Article
Article
Luminance
Article By:
Koshel, R. John Photon Engineering, LLC, Tucson, Arizona.
Last reviewed:January 2020
DOI:https://doi.org/10.1036/1097-8542.391200
The luminous intensity Iν of any surface or source in a given direction per unit of projected area of the surface or source viewed from that direction. The International Commission on Illumination (abbreviated CIE, due to its French form: Commission Internationale de l'Éclairage) defines it as the quotient of the luminous intensity in the given direction of an infinitesimal element of the surface or source containing the point under consideration by the orthogonally projected area of the element on a plane perpendicular to the given direction. Simply, it is the luminous intensity per unit of projected area. Mathematically, the luminance Lν with respect to the luminous intensity is given by Eq. (1),
(1)The content above is only an excerpt.
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