I did the same as Trailer Park Fishtanks demonstrates above; using CFLs and wiring them right into an old florescent hood. They are cool and put out tons of light. I took it one step further and wired in a blue LED flat nightlight ($3?) so that I have a 'moonlight' at night. Not that the plants or fish in that tank needed it, I just like the glow when watching a movie at night with the lights off.