The relative luminosity of wavelength 600 nm is 0.6. Find the radiant flux of 600 nm needed to produce
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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Relative luminousity =Luminous flux of a source of given wavelength / Luminous flux of a source of 555 nm of same power
Let the radiant flux needed be P watt.
Ao, 0.6 =Luminous flux of source 'P' watt / 685 P
Luminous flux of the source = (685 P)× 0.6 = 120 × 685
=>P =120 / 0.6
= 200W
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