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. Zoo Med's "flat-faced" design is more efficient and longer lasting than conical designs which build up excess heat internally, ultimately carbonizing the element. Our emitters last up to 5+ years. Perfect for high humidity terrariums. Great for use with Repti Temp 500R Thermostat. UL/cUL Classified Ceramic Heat Emitter when used in conjunction with Zoo Med's Repti Porcelain Clamp Lamp.