I got real lucky and had three 250W hps kits and one 400W mh kit with extra lamps for both leftover after one of my jobs(I'm an electrician), and that's what I'm using full-term in my 4'X4' closet, with a couple old, but reliable and quiet fans. And I am what I call, "super-cropping" the 4 random strains that ended up being females out of the 9 I started. i think one is a G.D.P. I got when I was wiring a big coop out in CA, and another is a different purp, not sure, but i think it's a haze, one is a pure sativa, and the other a different more hashy smelling hybrid. But, my God, the awesome soil mix I put together with several different ingredients, incl, nitrogen strong bat guano, worm castings, diluted liquid seaweed, peat moss, perlite, and some fairly plain, but 100% organic soil coupled with the excellent light, temp, and pruning and branch-bending techniques are proving to show me a bumper harvest! Still gonna veg 'em out for about 4 more weeks tho. But, it will surely be a very, merry Christmas for me, and some friends!! Good luck with the tent/chamber idea!