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noun, Optics.
luminous flux emitted per unit area.


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  • Luminous-energy

    noun 1. 1 (def 2a). noun 1. energy emitted or propagated in the form of light; the product of a luminous flux and its duration, measured in lumen seconds Qv

  • Luminous exitance

    noun 1. the ability of a surface to emit light expressed as the luminous flux per unit area at a specified point on the surface Mv

  • Luminous-flux

    noun, Optics. 1. the rate of transmission of luminous energy: expressed in lumens. noun 1. a measure of the rate of flow of luminous energy, evaluated according to its ability to produce a visual sensation. For a monochromatic light it is the radiant flux multiplied by the spectral luminous efficiency of the light. It is […]

  • Luminous-flux-density

    noun 1. luminous flux per unit of cross-sectional area.

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