have you decided which tank you want? FOWLR of reef? Live rock needs no light really. What makes it live is the little critters in the rock. Coraline needs nearly the same as LPS coral does. If you decide to make a reef go with a t5 setup, 54watts per bulb, 4 bulbs, and i know others will disagree but, two 460 bulbs and two 10k bulbs. Thats what i have and my open brain and long tenticle plate corals love it. Oh and the coraline growth is crazy.
P.S. Mine is a 55 gal also