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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Kind of. Lumens are meant to be a quasi-psychometric measurement: it measures *perceived* brightness. It’s similar to watts, but is frequency-weighted to match the human eye’s sensitivity to different colors, so that it roughly correlates to what we see as brightness.
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