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Radiance vs Illuminance - What's the difference?

radiance | illuminance |

In physics|lang=en terms the difference between radiance and illuminance

is that radiance is (physics) the flux of radiation emitted per unit solid angle in a given direction by a unit area of a source while illuminance is (physics) the luminous flux incident on unit area of a surface; measured in lux or lumens.

As nouns the difference between radiance and illuminance

is that radiance is the quality of being radiant, shining, bright or splendid while illuminance is (physics) the luminous flux incident on unit area of a surface; measured in lux or lumens.

radiance

English

Noun

(wikipedia radiance)
  • the quality of being radiant, shining, bright or splendid
    • Girt with omnipotence, with radiance crowned. — Milton.
  • (physics) the flux of radiation emitted per unit solid angle in a given direction by a unit area of a source

    • illuminance

    English

    Noun

    (wikipedia illuminance) (en noun)
  • (physics) The luminous flux incident on unit area of a surface; measured in lux or lumens