Here's a single white spotlight at 10% without GC. Nobody would use a single 10% light as the only light source in the scene. This looks dumb. You'll never find this in a published light set, even if it's supposed to be "moody". It's too dark.

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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)