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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

SI light units [ }\|action=edit}} Edit }]
Quantity	SI unit	Symbol	Notes
Luminous intensity	candela	cd
Luminous flux	lumen or ( candela · steradian )	lm
Luminance	candela / square metre	cd/ m²
Illuminance	lux or (lumen / square metre)	lx
Luminous efficacy	lumens per watt	lm/ w

Physical quantity Optics

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Topics: Luminous Intensity, Luminous Coefficient, Luminous (story...

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Luminous efficacy

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