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When creating a non-light and giving it an emission shader, what values of "Strength" are equivalent to given values of "Power" in an area light?

Not a duplicate of Understanding light power values. This isn't talking about options in lights, but options in emission shaders that aren't lights on their own.

schuelermine
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1 Answers1

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I did some testing. You can use this as a reference sheet :).

Power : Strength ratio is 10:2,5 (for 1m² area)

  • Area lights use Power (W), Mesh lights use Strength

  • Mesh light used - default plane with Emission shader

Intensity and size relationship

  • Area lights - maintain their intensity with increased size.
  • Mesh lights - increase their intensity with increased size

enter image description here

Power:Strength reference sheet

  • I tested these as 4096x4096 images and still couldn't tell the difference.
  • Sorry for the color banding and compression artifacts.
  • Noise is a tiny bit higher for Mesh lights.

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jachym michal
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