IEVref:845-24-079ID:
Language:enStatus: Standard
Term: luminance coefficient
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Symbol: qv
q
Definition: quotient of the luminance at a surface element of a medium in a given direction and the illuminance on the medium

q v = L v E v MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadghadaWgaaWcbaGaaeODaaqabaGccqGH9aqpdaWcaaqaaiaadYea daWgaaWcbaGaaeODaaqabaaakeaacaWGfbWaaSbaaSqaaiaabAhaae qaaaaaaaa@3E44@

where Lv is luminance and Ev is illuminance

Note 1 to entry: The bi-directional reflectance distribution function (BRDF) is similar to the luminance coefficient except that it is defined for directional incident radiation.

Note 2 to entry: The luminance coefficient is expressed in steradian to the power minus one (sr−1).

Note 3 to entry: This entry was numbered 845-04-71 in IEC 60050-845:1987.


Publication date:2020-12
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