Moonlights, How bright should they be?

[fishquaria]

How bright should a moonlight be for a thirty gallon cube? Is one LED or two too much?

[bureau13]

IMO, since their primary purpose is aesthetics, make them bright enough that you like the look. I know, people claim they help coral spawning (is this really a good thing in your tank???) and they have these fancy lunar cycle simulators, but I'm not convinced.

jds