Exo Terra Reptile UVB100 T5 (3%) VHO (Very High Output) lamps have been made in Germany to the highest quality standard, ensuring a prolonged UV output of 12+ months for lasting performance. With its intense output of UVA and UVB rays - combined with a well-balanced visible light spectrum - the Exo Terra® Reptile UVB100 T5 Very High Output Bulb is specifically designed to meet the needs of reptiles, amphibians and invertebrates inhabiting the Cryptophotic Zone. The intensity of the emissions varies depending on the distance from the basking area. Available in 8w, 24w, 39w, & 54w sizes.