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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Lumens measure how much light is emitted, watts measure how much power is consumed. Consider a light bulb. The higher the lumens the brighter the bulb, and the higher the watts, the brighter the bulb because more power=brighter light.
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