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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.
UV can also be measured as an irradiance, the incident power divided by the receptor surface area in watts per square metre (W m -2). Biological effectiveness of UV UV-induced biological effects depend on the wavelengths of the radiation emitted by the source.