UV GERMICIDAL T5 22 Watt Germicidal 4 pin UV Lamp. UV germicidal lamps are used in air and water purification systems as well as other applications to inactivate microorganisms such as bacteria, germs, mold, and virus. Applications include food processing, medical facilities, air conditioning systems, pharmaceutical production, clean room, drinking water, photochemistry, phototherapy, dermatology, wastewater, laboratory/research, and other sterilization and disinfection needs. Warning: Protect your eyes and skin when operating Germicidal Lamps. Equipment should be designed to completely screen or filter UV-C radiation.