I have one 1k HPS with an Ipower cooltube hood. It's basically the hood with a glass tube down the center that keeps air flowing directly over the bulb then out the other side. I have it pulling air from outside (there is an input filter), running through the hood, then out the other side of the room. I have a second 1k coming this week and was wondering if I can vent the hoods in sequence to save a couple hundred on the inline fan set up. The output doesn't seem particularly warm, I just don't want to burn up the second light with excess heat from the first light. Thanks in advance.