Quote Originally Posted by kingjustin
I was going to use a 400w HPS light for vegetation and haven't decided on flowering lights yet.
Pick up another 400 or 600 HPS, plus a 400 MH. Use the MH for veg. Use both HPS together for flower.

Or if you're cramped for space, a 250-400MH + your 400 HPS will be okay. I fit 12 plants in 12x12 square 3-gal pails under each of my 400w lights in the flower room. Any more, the plants around the edges just don't get that great light.

So it depends how much space you've got to work with, or how many plants you're aiming to have.