I'm thinking about buying the full moon light. There is a lot of info on these lights on the bassboatcentral.com website along with a review. I think the length of your boat is the main factor in whether you need the full moon or half moon. They are really supposed to put out a lot of light for their size. You might also check with the guys at Backwaters here in Lex, they sell them and can give you a lot of info.