exception of laser radiometry where the term "radiant power" is more commonly used.
Note 3 to entry: The radiant flux is expressed in watt (W).
Note 4 to entry: This entry was numbered 845-01-24 in IEC 60050-845:1987.
Note 5 to entry: This entry was numbered 17-1025 and 17-1027 in CIE S 017:2011.