Brightness is one of the most important characteristics of any display. The main unit of brightness for light sources is candela (cd). The brightness of individual LEDs is usually expressed in millicandelas (mcd - a thousandth of a candela). If individual LED brightness in one square meter is added together, we get the value of area brightness. It is expressed in Nits (1 Nit = 1 cd/m2 - candelas per square meter).