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Lighting Glossary
Term:
Luminous Flux Density
The solid angular luminous flux density in a given direction from a light source. It may be considered as the luminous flux on a small surface normal to the given direction. 1 lux corresponds to a light flux of 1 lumen, which illuminates 1 square meter uniformly. Luminous intensity is measured by a luxmeter on horizontal and vertical surfaces. A white space appears to be lighter in the same luminous intensity than a dark space (see reflectance).
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