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Mercury-free HID headlamps: glare and color rendering

dc.contributor.authorSivak, Michaelen_US
dc.contributor.authorSchoettle, B.en_US
dc.contributor.authorFlannagan, M. J.en_US
dc.date.accessioned2007-06-20T18:34:21Z
dc.date.available2007-06-20T18:34:21Z
dc.date.issued2004
dc.identifier98464en_US
dc.identifier.otherUMTRI-2004-37en_US
dc.identifier.otherPB2005-100705en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/55201
dc.description"November 2004."en_US
dc.descriptionIncludes bibliographical references (leaves 20-21)en_US
dc.description.abstractThis 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.sponsorshipMichigan University, Ann Arbor, Industry Affiliation Program for Human Factors in Transportation Safetyen_US
dc.formatill. (some col.)en_US
dc.format.extent25en_US
dc.format.extent461995 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.publisherUniversity of Michigan, Ann Arbor, Transportation Research Instituteen_US
dc.subject.otherGlare/ Dazzleen_US
dc.subject.otherLighting Componentsen_US
dc.subject.otherHeadlampsen_US
dc.subject.otherColor/ Chromaticityen_US
dc.subject.otherReflectance/ Absorptivity/ Reflectivityen_US
dc.subject.otherOncoming Trafficen_US
dc.subject.otherDrivers/ Vehicle Operatorsen_US
dc.subject.otherHuman Comfort/ Discomforten_US
dc.subject.otherOptical Spectrumen_US
dc.subject.otherMercury Vaporen_US
dc.subject.otherHID Headlampsen_US
dc.titleMercury-free HID headlamps: glare and color renderingen_US
dc.title.alternativeMercury-free high-intensity discharge headlamps: glare and color renderingen_US
dc.typeTechnical Reporten_US
dc.subject.hlbsecondlevelTransportation
dc.subject.hlbtoplevelEngineering
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/55201/4/98464.pdfen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/55201/1/UMTRI-2004-37.pdfen_US
dc.owningcollnameTransportation Research Institute (UMTRI)


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