Is there such a thing as lumens/m^3?Would you have to be measuring

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Lumens per cubic meter (lumens/m^3) is not a standard or meaningful unit for measuring light, as it would require assessing light from all directions simultaneously. Lumens/m^2 is a more relevant measure, focusing on perceived brightness rather than total light energy. Light that does not reach the human eye contributes zero lumens, emphasizing the importance of direct visibility. Measuring light scattered by particles in a medium, like fog, could provide a practical application for lumens/m^3. There is a query about whether there is an equivalent unit for electromagnetic energy similar to lumens/m^2, indicating a need for clarity in measuring light and energy.
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Is there such a thing as lumens/m^3?
Would you have to be measuring incoming light/energy from every (infinite) direction at the same time?
Can it be estimated or got from lumens/m^2?
 
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Not really a meaningful unit. Light that moves through space without reaching a human eye has 0 lumens. Lumens/m^2 is a measure of perceived brightness.

The closest thing to making it meaningful would be to measure the light being scattered by a fog or volume of fluid. That could be described as lumens per unit volume.
 


Aha, thanks. I think I'm confusing lumens/m^2 as a measure of electromagnetic energy. Is there an equivalent to lumens/m^2 for em energy?
 

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