Definition that contains luminous flux
- lm a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions
- illumination the luminous flux incident on a unit area
- lumen a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions
- illuminance the luminous flux incident on a unit area
- luminous flux unit a measure of luminous flux per unit area