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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/SecondLvl 1

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Lvl 1

1 lumen = 1 candela MULTIPLIED BY a steradian, not divided by.

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Lvl 2

683

Q: How many lumen are in 1 Joule?

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