This research develops a standard for converting solar irradiance to lux illuminance. With this conversion, a solar researcher can measure solar irradiance light spectra with a low-cost light metre. The watts per metre squared (W/m2) units are the standard for measuring solar irradiation. Irradiance metres are both expensive and incapable of measuring low irradiance values. Light metres measure luminous flux per unit area (illuminance) using lumens per metre squared or lux units, which have a lower cost and higher sensitivity in low light settings (lx). Light metres might be used to measure photovoltaic performance in low solar irradiation conditions if there was an effective conversion factor between W/m2 and lx. A review of the literature revealed that there is no definite "rule of thumb" conversion standard for solar irradiance and illuminance. Easy-to-find For 1000 W/m2 (1 Sun) of solar irradiation, Internet sites provide conflicting and considerably different numbers ranging from 688449 to 21000 lx. Luminous Efficacy comparable values in peer-reviewed literature range from 21 to 131 lx per W/m2. The link is explored in this paper, and a theoretical and laboratory measurement guide for converting solar irradiance and illuminance is established. Standards data, equipment calibration accuracy, and uncertainty estimations are all included in the conversion factor. For an LED-based solar simulator, the solar irradiance of 1 Sun (1000 W/m2) is (116 3) klx, while outside sunlight is (122 1) klx.
Author(S) Details
Peter R. Michael
Emergent Technologies Institute, Florida Gulf Coast University, Fort Myers, FL 33913, USA and University of South Florida, Tampa, FL 33620, USA.
Danvers E. Johnston
Whitaker College of Engineering, Florida Gulf Coast University, Fort Myers, FL 33965, USA.
Wilfrido Moreno
Department of Electrical Engineering, University of South Florida, Tampa, FL 33620, USA.
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