The luminous energy emitted by a source per second is called luminous flux. It is denoted byɸ.
The unit of luminous flux is lumen. A lumen is unit energy per second. From the experiments, it has been found that 621 lumen of green light is equal to 1 watt. It should be cleared that the luminous flux is independed of radiant flux and the wavelength contained in the source of emission.
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