Agreed, to keep SPS corals you will need to get some pretty strong lighting. The cheapest way to do this is to get yourself a PAR 38 that is rated for corals or get yourself a Chinese Black Box. Just know that as you get deeper and deeper in this hobby, you will quickly replace these lights for something more robust and a "cleaner" light output. I'm not going to jump on my soapbox because I have done this several times before but, you need to do some research before you purchase anything in this hobby. You will quickly start to waste your hard earned money buying things that look pretty in a tank but will die quickly or slowly in your tank if you do not have the right parameters for it to grow.
I'm not immune to it either, the other week I bought a Electric Red Scallop and Candy stripe Pistol shrimp for my Display Tank thinking they would do well in my tank. Well I didn't realize that the scallops would be preyed on by my wrasses and not last a week in my tank and the Pistol variety has been documented to prey on sleeping fish. Needless to say, I put the Pistol in a part of my sump away from fish and the scallop shell ended in my trash. Lesson learned, do plenty of research before buying anything.