raysor65, Crappiepappy has pretty much nailed it, but I will add some more. I have used the 'Clamp-on' lights over the side of the boat with 50W DC bulbs. I just modify the connection for the connection to a DC battery with a multiple outlet power strip with Alligator clip to the battery and plug in the 50W lights.(you cut off the three prong plug on the power strip and add alligator clips to the + and- feeds). You can then use the plugs from each Clamp-on fixture to plug into your multiple outlet strip now since you've now converted it to a DC source. (Just remember you have DC bulbs in these if you use these at home. they will blow immediately if you plug them into 120VAC) You can get these 50W DC bulbs from RV type places and sometimes at Walmart. You hook these up to a nice size 12V marine battery, it should support 4-6 of these 50W lights for over 6 hours (look up the Watt/Hours on your battery. These will surprise you how much light they put on water. Other option is a small generator, but you would have use AC bulbs, and a lot more expense and noise. Probably TMI, but hope it helps.