What does "illuminance" mean?

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.

What is a synonym for "illuminance"?

Common synonyms include: illumination.

Illuminance

noun

noun ·Rare ·Advanced level

Definitions

Noun

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
the luminous flux incident on a unit area wordnet

Synonyms

All synonyms

illumination

Related phrases

luminous flux

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.