When I worked at a dealership I sold the "Titan Projection Light Systems" to customers and had them on our boat. We carried a couple other brands (Skylon, and Liquid Audio) but I really believe the Titan PLS are the best lights out.
http://www.titanwake.com/products/titan-tower-lights/titan-projection-light-system They have a light shield on the bottom of the lense to prevent hull shine/reflection and they are more of a spot light than flood. It comes in a set of six lights (two bars with three lights on each); with 4 lights aiming forward and two aiming back; I never had a problem with seeing anything. I haven't tinkered with the new "Z" tower, and depending how adventurous you are, you could tap the tower and mount the bar or pull the lights off the bar and mount them directly to the tower. I see the bimini lays on the top (that makes it interesting) so you would have to mount them underneath next to the speakers or on the side of the tower. Then I used a 3 way toggle switch with on-off-on and had it wired to where the forward position was "all on" and the backward position was just the rear aiming lights on.
Hope some of that info was useful... have fun