I have the fan on a timer with the lights that could be the problem now its in a closet and I have a door that has slits in it for the air, but when I am ready for 12/12 i want to seal the door so no light can get in, but will that cause a ventilation issue? If I have fans on in a light prof room will that cause vent issues? I dont think it will, and I know I am suppsed to keep all light from getting in and out. I will have it off at night so nobody will be using lights outside the closet anyway