This 30 Watt T8 Germicidal Fluorescent lamp with a double ended G13 base is an energy efficient Ultra-Violet 900mm tubular lamp used in water and air disinfection units to aid with the deactivation of bacteria viruses and other micro-organisms. Common applications are pond filtering and disinfection of drinking water. Warning do not look directly at this light source as UVC radiation is harmful to the human eye.