Performance of the first generation of HID headlamps in the U.S.

Show simple item record Sivak, Michael en
dc.contributor Flannagan, M. J. en
dc.contributor Schoettle, B. en
dc.contributor Nakata, Y. en 2007-02-16T18:59:20Z 2007-02-16T18:59:20Z 2002
dc.identifier 95818 en
dc.identifier.other UMTRI-2002-14 en
dc.identifier.other PB2002-107999 en
dc.description Includes bibliographical references (p. 22) en
dc.description.abstract This analytical study compared the median beam pattern of a sample of 19 HID low beams manufactured for model year 2000 vehicles sold in the U.S. with a market-weighted median beam pattern of tungsten-halogen lamps for vehicles of the same model year. The results indicate that the HID lamps tended to provide wider beam patterns than did the tungsten-halogen lamps, which, in turn, should improve the visibility of pedestrians on curves and may make the lane-maintenance task less demanding. On right curves, there was an increase in glare illumination towards oncoming drivers, while on left curves there was a decrease in glare illumination. On straight roads, the HID lamps produced more illumination for pedestrians and road delineation on the left side of the road. This was also the case for the right side of the road, but only for the projector HID lamps; the nonprojector HID lamps produced less illumination at the relevant locations than did the tungsten-halogen lamps. Finally, on straight roads HID lamps produced less glare for oncoming drivers than did the tungstenhalogen lamps. The results for traffic-sign illumination varied with the location of the sign. HID lamps produce more light than do tungsten-halogen lamps. Consequently, they hold great promise for improving the nighttime safety of driving by improving the lowbeam light distribution. The present analysis indicates that this promise has already been partially met in the first generation of HID lamps on vehicles in the U.S. en
dc.description.sponsorship Michigan University, Ann Arbor, Industry Affiliation Program for Human Factors in Transportation Safety en
dc.format ill. en
dc.format.extent 26 en
dc.format.extent 1965300 bytes
dc.format.mimetype application/pdf
dc.language English en
dc.publisher University of Michigan, Ann Arbor, Transportation Research Institute en
dc.subject.other Headlamps en
dc.subject.other Headlamp Aim en
dc.subject.other Passing Lamps en
dc.subject.other Lowbeam Headlamps en
dc.subject.other Front Lighting Systems en
dc.subject.other Glare/ Dazzle en
dc.subject.other Brightness/ Light Intensity/ Illumination en
dc.subject.other Visibility en
dc.subject.other Pedestrians en
dc.subject.other Guide Signs/ Delineation Signs en
dc.subject.other Road Geometrics en
dc.subject.other United States en
dc.subject.other HID Headlamps en
dc.title Performance of the first generation of HID headlamps in the U.S. en
dc.title.alternative Performance of the first generation of high intensity discharge headlamps in the U.S en
dc.title.alternative Performance of the first generation of HID headlamps in the United States en
dc.title.alternative Performance of the 1st generation of HID headlamps in the U.S en
dc.type Technical Report en_US
dc.subject.hlbsecondlevel Transportation
dc.subject.hlbtoplevel Engineering
dc.description.bitstreamurl en_US
dc.owningcollname Transportation Research Institute (UMTRI)
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