Zoo Med Professional Series Dimmable Clamp Lamp - BlackZoo Med Black Dimmable Clamp Lamp is great for reducing light heat output on all types of incandescent lamps. The in line simmer switch provides the perfect all in one solution for controlling heat lamps and ceramic heat emitters. Great for reducing light heat output on all types of incandescent lamps Includes on off dimmer switch Heavy duty ceramic fixture Turn your heater down on a hot day and back up when it gets cool again, adapt to seasonal