luminous coefficient


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luminous coefficient

[′lü·mə·nəs ‚kō·i′fish·ənt]
(optics)
A measure of the fraction of the radiant power of a light source which contributes to its luminous properties, equal to the average of the luminosity function at various wavelengths, weighted according to the spectral intensity of the source. Also known as luminous efficiency.
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With these approximations, the solar optical properties of a system can be defined in terms of its bidirectional transmittance and reflectance distribution functions [Nicodemus 1965], which are in effect a set of hemispherical luminous coefficients defined by paired incident and outgoing angles.