I've got 4 GDP, all in 5 gal smart pots with tga super soil. My tent is 4x4x6, and my plants are about 6 weeks into veg. I have a 600 watt ballast dimmed down to 400w mh, when I switch to 12:12 hps I plan on running the full 600. But I do have a 400 watt hps just sitting around, what does...