The exo terra glow light gives you the versatility of placing heat andor light sources on your terrarium where neededr 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 cordr 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 re