Bejay is right. If you want to expand your grow area, use the set up you have now for propogation and vegging and get some good light for your new box. If you go 4'x4', you want a 1,000 watt light. (Some people might argue that you can use a smaller light. Well, you could, but, if you want to take full advantage of your grow space, 1k is what you need.)

PC :smokin: