Without a daily dose of UVB ultraviolet light, reptiles from desert regions won"t produce the calcium needed for proper bone strength, Desert 50 lamps deliver a full desert UVB (50 microWatts per second/cm2) in a range of sizes to fit most terrariums, Includes Desert 50, T5 fluorescent bulbs for full UVB, UVA and visible light to flatter reptile colorations, housed in a sturdy aluminum fixture in sleek designer black, The highly polished reflector is protected by a full-length acrylic lens cover, and the entire unit fits in a space only 1"" high, Meets CUL standards, For extra convenience, add a R-Zilla Power Center to automatically match your pet"s day/night life cycle (sold separately), Fixture and bulbs in one convenient package, Desert 50 bulb builds calcium in pets from arid climates, Fits in tight spaces - only 1"" high, A complete selection for healthier desert habitats, Size: 20"" Single, Dimensions: 27, 50""L x 2, 75""W x 1, 37""H, SKU: RYLHC4777