The Exo Terra Glow Light gives you the versatility of placing heat and/or light sources on your terrarium where needed. The device is sturdily constructed, with a metal reflector, heat resistant ceramic socket, and a spring-loaded swivel clamp. It can be easily turned off and on by the switch, mounted on the extra long power cord. The inside of the reflector is coated with a highly reflective luminous coating that continues to glow long after the lamp is turned off.