This study examined the potential effects of the spectral power distributions of mercury-free high-intensity discharge (HID) headlamps on discomfort glare for oncoming drivers and on color rendering of retro reflective traffic materials. In both cases, the effects of mercury-free HID light sources were compared to the changes in these properties that occurred when the tungsten-halogen light sources were replaced with traditional (mercury containing) HID light sources. Specifically, the effect on discomfort glare was estimated by comparing the chromaticity of 9 mercury-free headlamps with the chromaticity of 17 traditional HID headlamps. Analogously, the effects on color rendering were comparing the chromaticities of 46 retro reflective materials when illuminated by the mercury-free headlamps with the chromaticity of the same materials when illuminated by the traditional HID headlamps.


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    Title :

    Mercury-Free HID Headlamps: Glare and Color Rendering


    Contributors:
    M. Sivak (author) / B. Schoettle (author) / M. J. Flannagan (author)

    Publication date :

    2004


    Size :

    36 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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