Explanation
It is also called luminous intensity, or light intensity for short. It is the luminous flux emitted by a light source within a unit solid angle in a given direction. The physical quantity used to indicate the intensity of luminescence within the unit solid angle in the given direction of the light source. The international unit is candela, and the symbol is cd, formerly known as candela.
Classification
Information materials -> Photosensitive and display materials -> Physical basis