Illuminance

noun

Definitions

Noun
  1. 1
    The luminous flux incident on unit area of a surface; commonly measured in lux (lumen/metre²) or otherwise foot-candles. The illuminance of a star upon the earth is frequently measured on a negative logarithmic scale referred to as its apparent magnitude, which see. countable, uncountable
  2. 2
    the luminous flux incident on a unit area wordnet

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