first mh and hps are not interchangable so you need to find out which one you want then pick a ballast kit either hps or metal halide.
here is a hps http://www.1000bulbs.com/products.ph...ressure-Sodium
here is metal halide http://www.1000bulbs.com/products.ph...Halide-Ballast
im sure there is probably some cheaper places just dont know of any off hand and you should choose a multitap ballast kit, multi tap means you can wire it for different voltages standard house current is going to be 110 or 220 volt while there is other industrial voltages like the one you linked to a 480 volt ballast kit is going to be useless to you as you wont be able to use it.
bejay Reviewed by bejay on . Noob questions and Answers - Brand New I made a shot but effective guide to growing from what I have learned so far as well as a list of questions I have that can help me and people who will read this guide. My Questions: What are the chances of getting caught because of ordering online from seedboutique.com? Would a 50/50 Perlite/Peat Moss be a high quality way to start germinated seeds before transplanting to Ocean Forest? Is 400w HID enough for 4 plants, with Mylar surroundings? Is there a big different between MH lighting Rating: 5