Part of routine maintenance for your Multi-Tech Surround Air XJ-3000C, XJ-3000D, XJ-3000E and XJ-3000 F air purifier models is replacement of the UV-C Light. R eplace the UV light in your XJ3000 every 12 months . Keep your environment free from germs, viruses, bacteria and mold. The lamp life is 10,000 hours. However, the UV output diminishes during a year and no longer is effective at destroying these micro-organisms. The UV light in the Surround Air XJ-3000 should not be overlooked when maintaining your health and that of your family.