Vehicle lamp lens color affects the luminance and perceived brightness of lamps with equal light source output. This has implications for proposals suggesting differentiating rear lighting on vehicles by color because any change in lens color will also change perceived brightness and luminance. This confound could negate or enhance benefits of color coding lamps. This study uses methods related to the visual search paradigm which are often ignored in this type of research but provide novel sources of information. Results indicate that luminance changes due to color changes in tail lamps did not adversely affect RT or error in identifying brake lamps.
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