These high output fluorescent reptile lights have the most concentrated UVB spectrum available. They emit up to 10% UVB and up to 30% UVA; outputs activate UVB up to 20" from the bulb. UVA wavelengths help to increase appetite, activity, and induce reproductive behavior in captive tortoises, turtles, lizards, chameleons, amphibians, and other reptiles. Also aids in Vitamin D3 synthesis and calcium absorption. Full spectrum, low-heat lamps are great for reptiles with increased UVB needs. UVA and UVB emissions last 1 year.