"You will likely get better control of your lighting and much less render time by choosing "Constant" or, at the very least, "Inverse Linear" lighting under the Light Option panel for individual lights."

This advice will not improve render time and will reduce realism if you use Constant on spot or point lights. If you're doing local lights (like a candle, a lamp, a flashlight) the only correct setting is Inverse Square.

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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)