Luminous efficacy - Definition and Overview

Related Words: Acute, Alight, Beaming, Blushing, Bright, Brilliant, Burning, Clear

Luminous efficacy is a measure of the proportion of the energy supplied to a lamp that is converted into light energy. It is calculated by dividing the lamp's luminous flux, measured in lumens, by the power consumption, measured in watts.

SI light units

SI light units edit (http://www.wordiq.com/definition/Template:SI_light_units)
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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