QUOTE (Nemo Niblets @ Mar 16 2010, 06:30 PM)

I don't think it's very important. Some people think moonlights help a natural cycle, but it's not proven. The moonlights don't do anything, and your tank doesn't need them.
I personally keep my 150w sunpod from noon to 11 PM.
Personally, I dont think that the moonlights benefit the cycle- but, sure enjoy being able to see in that tank at night- being able to see all those little bitty critters in the live rock-