Ok, I went the ghetto cheapy route...and it's worked out great for me. I have tons of coraline in my sump.
1 house lamp socket on a wire clamp (in the extension cord section in Lowes/Home Depot)
1 flood light with the flourescent spiral tube light inside (lighting section)
Total cost...about $15...and it clips on anything you want to mount it to. It's great.
I can't get rid of my macro fast enough...definitely plenty of light for it!