2 PCS Replacement Uv Light Bulbs 9w Watt G23 Base for Aquarium UVC Sterilizer Great UV sterilizer lamp tube. It generates 254 nm UVC rays to kill bacteria and viruses in aquarium, kitchen, bathroom, restaurant, etc. Made of special treated quartz tubes. It allows over 90% UVC penetration. It also guarantees less than 25% UV light depreciation after 8000 hours usage. Its more efficient and lasts longer than the cheap borax glass tubes in the market. Includes: 2 pieces of 9W UV light bulbs Specifications: 110V-120V / 60Hz, 9W Length Overall: 6-1/2" Average Life Hour: 8,000hrs G23 base 2-pin Odyssea UV Sterilizer 9W