Ok nice setup. Just a few words of critisicm about the efficiency of your grow OP. You have cool tubes right there, which also have reflectors to reflect light back down. This isn't particularily effective as light setups go, your losing a substantial amount of light having it go through glass. Light (most) all bulbs, only half the bulb sees the plants canopy, so I can see your logic in reflecting the top of the bulb back down. In a senario like this, light is passing through the glass at the top but its being reflected back down, back through the glass, so your effectively heating your bulb up, which is definatelly not a good idea. Expectedly, you have increased the lumens hitting the plants somewhat. But I'm suprised you don't have serious hot spots, even with the closed vent ventilation. If you are so adament on using cool tubes, at least get one's with the reflector inside the tube, you wouldn't have to scrape what you have, just coat the top half of the tube, on the inside, with reflective material. And scrap the reflectors altogether.