I am just starting out to grow my first crop. Looking for someone I can refer to when I have questions. Currently I have a 4'x4'x7' tall box built in the man cave of my garage. I live in northern Minnesota so it gets cold out, I try to keep my man cave a minimum of 60° in the winter. I plan on putting a fan an filter on my box for air flow. My main question is what wattage lights I should go? I'm thinking I could use the extra heat for the box. I plan on running Metal halide until they start to flower then hps. Any help would be greatly appreciated!