Zoo Med ReptiSun 10.0 UVB T5 HO Lamp, 39 Watts Uva wavelengths help increase appetite, activity, and induce reproductive behavior Aids in vitamin D3 synthesis and calcium absorption Full SPECTRUM, low-heat lamp Stronger UVB and Brighter Light: Twice as strong as standard ReptiSun 10.0 Lamps! Increased UVB Output: Perfect for larger reptile habitats. Increased UVB Output: Perfect for larger reptile habitats (see lamp distance notes on package). Helps to prevent or reverse Metabolic Bone Disease commonly seen in captive reptiles. Used and recommended by Zoos, Veterinarians, and top reptile professionals. High quality Made in Germany.