energy emitted, transferred or received in form of electromagnetic waves
Note 1 to entry: Radiant energy can be expressed by the time integral of radiant flux,
Note 4 to entry: The radiant energy is expressed in joule (J = W·s).
Note 5 to entry: This entry was numbered 845-01-27 in IEC 60050-845:1987.
Note 6 to entry: This entry was numbered 17-1019 in CIE S 017:2011.