# e-ILV

The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.

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# 17-21-041

Qe; W; U; Q

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, Φe, over a given duration, Δt:

.

Note 2 to entry: Radiant energy is expressed as a function of wavelength, λ, as a function of frequency, ν, or as a function of wavenumber, σ.

Note 3 to entry: The corresponding photometric quantity is "luminous energy". The corresponding quantity for photons is "photon energy".

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.

Publication date: 2020-12