Is moonlight a significant condition for making life possible on earth?
One significant biological event that requires a specific "type" of moonlight is the reproduction of corals in Great Barrier Reef, in Australia.

'One week each year in spring, after a full moon, millions of corals release eggs and sperm in what Bill Leggat, a co-author of the new study, called "a slow symphony."'

'An ancient light-sensitive gene has been isolated that appears to act as a trigger for the annual mass spawning of corals across a third of a million square kilometres of Australia’s Great Barrier Reef, shortly after a full moon.'