The Zoo Med 18 inch Naturalistic Terrarium Hood is designed to fit all 18 inch wide Naturalistic Terrariums. This hood can hold one ReptiSun 5.0 compact fluorescent UVB lamp and one incandescent heat lamp up to 60 watts (e.g. Zoo Med's Daylight Blue or Nightlight Red Reptile Bulbs). A built-in reflector allows for increased heat/UVB penetration in your terrarium. An on/off switch is conveniently located on the back of the hood.