Highdas 2X 40W Reptile Vivarium Ceramic Heater Heat Emitters Lamp Bulb Screw Fitting This ceramic heat lamp has a broader sun-like spectrum of infrared radiation than incandescent lighting and emits no visible light. The long wave infrared heat produced by these ceramic heat lamps will warm reptiles very efficiently. To prevent the vivarium or enclosure from becoming too hot we recommend the ceramic heat should be controlled using a thermostat. Innovative design with 99% heat efficiencysolid ceramic element, suitable for humid environmentsno light emitted  ideal for day or night use. Size 49mm Diameter x 55mm Length