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. Available in the following: 60 watt (for 10-20 gallon terrarium) 100 watt (for 30-40 gallon terrarium) 150 watt (for 50-100 gallon terrarium)