I didn't use any lighting. A light has no effect on this shader. This is because Reflect and Refract don't pay any attention to lights - they show scene objects modulated by the surface they're on.

The shader shows objects around it reacting to light, so light affects it, but only indirectly.

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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)