Yeah you have much bigger growers than I but I like my waterfarms for the whole space saver reason. I am using a 400 watt Hps with a remote ballast which sits outside my grow tent. I got it with the bulb and reflector for around 180 u.s. dollars from htgsupply.com. I wish I had gotten the mh/hps with reflector combo from them instead since it is around the same price. That way I can use the metal halide for veg and the hps for flower or vice versa.. don't remember. Lighting definitely makes all the difference on the yield tho. So... if you are going to get a hid lamp setup... go with the combo lamp set if you can! Cannot go wrong with that. You can interchange the bulbs and get some kickass grow for sure. I will get that lamp set later on but my hps works great overall for all stages. Its really no big deal I guess now since many hydro shops carry an hps bulb which are specially designed to ouput more blue and red than regular old hps bulbs. I get my replacement bulbs for around 39 bucks after shipping and all. You will do badass with a hid bulb for sure! :thumbsup: