Typically, a UV lamp being used primarily to disinfect the air circulating through a home or small office should be replaced every 9000 hours or approximately every 12 months. or people with respiratory conditions or other acute sensitivities, we strongly recommend keeping to an annual lamp replacement schedule for the best control of airborne microorganisms and allergens.
Replacing a lamp before it literally “burns out” may seem wasteful but not when it comes to UV light. After the first year, all UV lamps by their fundamental design will have lost nearly half of their germicidal effectiveness. That’s why, for air disinfection – where the target organisms are moving with the airstream and have a short exposure time – it is critically important to keep to your one-year replacement schedule.