This is the IBL only render without GC turned on in the shader. I doubt you started with your light this low. Nobody is used to using such a low light.

If your non-GC render looks brighter than this, you're starting with too much light.

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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)