illuminance (English, noun)
expansion: illuminance (countable and uncountable, plural illuminances)
Senses:
topics: natural-sciences
physical-sciences
physics
glosses: 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.
tags: countable
uncountable
Forms:
form: illuminances
tags: plural