opie the only link I can give you is to go to your local magazine shop and purchase this months issue of Hightimes magazine.
i dont have it in front of me but they do three separate grows with the UFO compared to a 400mh, a 400 hps and a 600 hps. and they CLAIMED that it produced around the same as the 400 hps. That is all i know. maybe you can get it at there site

Doughboy