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1 lumen = 1 candela per steradian.
1 candela = 1/683 watts per steradians (assuming 540nm light wavelength).
Assuming that the light is collected from a single steradian:
1 Lumen = 1 Candela -> = 1/683 Watt -> Watt = 683 Lumens
1 Joule = 1 Watt per Second -> Watt = Joule/Second
Hence:
683 Lumen = 1 Joule/Second
Under the above assumptions1 Lumen = 1/683 Joule/Second
683
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How many ergs equals i joule?
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How many joule equals 1 MW energy?
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How many mega joules are there in a joule?
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How many calories in a joule?
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1000
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