OK. Time to decide on lighting. I have read that 20k XM bulbs dont require actinic support so I have decided to go with 2 250 watt reefstars with 20k bulbs. Does anybody have something similiar on a 55gal? Does anybody have any advice against this decision? Or is this a good way to go for my future clam tank?

If 20k's will work then I would like to use Reefstar fixtures. Any cheaper alternatives would be nice, so key in if you have any ideas.