Skyglow Changes Over Tucson, Arizona, Resulting From A Municipal LED Street Lighting Conversion

•Radiative transfer modeling was used to predict skyglow changes resulting from an LED conversion.•Measurements of skyglow were made in epochs approximately bracketing the conversion effort.•Results of modeling and observations were compared against satellite “night lights”.•Some evidence supports the hypothesis that dimming LED lights reduced skyglow.•A clear need exists for further investigation of this phenomenon including constant monitoring.