Mercury-free HID headlamps: glare and color rendering

Show simple item record Sivak, Michael en_US
dc.contributor Schoettle, B. en_US
dc.contributor Flannagan, M. J. en_US 2007-06-20T18:34:21Z 2007-06-20T18:34:21Z 2004
dc.identifier 98464 en_US
dc.identifier.other UMTRI-2004-37 en_US
dc.identifier.other PB2005-100705 en_US
dc.description "November 2004." en_US
dc.description Includes bibliographical references (leaves 20-21) en_US
dc.description.abstract This study examined the potential effects of the spectral power distributions of mercury-free high-intensity discharge (HID) headlamps on discomfort glare for oncoming drivers and on color rendering of retroreflective traffic materials. In both cases, the effects of mercury-free HID light sources were compared to the changes in these properties that occurred when the tungsten-halogen light sources were replaced with traditional (mercury containing) HID light sources. Specifically, the effect on discomfort glare was estimated by comparing the chromaticities of 9 mercury-free headlamps with the chromaticities of 17 traditional HID headlamps. Analogously, the effects on color rendering were estimated by comparing the chromaticities of 46 retroreflective materials when illuminated by the mercury-free headlamps with the chromaticities of the same materials when illuminated by the traditional HID headlamps. The main findings are as follows: (1) The discomfort glare from the mercury-free HIDs is predicted to be comparable to that from the “bluest” of the traditional HIDs. (2) Color rendering with headlamps using the mercury-free HIDs is likely to be acceptable. (3) The use of mercury-free HIDs is unlikely to have appreciable effects on the relative brightness of colored retroreflective materials. en_US
dc.description.sponsorship Michigan University, Ann Arbor, Industry Affiliation Program for Human Factors in Transportation Safety en_US
dc.format ill. (some col.) en_US
dc.format.extent 25 en_US
dc.format.extent 461995 bytes
dc.format.mimetype application/pdf
dc.language English en_US
dc.publisher University of Michigan, Ann Arbor, Transportation Research Institute en_US
dc.subject.other Glare/ Dazzle en_US
dc.subject.other Lighting Components en_US
dc.subject.other Headlamps en_US
dc.subject.other Color/ Chromaticity en_US
dc.subject.other Reflectance/ Absorptivity/ Reflectivity en_US
dc.subject.other Oncoming Traffic en_US
dc.subject.other Drivers/ Vehicle Operators en_US
dc.subject.other Human Comfort/ Discomfort en_US
dc.subject.other Optical Spectrum en_US
dc.subject.other Mercury Vapor en_US
dc.subject.other HID Headlamps en_US
dc.title Mercury-free HID headlamps: glare and color rendering en_US
dc.title.alternative Mercury-free high-intensity discharge headlamps: glare and color rendering en_US
dc.type Technical Report en_US
dc.subject.hlbsecondlevel Transportation
dc.subject.hlbtoplevel Engineering
dc.description.bitstreamurl en_US
dc.description.bitstreamurl en_US
dc.owningcollname Transportation Research Institute (UMTRI)
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