Luminous flux

Perceived luminous power / From Wikipedia, the free encyclopedia

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In photometry, luminous flux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power of electromagnetic radiation (including infrared, ultraviolet, and visible light), in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light.

Quick facts: Luminous flux, Common symbols, SI unit, ... ▼
Luminous flux
Common symbols
Φv
SI unitlumen
In SI base unitscd⋅sr
DimensionJ
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Luminosity.png
Photopic (black line) and scotopic [1] (green line) luminosity functions. The photopic includes the CIE 1931 standard (solid),[2] the Judd-Vos 1978 modified data (dashed),[3] and the Sharpe, Stockman, Jagla & Jägle 2005 data (dotted).[4] The horizontal axis is wavelength in nm.
Luminance_Chamber.jpg
Integrating sphere used for measuring the luminous flux of a light source.

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