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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/SecondStudy guides

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Q: How many lumen are in 1 Joule?

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1 watt/second equal to 1 Joule

0.00027777777777778 Wh1 Wh = 3600 Joule

1 mega-anything = 1 million of them. 1 joule = 0.000001 megajoule

If you actually mean the unit of energy, Joule, then 1 Volt = 1 Joule/1 Coulomb, or 1 Joule = 1 Volt * 1 Coulomb

1 Newton is 1 joule/meter.

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