Alex, you have done about all you can. Something reflective would help so go ahead and do that. When your plants outgrow that 3'x3' box and you need to enlarge it, just remember to plan on using a 4'6" shop light and go with a 4-tube fixture.
Good growing.
drdawg (Dr. Kenneth Ramsey)
The reason it's so hard to lose weight when you get up in age is because your body and your fat have become good friends.
