Lighting for Lemon Tree
I have a Eureka lemon tree in my north/east facing apartment. I currently have it in a small greenhouse with two compact fluorescents giving it some more light (the only natural light it gets is morning sun). It has been doing fairly well, and was even happy enough to put out a lemon, the only problem is that since they are the compact fluorescents, I have to keep them relatively close to the tree's leaves, and it is now starting to grow on just one side.
So, my question is this: is there another (cheaper) lighting alternative, or should I shell out the $300-$600 for a "grow light" from my local garden store? Any help will be great!