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illuminance

[ ih-loo-muh-nuhns ]

noun

, Optics.

illuminance

/ ɪˈluːmɪnəns /

noun

  1. See irradiance
    the luminous flux incident on unit area of a surface. It is measured in lux Ev Sometimes calledillumination Compare irradiance

illuminance

/ ĭ-lo̅o̅′mə-nəns /

  1. The luminous flux per unit area at any point on a surface exposed to incident light. It is measured in luxes.
  2. Also called illumination

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Word History and Origins

Origin of illuminance1

First recorded in 1940–45; illumin(ate) + -ance

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