IEVref:845-04-90ID:
Language:enStatus: Obsolete
Term: half-value angle (for a diffusing surface by reflection or by transmission)
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Symbol: γ
Definition: angle of observation at which the luminance has half the value of the luminance of the diffused light at the angle of 0°, with perpendicular incidence of the light

NOTE – For indicating the shape of the indicatrix of diffusion it is recommended that the diffusion factor σ be used for strongly diffusing materials, and the half-value angle γ for poorly diffusing materials.


Publication date:1987
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