
The candela per square metre (cd/m2) is the derived SI unit of luminance. The unit is based on the candela, the SI unit of luminous intensity, and the square metre, the SI unit of area. As a measure of light emitted per unit area, this unit is frequently used to specify the brightness of a display device. Most consumer desktop liquid crystal displ...
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http://en.wikipedia.org/wiki/Candela_per_square_metre

SI unit of luminance NOTE - This unit was sometimes called the nit (nt) (name discouraged). Other units of luminance : metric, non-SI : lambert non-metric : footlambert (fL) = 3.426 cd • m
-2.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-01-53
(cd/m2) A unit of luminance based on the candela, the international unit of luminous intensity, and the square metre of the area. Most consumer desktop LCDs have a luminance of 200 to 300 cd/m2.
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https://www.xrite.com/learning/other-resources/glossary
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