I was trying to make an intuitive argument of why flux is constant under scale in some cases & not others
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so no cos weighting, which maked sense since why would you weight rel. arbitrary plane normal
because that's what "illuminance" is - it's flux per area arriving at a surface - so with cos
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cos assumes that area is plane facing up, which is not the case with lumisphere
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For use in gfx u want a measure at sth resembling differential area: lumidisc/retracted sphere
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