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Lumen vs Illuminance - What's the difference?

lumen | illuminance |

In physics terms the difference between lumen and illuminance

is that lumen is in the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm while illuminance is the luminous flux incident on unit area of a surface; measured in lux or lumens.

lumen

English

Noun

(en-noun)
  • (physics) In the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm.
  • (anatomy) The cavity or channel within a tube or tubular organ.
  • (botany) The cavity bounded by a plant cell wall.
  • (medicine) The bore of a tube such as a hollow needle or catheter.

    • Derived terms

    * lumenal * luminal ----

    illuminance

    English

    Noun

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