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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
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โˆ™ 2012-09-13 19:31:06
This answer is:
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wesam salih

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โˆ™ 2022-08-11 14:08:05
Helpful answer thanks
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Sasuntidictous Rhoir...

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โˆ™ 2022-11-27 17:00:15
1 lumen = 1 candela MULTIPLIED BY a steradian, not divided by.
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Q: How many lumen are in 1 Joule?
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