thanks for responding well the tube is air cooled about 78 degrees with the lights on (no intake was thinkn about hooking up one to the other side of tube) but thats hooked up to 6" outtake fan to carbon filter ?(do i even need it hookd up to that this early)and humidity has been about 45-50%gonna do the thermometer thing ya talked about tho i've just had it on the floor in the center of the room. also lights are about 19 inches above plants and tube doesnt feel warm i can easily hold my hand under it for a long time with no burning