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. Available in 20, 30 and 36 widths. Convenient on/off switch. The 30 and 36 hoods feature an energy efficient, flicker-free electronic ballast.