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Encyclopedia > Illuminance

Illuminance is the total luminous flux incident per unit area. It refers to the amount of incident light. Luminous flux is a measure of the energy emitted by a light source in all directions. ... This article explains the meaning of area as a physical quantity. ...


Note that the expression for the amount of light "reflected" from a surface is luminance. The word luminance, a synonym for luminosity, means emitting or reflecting light. ...


In SI derived units, it is measured in lux (lx) or candela steradian / metre squared The International System of Units (abbreviated SI from the French phrase, Système International dUnités) is the most widely used system of units. ... The lux (symbol: lx) is the SI derived unit of illuminance or illumination. ... The candela (symbol: cd, Latin for candle) is one of the seven SI base units. ... The steradian (ste from Greek stereos, solid) is the SI derived unit of solid angle, and the 3-dimensional equivalent of the radian. ... A square metre (US spelling: square meter) is by definition the area enclosed by a square with sides each 1 metre long. ...


SI light units

SI light units

edit The International System of Units (abbreviated SI from the French phrase, Système International dUnités) is the most widely used system of units. ...

Quantity SI unit Symbol Notes
Luminous energy lumen seconds lm · s lumen seconds are sometimes called Talbots
Luminous flux lumen or (candela · steradian) lm also called Luminous power
Luminous intensity candela or (lumen / steradian) cd
Luminance candela / square metre cd/m2 also called Luminosity
Illuminance lux or (lumen / square metre) lx
Luminous efficiency lumens per watt lm/W

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