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Definitions of some basic photometric quantities

Definitions of some basic photometric quantities. Radiant energy W (measured in J): total amount of radiant energy in a given context (e.g. as emitted by a light source, transmitted through a surface, collected by a detector)

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Definitions of some basic photometric quantities

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  1. Definitions of some basic photometric quantities • Radiant energy W (measured in J): total amount of radiant energy in a given context (e.g. as emitted by a light source, transmitted through a surface, collected by a detector) • Radiant power P or radiant flux (measured in W): radiant energy per unit time • Radiant energy density  (measured in J·m-3): radiant energy per unit volume • Consider surface element dA of a light source. • Radiance L (measured in W·m-2·sr-1): power emitted per unit surface into solid angle d around  against surface normal dP = L()·dA·d • Spectral radiant energy W(), power P(), energy density  ():amounts of W, P, , L in frequency interval d around frequency . Pay attention to the units!!! • Irradiance or intensity I (measured in W·m-2): radiant flux per unit area

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