Single infinite light. intensity can be anything you like, since the perception of light by a camera depends on shutter speed, f stop, and sensor sensitivity. At ISO 6400 and f/2.8, moonlight looks exactly like sunlight.

However, you moght try an intensity of 5 to 10%.

Falloff is not a factor and should be set to constant, which is the default.

The difference in overall lighting is the sky at night is black. Well, unless you have that super sensitive camera setup, then it is blue even at night.

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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)