They seem to be measuring basically the same thing (luminous flux is restricted to visible light), but luminous flux is measured in lumens and radiant flux is measured in Watts. Is a lumen just a fancy Watt?
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Luminous flux essentially measures photon density while radiant flux measures energy density. So a red light and a blue light with the same luminous flux would have different radiant fluxes because blue light photons carry more energy than red.
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