The candela per square metre (cd/m2) is the derived SI unit of luminescence is also used in the LED Display industry as nits. The unit is based on the candela, the SI unit of luminous intensity, and the square meter, 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 displays have luminances of 200 to 300 cd/m2 while High-definition televisions range from 450 to about 1000 cd/m2.
Nit (nt) is a non-SI name also used for this unit (1 nt = 1 cd/m2). The term nit is believed to come from the Latin word nitere, to shine.