Iguana Light 5.0 UVB fluorescent bulb provides UVA, UVB and visible light. The UVB wavelength helps to prevent or reverse Metabolic Bone Disease in green iguanas as well as other species of lizards in captivity. It also allows all reptiles the ability to regulate their own vitamin D3 levels by endogenous synthesis as they would in nature. Energy efficient T8 size. Shipping weight: 3 lbs.