okay now I am getting it I think. Basically I didn't think moist air coming from gen growing part of the box should go thru the hood and over the bulb. Does that affect it? Its an $70 bulb and I didn't think it should get moist air but I think that if I do what you said I should have no probs with heat the air ductfan for the tube is 80 cfm and if I use that for just gen intake exhaust I would have one 6'' duct fan pulling air out and I could use the other 4'' duct for just exhaust with the one tube off in cab that should work.. I just transplanted last night and they dropped for a bit and now look fine.:thumbsup: