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Pronunciation varies by accent · noun
(physics) 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..
Use illuminance when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Illuminance means (physics) 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..
Common synonyms include illumination.
The opposite depends on the specific sense.
Use illuminance where its definition matches the intended context.
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