Luminous_intensity Luminous_intensity

Luminous intensity - Definition and Overview
Related Words: Abandon, Amplitude, Atrocity, Bulk, Candle

Luminous intensity is a measure of the energy emitted by a light source in a particular direction.

The SI unit of Luminous intensity is the candela (cd).

1 cd is that luminous intensity emitted by a monochromatic light source of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.

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

See also
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