Spectral Effects of High-Intensity Discharge Automotive Forward Lighting on Visual Performance

The objective of this study was to determine the role that high-intensity discharge (HID) lamp spectral distribution plays on visual performance. The study examines lamp spectral distribution by direct comparison of HID source spectra to one that simulates a conventional halogen source. This study also includes two additional lamp spectra, a “cool” distribution with a high percentage of short wavelength visible light and a “warm” distribution with a high percentage of long wavelength visible light. Subjects perform a visual tracking task, cognitively similar to driving, while seated in the driver’s seat of a test vehicle. Simultaneously, small targets located at various angles in the periphery are activated and target detection reaction times are recorded. Any reaction times greater than 1 second are considered misses in this study. Target illuminances are kept constant between the HID and halogen simulating systems, allowing the effects of spectrum to be identified and isolated.


  • English

Media Info

  • Media Type: Print
  • Edition: PT-119
  • Features: Figures; References; Tables;
  • Pagination: pp 417-424
  • Monograph Title: Recent Developments in Automotive Safety Technology

Subject/Index Terms

Filing Info

  • Accession Number: 01000095
  • Record Type: Publication
  • ISBN: 0768015030
  • Files: TRIS
  • Created Date: May 5 2005 1:45PM