View example sentences, synonyms and word forms for Illuminance.
Illuminance
Illuminance meaning
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.
Synonyms of Illuminance
Example sentences (3)
Both the PRC and the required illuminance vary from species to species and lower light levels are required to reset the clocks in nocturnal rodents than in humans.
Use of absolute aperture diameter The aperture diameter is normally given in terms of the f-number because all lenses set to the same f-number give approximately the same image illuminance (Ray 2002, 130), simplifying exposure settings.
What gets directly measured by a light meter is incident light on a sensor of finite area, i.e. illuminance in lm/m 2 (lux).