You could get one ballast that does both and a good reflector. I am thinking about getting a lumetek digital ballast. They say you can run both mh and hps bulbs with them. I am going to get a 400 watt and mh bulb to add to my 600 watt hps for flowering. I already have a 1000 watt mh ballast that I use for veg sometimes. Usually I just veg under my 250 mh and then run my flowering most of the time. I have a 3x6x6 flower area and then a seperate veg area for my moms, clones and seedlings.