3U/spiral-15W/20W/25W tri-phosphor average life: 6000H This kind of lamp can remove cigarette smoke, Reduce Odor, Improve Immunity, hasten metabolism, slowing down aging. It is good for your health. ION PURIFYING LIGHT = AIR PURIFIER + ENERGY SAVING LIGHT ION purifying light is made of the high technology and skillful design. This lamp's spreading uses the technology of aerodynamics. It makes anion to become ion wind and uses the effect of light between heat energy as the light spread to all the space. It is combining all the advantages in energy saving lamp and air purifier.