Q. 7

A light source emits monochromatic light of wavelength 555 nm. The source consumes 100 W of electric power and emits 35 W of radiant flux. Calculate the overall luminous efficiency.

Answer :


Wavelength of light, λ= 555 nm
Radiant flux emitted = 35 W
Power input = 100 W

So, the overall luminous efficiency will be 240 lumen/W.

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