IEVref:845-21-091ID:
Language:enStatus: Standard
Term: spectral luminous efficacy, <for a specified photometric condition>
Synonym1:
Synonym2:
Synonym3:
Symbol: K(λ),<for photopic vision> <pour la vision photopique>
K′(λ), <for scotopic vision> <pour la vision scotopique>
Kmes;m(λ), <for mesopic vision> <pour la vision mésopique>
K10(λ), <for the CIE 10° photopic photometric observer> <pour l'observateur photométrique photopique 10° CIE>
KM(λ), <for the CIE 1988 modified 2° spectral luminous efficiency function for photopic vision> <pour la fonction d'efficacité lumineuse relative spectrale de 2° pour vision photopique (CIE 1988 modifiée)>
Definition: product of spectral luminous efficiency and maximum luminous efficacy for a specified photometric condition

Note 1 to entry: The photometric condition should be specified (e.g. photopic, scotopic, mesopic). If it is not specified, photopic vision is assumed and the symbol K(λ) is used. For other photometric conditions, the respective symbol for identification shall be used.

Note 2 to entry: Spectral luminous efficacy for photopic vision is expressed by

K(λ) = Km V(λ)

where Km is maximum luminous efficacy, V(λ) is spectral luminous efficiency and λ is wavelength.

Note 3 to entry: The spectral luminous efficacy is expressed in lumen per watt (lm·W−1).


Publication date:2020-12
Source
Replaces:
Internal notes:
CO remarks:
TC/SC remarks:
VT remarks:
Domain1:
Domain2:
Domain3:
Domain4:
Domain5: