The newest Mercury Vapor bulb designed especially for 110-120V use here in the USA! Provides UVB, UVA, visible light & infrared (heat) energy from a single lamp Important for reptiles development and health. Aids the synthesis of Vitamin D3. Helps prevent metabolic bone disease. Stimulates reproduction. Can be used alongside Arcadia linear Reptile lamps to generate a targeted photo-gradient. No external ballast required.