Illumination introduction
Illumination can be abbreviated as illuminance, the name of the unit of measurement is "lux", or "lux" for short, and the unit symbol is "lx", which represents the luminous flux per unit area on the surface of the subject. 1 lux is equal to 1 lumen/square meter, that is, the luminous flux that is irradiated vertically by a light source with a distance of one meter and a luminous intensity of 1 candela per square meter of the subject. Illumination is an important indicator to measure the shooting environment.