Do you hae 4 feet total including the space needed for the lights and such?

I ran into the same problem, although I had 5 feet to play with. I decided to bend the plant ala LST method. I chose Northern Lights for my strain for the same reasons you did.

This is a pic of my plant. It grew more like a bush than a tree and stayed pretty short.

http://boards.cannabis.com/attachmen...chmentid=30933
http://boards.cannabis.com/attachmen...chmentid=39038