My space is 2x4x7 closet. I have a home made Air-cooled reflector (18"L x 31"W) enclosing a 400w HPS. The veg and flowering were done under the same light.
The grow was done organicly in Promix 40%, worm castings 25%, perlite 20%, vermiculite 15%, bone and blood meal (just a bit).