One that I was looking at is a 48" fixture with 6 compact florescents, 3 on each side of the tank. I was thinking of something like 4 6500k and 2 10000k. How would that sound? I didn't see any 5000k, but will see if they are available with them.
Was also looking at another fixture that has only 4 and not 6, it's a 265W total. Maybe 2x6500k and 2x10000k?
This will eventually be for a planted tank of course. Once I get the bulbs down, will have the local glass shop here make me glass tops for each half of my 55G. I already gave him my blueprints for the plexi pieces and all the cut-outs I want. Can't remember what he said they would use, it's not really plexi, but something a little better and is less heat sensitive. Once I have that all made up, which isn't going to be cheap, then will get the light fixture and start the setup of a planted tank.