keeping temps under control in a tent while running de can be a challenge. a de will out-yield qbs in most circumstances (provided your environment is under control), but if you are not working in a larger space in which multiple light fixtures will be employed, i would go with the r spec. diy it if you want to save yourself some cash and have the option to customize it to suit your space/needs/taste. also you may be able to get away with no a/c if you go the led route, with de you would definitely need it. the led will cost way less to run than a de, too