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This is something I'll have to fix when I get into the Lux source and build my own version. It's really annoying that it doesn't have a simple option to disable the division by total area and just use the gain setting as is to define the luminance density instead of total luminance.

In the meantime, if you'd like me to include surface area computation in the geometry exporter, just ask.

-- I'm not mad at you, just Westphalian.