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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