The Zoo Med ReptiSun 10.0 UVB Bulb is the #1 most popular reptile lamp worldwide! This efficient light source is ideal for reptiles housed in larger vivaria whose natural environment and behavior patterns necessitate increased UVB exposure. ReptiSun Bulbs emit up to 10% UVB and up to 30% UVA UVA wavelengths help to increase appetite, activity, and induce reproductive behavior UVB aids in Vitamin D3 synthesis and calcium absorption ReptiSun 10.0 UVB Bulbs provide an effective source of UVB without emitting excess heat, and are ideal for Old World Chameleons and other reptiles that need high UVB exposure without higher temperatures. These lamps allow UVB-assisted photo conversion up to 20" from the lamps surface (compared to 12" on the Reptisun 5.0), which allows the proper UVB wavelength for turtles and tortoises. Taller cages, screen cages, and tank covers can reduce the amount of UVB rays getting to your reptile. The Reptisun 10.0 is the solution! These fluorescent bulbs emit more UVB than any other reptile lamp. Lamps should be replaced every year for optimal effectiveness. 1-year manufacturer warranty. Recommended distance to animal: 10"-20" Made in Germany. Note: Contains mercury. Check with your local waste company for disposal instructions.