im personally running 8 42w cfls hanging above my plants. I did notice thou when i had my lights all around the plant insteed shinning from above is that the side growth was growing just as fast if not faster then the main growth point. Also in early growth i used LST method a bit to get more light to the inner parts of the plant. As for your yeild, something is better then nothing. Your plants didnt die, they flowered, they produced bud. They did what they were suppose to do. Mission accomplished!!!!!!