I just picked up a 48 inch led set from beamswork just to test it out to see and I like it a lot better than my pc 110 watt coralife.
I don't have my aro yet, but the fish I do have look a lot better as the white is a lot cleaner white. The pc's were 10000k but I like the led's way better.
If I were to do it again I would order 2 of the 48 inch ones for my 180 as they are in my canopy which is a bit above the tank.