I want to have some extra light in my closed chamber and thought about placing a lamp on top of my glass cover with a low wattage bulb, but will it be safe? Another reason is because my glass cover builds up condensation and I thought the heat of the lamp would reduce the amount of condensation. I know glass breaks when heated to a certain degree, but would the heat be enough to do that? Also, I haven't been able to find an incandescent lower than 40 watts anyone know where I could purchase one?