Well I was going to get a 600w for my 4x4 grow tent and will have cooling system set up in it, but was told a 400w would do just fine, your opinion? Also a guy from the hydro store told me I could veg under my floro but didnt specify how long. Im only thinking about vegging to about 12"-18" but 16-24 at a time then forcing to flower in the grow tent so as I only need the grow tent area and outside the tent vegging with the floros, I dont really want to make another seperate section. would I get that height in 2 weeks under my floros or would I run into problems. Its all trial and error which makes this a great hobby, especially for me while I study but dont want to hurt the seedlings either. As I said, I was wanting to do a higher number of plants because Im using this Hydro bucket method not exact but very similar. let me know YHO.