It characterizes the amount of light coming from a light source or luminaire in a specific direction. It is the quotient of the luminous flux sent by the source in an elementary solid angle containing a given direction to the value of this elementary angle.
Luminous intensity is an indicator determining the amount of light emerging from the source in a given direction.
It is the quotient of the light flux emitted by the source in a specific direction to the value of the elementary angle containing this direction.
Luminance helps determine how intense the lighting will be in a given area and in what direction it will be focused.
Luminosity is the amount of light in a given direction, while brightness is the human eye's subjective feeling of light intensity.
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