Another way to do it is to train your plants to grow flat vertically. Tie your branches so that the plant ends up a few inches deep, but wide. Sort of like a cereal box. Then you make two banks of flourescents and pancake the plant. That's the way I did my first few grows using minimal money. I made one bank of flouros up against the wall, starting a few inches from the top of the pots and going up about four lights tall. Then put your plants up against the lights. Then take the next bank of lights and press them to the plants. Like a lite, pot, lite sandwich. A generous fan blowing up through the foliage helps to keep the temps down. When done like this I actually had plant touching lights and no ill effects. No lost lumens either and the result was phenom.