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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 Germicidal Lighting utilises the short wavelength of UV that is harmful to forms of life at the micro-organic level. It is effective in destroying the nucleic acids in these organisms so that their DNA is disrupted by the UV radiation, which is a form of ionising radiation.ltraviolet Germicidal Irradiation. (UV) Ultraviolet germicidal is a sterilization method that uses ultraviolet (UV) light at sufficiently short wavelength to break down micro-organisms.