Recent Trends in the Performance of Tungsten-Halogen and HID Low Beams in the U.S.

In the past several years, there have been major changes in many aspects of low-beam headlighting in the U.S. The changes include continuous shifts: 1) from sealed beams to aerodynamic, vehicle-specific headlamps, 2) from lens to reflector and projector optics, 3) from glass to plastic lenses, and 4) from mechanical to visual aim. Furthermore, new bulbs, both tungsten-halogen- and HID-based have been introduced. Beginning with the 1997 model year, the authors have periodically documented the influence of these technological changes on headlamp photometric performance. The 3 studies of tungsten-halogen lamps performed thus far used the same basic approach. Specifically, in these studies, the photometric output of the low beams was measured for use on the 20 or 23 (depending on the study) best selling vehicles in the U.S., and each vehicle's weighted measurements were compared with the respective sales volume to calculate the 25th, 50th, and 75th percentile market-weighted values. In 1 additional study, data was obtained for a sample of 19 HID lamps. This paper: 1) provides new data for 5 HID low beams designed for use on the 5 best selling vehicles that offered HIDs for model year 2004, and for 5 tungsten-halogen lamps for the same vehicles, 2) examines photometric trends from 1997-2004 for both tungsten-halogen and HID low beams, and 3) documents the technological changes over the same time period.

  • Availability:
  • Authors:
    • Sivak, Michael
    • Schoettle, Brandon
    • Flannagan, Michael J
  • Publication Date: 2007-1


  • English

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 19-23
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01045077
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 27 2007 7:00PM