[Harry Red]

Thanks FreakNature! It works well for my purposes.

You can bring the sides in on the top and get more of a tent shape, which will give better light coverage.

Since this box/tent is in a dark, cool basement, I don't have to worry about light leaks. There is no light coming in down there. I happen to have a heat/air vent just above it to help with temp control and I wanted it open at the top and bottom for good air flow.

I guess with a little more care an effort, you could use black/white or panda film and button it up.

I do plan on using another corner of that basement for a veg room, so all I have to worry about is the two outer sides. I can handle that by tacking thick black/white poly from floor to ceiling and not bother with PVC.