I bought the aqua illumination sol blue for my biocube and modded the hood for it to fit and I can tell you what a difference it made. Def worth the money. More upfront but you don't have to replace bulbs all the time. I know the general rule is 3watts per gallon.
I bought a homemade DIY one from a guy off Craigslist for 140 and he said he's sold about 20 before me and they all grew all types of coral sand the specs were good, and my torch and cauliflower colt coral seem to like it well enough to stay alive!