Luminous_flux Luminous_flux

Luminous flux - Definition and Overview
Related Words: Acute, Alight, Beaming, Blushing, Bright, Brilliant, Burning, Clear
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Luminous flux is the amount of light that falls on a unit area at unit distance from a source of one candela.

In SI units, it is measured in lumen.

SI light units

SI light units

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Quantity SI unit Symbol Notes
Luminous energy joule J
Luminous flux lumen or ( candela · steradian ) lm also called Luminous power
Luminous intensity candela cd
Luminance candela / square metre cd/m2 also called Luminosity
Illuminance lux or (lumen / square metre) lx
Luminous efficacy lumens per watt lm/w

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