Sounds good but hard to find 750 bulbs. Think about this one, http://www.bghydro.com/BGH/itemdesc....V10120&eq=&Tp=
Same place but it's a 1000HPS and MH. Remember you can put a smaller bulb in a bigger ballast but not the other way around. This is the one I will get soon. I need to save on electric and this one is 120 volts, much easier to find power. Go for a hortilux eye bulb, you don't know the difference till you try a cheap one.