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Wednesday, January 6, 2010

Luminance and illuminance

Luminance: Luminous flus in a beam, emanating from a surface, or falling on a surface, in a given direction, per unit of projected area of the surface as viewed from that direction, per unit solid angle (ASTM E 284)

Illuminance: Luminous flus incident per unit of area (ASTM E 284)

Luminous: Weighted according to the spectral luminous efficiency function, Vramda of the CIE (ASTM E 284)

Lumen: Luminous flus emitted within one steradian by a point source having a spatially uniform luminous intensity of 1 candela (ASTM E 284)

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