Zoo Med Reptisun T8 Terrarium Hoods provide crisp, bright light, with low profile shapes and built-in reflectors for deeper light penetration. Each hood holds one T8 fluorescent lamp to provide essential UVB and visible light for your reptiles. Low profile reptile terrarium hood Provides essential UVB and visible light Convenient On/Off switch for easy operation UVB is needed for growth and strong bones, and helps to prevent or reverse Metabolic Bone Disease. Use this hood with a Reptisun 5.0 UVB linear fluorescent lamp for tropical species, or a 10.0 UVB linear fluorescent lamp for desert species. Use a Naturesun linear fluorescent lamp for most species of amphibians or snakes. The 30" and 36" hoods feature an energy-efficient, flicker-free electronic ballast.Note: Fixture only. Lamps sold separately.Specifications:20": 18" 15W T8 Lamp (Not Included)24": 24" 17W T8 Lamp (Not Included)30": 24" 17W T8 Lamp (Not Included)36": 36" 25W T8 Lamp (Not Included)48": 48" 32W T8 Lamp (Not Included)