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; Sun Glo, Sun Glo Tight Beam, Sun Glo Neodymium, Sun Glo Halogen, Repti Glo Compact 2.0, 5.0 & 10.0, Heat Glo, Solar Glo 125W, etc. The coating reflects the otherwise wasted light rays and stores the light energy during daytime and slowly releases it at night, which makes this fixture more energy efficient then conventional fixtures. No need to add an additional night bulb, unless used as a heating source.