luminance

(lo̵̅o̅mə nəns)

noun

  1. the quality or state of being luminous
  2. a measure of the brightness of a luminous surface, measured in candelas per unit area

Origin: < L lumen (gen. luminis), light + -ance

See luminance in American Heritage Dictionary 4

noun
  1. The condition or quality of being luminous.
  2. Physics The intensity of light per unit area of its source.

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