Day Light and Night glow fixture in one, provides long-lasting luminous reflective glow, heat resistant, porcelain light socket, Ideal for use with all types of incandescent light bulbs. The Exo Terra Light Glo Clamp Lamp gives you the versatility of placing heat and/or light sources on your terrarium where needed. Sturdily constructed, with a metal relfector; heat - resistant ceramic socket; and a spring loaded swivel head clamp. The inside of the reflector is coated with a highly reflective, luminous coating that continues to glow after the lamp is turned off, depending on the strength of the bulb used (only with light emitting incandecent bulbs). Maximum wattage 100w.