ReptiCare Ceramic Heat Emitters are the perfect 24 hour heat source for all reptiles. These porcelain heating devices screw into a standard porcelain incandescent socket, giving off intense "muscle-penetrating" infrared heat, while emitting no light. The flat-faced design is more efficient and longer lasting than conical designs which build up excess heat internally, ultimately carbonizing the element. Additional Information: Lasts up to 5 years. Perfect for high humidity terrariums. UL/cUL classified when used in conjunction with Zoo Med's Wire Cage Clamp Lamp.