As a measure of light emitted per unit area, this unit is frequently used to specify the brightness of a display device. The sRGB spec for monitors targets 80 cd/m2. Typically, calibrated monitors should have a brightness of 120 cd/m2. Most consumer desktop liquid crystal displays have luminances of 200 to 300 cd/m2.High-definition televisions range from 450 to about 1500 cd/m2.
One candela per square metre is equal to:
|Name||Symbol[nb 1]||Name||Symbol||Symbol[nb 2]|
|Luminous energy||Qv [nb 3]||lumen second||lm?s||T?J||The lumen second is sometimes called the talbot.|
|Luminous flux, luminous power||?v [nb 3]||lumen (= candela steradians)||lm (= cd?sr)||J||Luminous energy per unit time|
|Luminous intensity||Iv||candela (= lumen per steradian)||cd (= lm/sr)||J||Luminous flux per unit solid angle|
|Luminance||Lv||candela per square metre||cd/m2||L-2?J||Luminous flux per unit solid angle per unit projected source area. The candela per square metre is sometimes called the nit.|
|Illuminance||Ev||lux (= lumen per square metre)||lx (= lm/m2)||L-2?J||Luminous flux incident on a surface|
|Luminous exitance, luminous emittance||Mv||lux||lx||L-2?J||Luminous flux emitted from a surface|
|Luminous exposure||Hv||lux second||lx?s||L-2?T?J||Time-integrated illuminance|
|Luminous energy density||?v||lumen second per cubic metre||lm?s?m-3||L-3?T?J|
|Luminous efficacy||? [nb 3]||lumen per watt||lm/W||M-1?L-2?T3?J||Ratio of luminous flux to radiant flux or power consumption, depending on context|
|Luminous efficiency, luminous coefficient||V||1||Luminous efficacy normalized by the maximum possible efficacy|
|See also: SI · Photometry · Radiometry|
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