Cold Plasma UVC bulbs should be replaced after 80,000 hrs, this is about 1-3 years depending on the level of use. Each machine has a UV Lamp Replacement Indicator that allows you to see a safe level of light shining through, when light is no longer visible then replace the bulb.
To ensure the continued effectiveness of your device, please replace bulbs with BioZone's Original Cold Plasma bulbs. You will find less expensive bulbs for sale online that purport to fit our products but will mismatch the synergistic effects of our Cold Plasma technology. They have lower amperage and voltage which are the measures of electrical current or flow of electrons; hindering the reaction and producing less than desired results.