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illuminance

[ ih-loo-muh-nuhns ]

noun

, Optics.


illuminance

/ ɪˈluːmɪnəns /

noun

  1. the luminous flux incident on unit area of a surface. It is measured in lux Ev Sometimes calledillumination Compare irradiance
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


illuminance

/ ĭ-lo̅o̅mə-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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illuminableilluminant