The study evaluated subjects' impressions of performance of high-intensity discharge (HID) headlamps after in-traffic experience, with a special emphasis on color appearance of stop signs. In the first of two tasks, subjects drove (or rode) 19 km through a variety of roadway environments in a car equipped with either HID or tungsten-halogen low-beam headlamps. Instructions to the subjects did not mention color appearance. The second task involved a head-to-head comparison of HID and tungsten-halogen headlamps. In the task, subjects drove (or rode) twice along a 4-km route in a residential area, and they were instructed to pay special attention to the color appearance of stop signs and other objects. The main finding from Task 1 is that subjects who experienced HID headlamps did not report more (or fewer) spontaneous negative comments on color appearance of stop signs or other objects than did subjects who experienced tungsten-halogen headlamps. Furthermore, the evaluations of overall performance of the two types of headlamps were very similar. In the head-to-head comparison in Task 2 there was no evidence of problems with color appearance when using HID headlamps. Furthermore, subjects preferred HID headlamps in terms of overall performance, and in making stop signs and other objects stand out from their background. However, the preference for HID headlamps was present only for subjects who had the relatively extended exposure to the HID headlamps in Task 1. The results of the study provide no evidence of problems with color appearance of stop signs and other objects when using HID headlamps.


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    Title :

    In-Traffic Evaluations of High-Intensity Discharge Headlamps: Overall Performance and Color Appearance of Objects


    Contributors:
    M. Sivak (author) / M. J. Flannagan (author) / E. C. Traube (author) / D. S. Battle (author) / T. Sato (author)

    Publication date :

    1993


    Size :

    26 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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