Candela per square metre
The candela per square metre (symbol: cd/m) 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. The nit (symbol: nt) is a non-SI name also used for this unit (1 nt = 1 cd/m). The term "nit" is believed to come from the Latin word , "to shine". 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 . Typically, monitors calibrated for broadcast or studio color grading should have a brightness of in Japan and in the United States, or in the European Union. Most consumer desktop liquid crystal displays have luminances of 200 to 300 cd/m. HDR displays range from 450 to about 1600 cd/m. Comparison with other units of luminance. One candela per square metre is equal to: