The luminous flux is typically expressed in lumen(lm). The luminous flux, that is identified as a photometric quantity ,represents the light power of a source as perceived by the human eye. The luminous flux describes the quantity of light emitted by a light source. A monochromatic light source emitting an optical power of (1/683 )watt at 555 nm has a luminous flux of 1 lumen(lm).
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