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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.
Ultraviolet (UV) light is a form of light that is invisible to the human eye. It occupies the portion of the electromagnetic spectrum between X-rays and visible light. The sun emits ultraviolet light; however, much of it is absorbed by the earthâs ozone layer.icroorganisms are inactivated by UV light as a result of damage to nucleic acids. The high energy associated with short wavelength UV energy, primarily at 254 nm, is absorbed by cellular RNA and DNA.