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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.
Everyone is exposed to UV radiation from the sun and an increasing number of people are exposed to artificial sources used in industry, commerce and recreation. Emissions from the sun include visible light, heat and UV radiation. The UV region covers the wavelength range 100-400 nm and is divided into three bands: 1  UVA (315-400 nm). 2  UVB (280-315 nm). 3  UVC (100-280 nm).