I started this thing with a box made in the shed,30X60 inches and around 5.5 feet high. It was constructed with 2x4 and 2 inch thick styrofoam-2 layers uptop and 3 on bottom. It has 2 T8s 4' long 1 fixture, It also has 2 24 watt 6500k,4 42 watt 6500k,2 55 watt 2700k.I think once I added and it is around 600 watt equivlent. The plants seem to be doing well,with fall on the onset and nights dropping down to mid 30 to 40s it stays a comfortable 63 at night (lights run at night) 73-75 durning the day. Cooling is provided by 1 3" exhust fan that runs all the time,4 3" fans (2 exhust and 2 intake? that are on a thermal cube that turns on at 78 and shuts off at 70, and a fan that circulates air. Im reading now that HID would be the way to go when flowering-but I cant see it in this box due to heat restrictions-they would surely burn up.Besides my thought was to keep it cheap-nice try at even the level I am at. Would a T5 be the way to upgrade?Will a VHO bulb work in a standard T5 fixture?Will it produce the lumins needed for flowering?I think std t5 is 2500 and vho hits 5000. It would be easy to spend 80-90 bucks and get a HID-but the heat. The pic you see is before my first set of improvements-just wanted to give you an idea.