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What is the difference between luminance and illuminance?

luminance | illuminance |

As nouns the difference between luminance and illuminance

is that luminance is the quality of being luminous while illuminance is the luminous flux incident on unit area of a surface; measured in lux or lumens.

luminance

English

Noun

(wikipedia luminance) (-)
  • the quality of being luminous
  • the luminous flux emitted in a given direction divided by the product of the projected area of the source element perpendicular to the direction and the solid angle containing that direction, i.e. luminous intensity divided by unit area; measured in stilbs or apostilbs

    • Synonyms

    *photometric brightness

    See also

    *brightness

    illuminance

    English

    Noun

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