Sensitivity Analysis of Headlamp Parameters Affecting Visibility and Glare

Details

• Creators:
  Hu, F ; Akashi, Yukio ; Bullough, John D.
• Corporate Creators:
  Rensselaer Polytechnic Institute. Lighting Research Center
• Corporate Contributors:
  United States. Department of Transportation. National Highway Traffic Safety Administration
• Subject/TRT Terms:
  • Glare
  • Headlamps
  • Optical systems
  • Photometry
  • Sensitivity analysis
  • Visibility
  • Headlight glare
  • Automobiles--Lighting
  • Motor vehicles--Lighting
  • Headlamp aim
  More +
• Publication/ Report Number:
  DOT HS-811 055
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• TRIS Online Accession Number:
  01126405
• Edition:
  Final Report
• Corporate Publisher:
  United States. Department of Transportation. National Highway Traffic Safety Administration
• Abstract:
  Computer-simulated evaluations were conducted to identify the extent to which driver visibility and glare are affected by headlamp light source type (e.g., tungsten-halogen or high-intensity discharge), mounting height, optical system type, alignment type, and mis-aim. Based on the results of these simulation evaluations, this study also addressed whether further limits might be considered in photometric standards for headlamps that are addressed by Federal regulations. While there appears to be an inherent conflict between visibility and glare in the photometric design of headlamps, the analyses performed here do indicate that current photometric specifications for headlamps do not always trade off visibility and glare equally (e.g., headlamps that provide equivalent forward visibility as characterized here can result in different levels of disability or discomfort glare). The findings imply that advanced (dynamic) forward-lighting systems (AFS), if they can be made practical, might be of benefit in adjusting headlamp luminous intensity distributions in various situations to maximize visibility while controlling glare within acceptable limits.
• Format:
  PDF
• Funding:
  DTNH22-05-D-01002
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/39121/dot_39121_DS1.pdf
• File Type:
  [PDF - 1.27 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:81f0d46e69d976dd8f255fb93b8a0ca5854a22e8adb7740bbb4045ca1083640e