Alright, so i just came up on a 1000W HPS. I also have a 400W HPS. Right now i am rooting some clones. But when it comes time to 12/12 i only have about a 5x5x5 foot room in the attic, and it gets pretty warm on hot days. I would have a bunch of fans, but am worried about the top leaves because there is no air flow containing the bulbs heat. What is a good length to keep the 1000W at away from the plants? Do you think i should use the 1000W or the 400W?