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all other lamp types in blender uses a physical unit to define strength but the sun lamp has a unit less strength value.So what is the unit of the sun lamp strength if it has or if it is relative what does 1 strength mean?

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This is in the documentation:

Strength of the lights in Watts per square meter.

Though, I'm wondering if that should be kilowatts instead of watts.

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  • $\begingroup$ That's a good observation. Sun intensity on a clear day is roughly 1000 W/m^2. $\endgroup$ Commented Mar 21, 2020 at 20:22

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