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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
Wiki User
∙ 11y ago
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Sasuntidictous Rhoir...
There is no direct conversion between lumens and joules, as they measure different things. Lumens measure the amount of visible light emitted by a source, while joules measure energy. The relationship between the two depends on the light source's efficiency and spectral distribution.
Collins Kabwe
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