Effects of Realistic Levels of Dirt on Light Output of Rear Signal Lamps

摘要

This study evaluated changes in the light output of stop lamps as a function ofdirt accumulated during a 482-km route, representing a 10-day amount of driving for a typical U.S. driver. The complete route was traversed on three separate occasions, under each the following conditions: dry, wet, and snowy with road salt. Photometry for each of two stop lamps was performed twice after the completion of each drive, first 'as is' and then after cleaning. Photometric information was obtained for all current U.S. and European test points.