The lights Iguana Don and Atomox are talking about can also be purchased at home and garden stores (Lowes and Home Depot ect) for a lot less that their dive brothers. The 3 "C" cell at a dive store is about $29 where the one at the home store is about $19. They are exactly the same lights sold under another name. I have used them for years (both the 3 "C" and the 2 "AAA" versions)and have had good luck with them. By the way, they also sell replacement bulbs for a lot less also.