The rate at which light energy is emitted from a luminous source, luminous flux, Illuminance, luminous intensity, , Luminous intensity is luminous flux divided by 4π, Illuminance, luminous flux, luminous intensity, luminous flux divided by the surface area of the sphere (4πr^2)., Lumens, Illuminance, luminous intensity, The unit of Luminous intensity, lumens, Candela, Lux, The unit of Illuminance (E), Lux, Candela, Lumens, luminous flux is given the symbol _______________ and is measured in Lumens, P, E, I, X.

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