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UV Irradiance is the radiant power, within a stated wavelength range, arriving at a surface per. unit area, usually expressed in watts or milliwatts per square centimeter. Irradiance varies with lamp. output power, efficiency and focus of its reflector system, and distance to the surface.
How UV Light Kills Bacteria. To understand Ultraviolet Germicidal Irradiation (UV light bacteria killing effect), itâs imperative first to understand what ultraviolet light is. Ultraviolet light is the light between X-Rays and Visible Infrared on the light spectrum, with wavelengths between 100 nanometers and 400 nanometers.