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I would like to know some precise illumination values from a combination of light sources, so I am looking for a way to view the lumens values from a surface (for example a flat plane). Is there a way to do this?

Best I can do so far is:

  • Using the Raw View Transform in Color Management, using Right Click in the render window, I get values of HSL Luminance that might correspond to lumens (?)
  • Using the False Color View Transform in Color Management I can see the exposure as a heat map. Ideally I would be able to get the underlying numerical values.
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