Get yourself two light movers on rails...use 2 - 1000 watt hortilux HPS bulbs for flowering and use high quality 1000 MH bulbs for vegging with digital ballasts which are all instantly switchable from HPS/MH, run very cool, and are more energy efficient than the old magnetic ballasts. Run the lights on the opposite sides of the room from each other so there is always coverage of light on the entire garden, get the best reflector you can afford also to maximize your light output...you can flower the whole room this way with excellent light levels and yield 3-4 pounds pounds per cycle..maybe much more with big plants. You could also do three 600 HPS not on movers which would be more efficient total light output wise and provide even better coverage but would have a higher initial startup cost. This would be one way to "maximize the room" Big plants in 5 gallon buckets will do it in this case.