+1 leds are an excellent choice and can be just as good, if not better, than any other light source. I think this is true for tanks of any dimensions. The problem, is with MHs you can more or less get away with simple formulas. You can (sort of) just say 1 bulb per x inches and y watts for z depth. Leds allow for much more customized configurations, but also, much more room for confusion. If you don't understand what you are doing, your setup may end up ill suited for your application and you'll think they are junk. They aren't junk though and neither are MHs or T-5s etc... They all have advantages, be it price, simplicity, efficiency etc..