Illuminance
Definitions
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.
CEFR level
C1
Advanced
This word is part of the CEFR C1 vocabulary — advanced level.
This word is part of the CEFR C1 vocabulary — advanced level.
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