For most purposes, ozone production would be a detrimental side effect of lamp operation. To prevent this, most germicidal lamps are treated to absorb the 185 nm mercury emission line (which is the longest wavelength of mercury light which will ionize oxygen).

How do ultraviolet purifiers work?

UV purifier units contain one or more germicidal ultraviolet lamps. Germicidal Lamps are shortwave, low pressure tubes that produce ultraviolet wavelengths lethal to microorganisms. Approximately 95% of the ultraviolet energy emitted from germicidal lamps is at 254 nanometers, the region of germicidal effectiveness most destructive to bacteria, mold and virus. Therefore, the water or air that passes through the chamber is exposed to the germicidal uv light and the genetic material of the microorganism is deactivated, which preventing them from reproduction and rendering them harmless.

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