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. This allows diurnal reptiles and amphibians to retreat in their night burrow or hiding without stress. A moon like glow enables nocturnal reptiles and amphibians to see properly without disturbing their night cycle. It is also ideal to monitor your animals during night time without switching on the lights which can cause stress and disorientation. This multi-purpose fixture fits a variety of screw based bulbs. - Day and night fixture in one. - Provides long-lasting luminous reflective glow. - Heat resistant porcelain socket. - Ideal for use with compact fluorescent and incandescent bulbs. - Prevents stress. - Ideal for nocturnal viewing. Available in 3 sizes Small 14cm Medium 21cm Large 25cm.