Candela per square metre calibrated monitors should have a brightness of 120 cd/m. Most consumer desktop liquid crystal displays have luminances of 200 to 300 cd/m. High-definition televisions range from 450 to about 1500 cd/m. One candela per square metre is equal to: Candela per square metre The candela per square metre (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. Nit (nt) is a non-SI name also used for this unit (1 nt = 1 cd/m). The term "nit" is believed to
Candela of 40° emits about 224 lumens. See MR16 for emission angles of some common lamps. If the source emits light uniformly in all directions, the flux can be found by multiplying the intensity by 4π: a uniform 1 candela source emits 12.6 lumens. For the purpose of measuring illumination, the candela is not a practical unit, as it only applies to idealized point light sources, each approximated by a source small compared to the distance from which its luminous radiation is measured, also assuming that it is done so in the absence of other light sources. What gets directly measured