Contact bluewaterLED (board sponsor). He should be able to hook you up with plenty of non intrusive interior LED lights. I am not much of a catfisherman, but are they attracted to lights like crappie are? If so, you may want to get some water lights too. I have heard of people buying car headlights (they are 12v) and then they used the foam that the light is packaged in to float the lights. They just glue or tape the foam (since it already has the opening in the middle to see the light in the package, and is molded to the lights shape) to the light, and let them float around, using the power cord as a tether.