The Ushio G4T5 4.5W Germicidal Low Pressure Mercury-Arc Lamp is a specialized type of light bulb designed for UV-C germicidal applications. With a bulb shape code of T5 Linear and a clear finish, this model features a low pressure mercury arc technology that effectively kills bacteria and microorganisms. The compact size and low power consumption make it an efficient and cost-effective choice for use in various settings such as homes, offices, and healthcare facilities.