Blue Spotted Two Pack Of Mercury Vapor Lamp TI (100 Watt) - Provides Essential UVB & UVA For Reptiles- Tested & Inspected & 100% Satisfaction Guarantee Two Pack Of Self-Ballasted Mercury Vapor UVB Lamp provides essential UVB & UVA for reptiles Helps prevent metabolic bone disease in reptiles and the prevention of calcium deficiency in reptiles Fits standard ceramic sockets on clamp lamp fixtures. Great for turtles, other reptiles, and birds in large enclosures, terrariums, and aviaries. Studies show that natural sunlight provides benefits to reptiles. Recommended for terrarium setups that allows reptiles to regulate their exposure to UVB and UVA.Please check with your local reptile store when choosing a lamp. Use with appropriate clamp lamp fixture. Besides the vapor bulb, consider these other bulbs and items: Blue Spotted Basking Spot Lamp, UVB 10.0 Compact Fluorescent, heat emitter, clamp lamp stand, clamp lamp, and wire cage clamp lamp Tested & Inspected for issues. Each TI model unit is tested individually to insure it is working & inspected to insure you have a hassle free purchase.