I have a post about a bug light I'm considering. I have one hooked up to AC power, was just asking about running with a battery in my other post. Anyway, the following link takes you to a supplier of this type of light. It doesn't zap them, the light attracts bugs and a spinning propeller knocks the bugs in the water. I have an old one, and before my tank dried up it worked great! There would be everything from bluegill, to LMB, to Channel Cat eating the bugs. This light seems a little high, I think it would be possible to make one, but the one I have works great. Hope this helps.
http://www.suttlefish.com/buglight2.htm
