Yeah that will work for a 600, just make sure you have good air flow and venting. Those 600watts can get pretty hot and burn plants if not careful. You wont get the whole room full under one 600 unless you use a light mover. But if you want room to walk and work you can have the lamp in the middle of the room and it would light up about 5-7 feet by the 4 feet deep. The other choice it using two 400w or 600w spaced evenly apart would light that area better. Narrow areas are really fun to grow in but can be tricky. I have a closet grow i right now with a 400watt hps and a light mover. The closet is 9'x2' and the 400watt fills most of it with good to great lighting. I would rather have two 400w lamps but the light mover saves me electric money and I can still grow more plants. The best advice is to go with what you comfortable doing, keep it simple and then slowly make upgrades when you feel its time, and you have more experience.