Photometric quantities and units

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Any radiometric measure can be converted to the corresponding photometric measure by computing the effect of the stimulus defined in radiometric terms on the CIE standard observer. This is defined by the spectral luminous efficiency curve V for photopic vision.

The spectral luminous efficiency curve V for photopic vision.



For the purpose to investigating light and color, the most important photometric quantity is the luminance, because it is directly correlated with visual perception.


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