Check Amazon for some decent cheap LED lighting systems. They have some pretty good deals in 160w programmable lighting. I would try to get something in full spectrum, meaning more than just whites and blues. Greens, reds and purples aren't necessary for the most part for the corals, but it makes it easier to look at for your human vision spectrum.
There are also good deals on eBay for the same unit or very close to it. I think this time of year they should be about $90 each.