Hmm. There are limits to how you can use objects as light sources, caused by how Lux interprets the "gain" on area lights.

The gain controls not the luminance of the object, but rather the total energy given off by the object. This means that two objects (or actors on a figure) that have the same gain, but a different total surface area, will appear to have different luminance.

Here Andy is a light. But some of his parts are much bigger than other parts. The larger the part, the darker it is.

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.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)