I started out with two light on each side and added the third. The third (middle light) was just below the water and seemed to cover more area than the other two that were several inches under the water. If you are going to use only two lights you might want to try the 27 watt lights that some of the other guys have been using. I ordered one to try out and it is supposed to arrive in today's mail. If I had to do it all over, before mounting the lights I would take them out in the water with my kayak and get a better feel for how they perform and try to determine the best placement. Over all my set up worked pretty well (although I never went with really good conditions and I never actually saw a flounder) but I can see some improvements that I could make. I may re-do them for next year making the frame a lot simpler and moving the front and rear lights more forward to accomidate best angle when standing and poleing. Hope this helps to give you some ideas.
Greg