IMPROVED LOW-BEAM PHOTOMETRICS

It is recognized that low-beam headlamps do not provide adequate illumination for safe operation at higher speeds. This report summarizes Task 1 activities on a contract the ultimate aim of which is to provide specifications for an improved low-beam headlighting system. A comprehensive review of the literature was carried out. Additional studies were conducted to provide information lacking in the available literature. Based on these data and the use of a computerized seeing-distance model, modifications to the present low-beam headlighting system were suggested, which should improve visibility distances under most driving conditions. A number of additional analyses have been carried out to determine whether the proposed beam modifications would cause problems under certain common driving conditions. For example, consideration was given to the effects of beam misaim, changes in mounting height, and adverse weather. None of the conditions examined appears to pose an overwhelming problem for the new beam system. The report concludes with a consideration of ways in which the new beam might be realized in hardware. There are a variety of ways in which this might be accomplished, all of which have advantages and disadvantages.

  • Corporate Authors:

    University of Michigan Transportation Research Institute

    2901 Baxter Road
    Ann Arbor, MI  United States  48109-2150

    National Highway Traffic Safety Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Olson, P L
    • Sivak, M
  • Publication Date: 1983-3

Media Info

  • Features: Appendices; Figures; Tables;
  • Pagination: 107 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00393071
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: UM-HSRI-81-4 Intrm Rpt., HS-806 487
  • Contract Numbers: DOT-HS-9-02304
  • Files: HSL, TRIS, USDOT
  • Created Date: Mar 29 1985 12:00AM