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Question

The relative luminosity of wavelength 600 nm is 0.6. Find the radiant flux of 600 nm needed to produce the same brightness sensation as produced by 120 W of radiant flux at 555 nm.

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Solution

Given,
Relative luminosity = 0.6
Let P be the radiant flux of the source.
∴ Luminous flux = P×685
Again, relative luminosity=Luminous flux of a source of given wavelengthLuminous flux of a source of 555 nm of same power

0.6=Luminous flux of a source P watt685 P
685×P×0.6=120×685
P=1200.6=200 W
So, 200 W radiant flux is needed to produce the same brightness sensation for 600 nm wavelength.

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