The First Light part # G10T5LC-F is an Instant-Start Germicidal Lamp. This is a UV replacement fluorescent light bulb, which are germ killing fluorescent UV lamps. They are used in disinfection of municipal wastewater, industrial process of water and primary drinking water, as well as in the disinfection of air and HVAC systems. Additional applications include food and beverage processing, as well as ink curing applications, wherever killing of airborne germs in needed. This item has a maximum power output of 17W, and 51V, with a maximum current output of 425mA. It??s Base Face ?? Base to Base is 357mm, Arc Length of 281mm, 15mm in diameter, and rated life is 9,000 hours.