The ReptiSun® Terrarium Hoods are low profile hoods designed to hold one T8 size linear fluorescent lamp. The ReptiSun® Terrarium Hoods feature a built-in reflector which allows for deeper penetration of visible light and UVB into your terrarium. Convenient on/off switch. The 30″ and 36″ hoods feature an energy efficient, flicker-free electronic ballast. Available in the following styles: 20" - Holds 18" T8 linear Fluorescent lamp (not included) 30" - Holds 24" T8 linear Fluorescent lamp (not included) 36" - Holds 36" T8 linear Fluorescent lamp (not included)