This Germicidal Compact Fluorescent lamp is a specialist lighting solution that emits UV-C radiation for killing bacteria and other micro-organisms in water and air purification units. This 9 Watt 4 Pin 2G7 PLS lamp is an energy saving lamp offering an 80% reduction in energy usage and a8000 hour lamp life. Warning do not look directly at this light source as UVC radiation is harmful to the human eye.