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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.
Irradiation. Just to be confusing the intensity of solar radiation is called irradiance and is measures in the units of power per unit area (W/m 2 or kW/m 2) however, the total amount of solar radiation energy is called irradiation and is measures in the units of energy per unit area (J/m 2).igure 2.1: The Sun's rays incident on the Earth. I0 = irradiance on a plane perpendicular to the Sun's rays. The solar constant (I SC) is the average radiation intensity falling on an imaginary surface, perpendicular to the Sunâs rays and at the edge of the Earthâs atmosphere (figure 2.1).