Brightness (Photometry)

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lu·mi·nance / ˈloōmənəns/ • n. Physics the intensity of light emitted from a surface per unit area in a given direction. ∎  the component of a television signal that carries information on the brightness of the image.

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luminance A measure of the intensity of electromagnetic radiation emitted by a source in a specified direction.

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luminance A measure of the light intensity reflected or emitted by a surface in a given direction per unit of apparent area. The unit of measurement is the candela per square meter.