of coarse the 600 wattage will give you more...more lumens..more bud...but give somemore specifics...is the room white? you gonna get some mylar for reflection? just bought me some mylar...and from what i hear...its probably gonna give another bulb to me free...jjust from reflective difference between the white paint and the mylar...keep us posted...and be sure to get some good air flow in that room...big fans...