I'd suggest go to ebay and search for LED flood light. Depending on how much light you want.. there is anything from 10watts all the way up to 160+ watts.. They are pretty efficient too, producing around 90 lumens per watt. Most of them use SMD led's now I'm starting to see some using the CREE led. I am trying out the 30WSMD, it's bright enough, love the shadows it casts, and the shimmer when you have rippling water on the surface.