That room could technically use 5000w worth of lights at 50W's PSF, but if your looking for approx a QP a month I would think about sectioning off a 4x5 area and throw a 1000W HPS light and do another area the same and throw up a 600W MH for veg, run a 750 CFM fan on a can filter and get an oscillating fan for each grow area.
Hope this helps some, remember don't underestimate the heat.
Adieu