Personally, I'm thinking if you want to flower 6 plants, you're going to need a lot more than 12 bulbs. Sure 2 per plant will work, but i think they always say the more light the better. I have 2 plants i just put into 12/12 like 5 or 6 days ago, and I have 4 x 23w 2700k, 2 x 42w 2700k, and 2 x 26w 6500k, so like 4 bulbs per plant. But I'm sure you can make something work. But if you just want to veg 6 plants, I've heard you can do this quite sucessfully with 1 or 2 bulbs per plant, so starting 12 plants is probably quite possible. Good luck and let us know how it turns out!