SAE-J578-2002-Color-Specification

SAETechnicalStandardsBoardRulesprovidethat:“ThisreportispublishedbySAEtoadvancethestateoftechnicalandengineeringsciences.Theuseofthisreportisentirelyvoluntary,anditsapplicabilityandsuitabilityforanyparticularuse,includinganypatentinfringementarisingtherefrom,isthesoleresponsibilityoftheuser.”SAEreviewseachtechnicalreportatleasteveryfiveyearsatwhichtimeitmaybereaffirmed,revised,orcancelled.SAEinvitesyourwrittencommentsandsuggestions.Copyright©2002SocietyofAutomotiveEngineers,Inc.Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystemortransmitted,inanyformorbyanymeans,electronic,mechanical,photocopying,recording,orotherwise,withoutthepriorwrittenpermissionofSAE.TOPLACEADOCUMENTORDER:Tel:[phone](insideUSAandCanada)Tel:[phone](outsideUSA)Fax:[phone]Email:[e-mail]:(R)ColorSpecification1.Scope—ThisSAEStandarddefinesandprovidesameansforthecontrolofcolorsemployedinmotorvehicleexternallightingequipment,includinglampsandreflexreflectors.Thedocumentappliestotheoveralleffectivecoloroflightemittedbythedeviceinanygivendirectionandnottothecolorofthelightfromasmallareaofthelens.Itdoesnotapplytopilot,indicator,ortell-talelights.2.References2.1ApplicablePublications—Thefollowingpublicationsformapartofthisspecificationtotheextentspecifiedherein.Unlessotherwiseindicated,thelatestissueofSAEpublicationsshallapply.2.1.1SAEPUBLICATIONS—AvailablefromSAE,400CommonwealthDrive,Warrendale,PA15096-0001.SAEJ578JUN1995—ColorSpecificationforElectricSignalLightingDevicesSAEJ774—EmergencyWarningDeviceSAEHS34—SAEGroundVehicleLightingStandardsManual2.1.2FEDERALPUBLICATIONS—AvailablefromtheSuperintendentofDocuments,U.S.GovernmentPrintingOffice,Washington,DC20402-9371.FMVSSNo.125—WarningDevices,39FR28636,Aug.9,1974asamendedat40FR4,Jan.2,1975FMVSS1082.1.3ASTMPUBLICATION—AvailablefromASTM,100BarrHarborDrive,WestConshohocken,PA19428-2959.ASTME308-99—MethodforComputingtheColorsofObjectsbyUsingtheCIESystem2.1.4CIEPUBLICATION—AvailablefromCommissionInternationaledeL’eclairage,52BdMalesherbes,F-75008Paris,France.CIE1931Standard—ColorimetrySAEJ578RevisedJUL2002-2-3.Definitions3.1ChromaticityCoordinates—ThefundamentalrequirementsforcolorareexpressedaschromaticitycoordinatesaccordingtotheCIE(1931)standardcolorimetricsystem(seeFigure1).Thefollowingrequirementsshallapplywhenmeasuredbythetristimulusorspectrophotometricmethods.FIGURE1—CHROMATICITYDIAGRAM3.1.1RED—Thecoloroflightemittedfromthedeviceshallfallwithinthefollowingboundaries:y=0.335(yellowboundary)y=0.980-x(purpleboundary)3.1.2YELLOW(AMBER)—Thecoloroflightemittedfromthedeviceshallfallwithinthefollowingboundaries:y=0.390(redboundary)y=0.790-0.670x(whiteboundary)y=x-0.120(greenboundary)SAEJ578RevisedJUL2002-3-3.1.2.1SelectiveYellow(SeeA.2Appendix)—Thecoloroflightemittedfromthedeviceshallfallwithinthefollowingboundaries:y=0.580x+0.140(redboundary)y=1.290x-0.100(greenboundary)y=0.970-x(whiteboundary)3.1.3WHITE(ACHROMATIC)—Thecoloroflightemittedfromthedeviceshallfallwithinthefollowingboundaries:x=0.300(blueboundary)x=0.500(yellowboundary)y=0.150+0.640x(greenboundary)y=0.050+0.750x(purpleboundary)y=0.440(greenboundary)y=0.380(redboundary)3.1.3.1WhitetoYellow—Thecoloroflightemittedfromthedeviceshallfallwithinoneofthefollowingareas:a.Thatdefinedin3.1.2Yellow.b.Thatdefinedin3.1.2.1SelectiveYellow.c.Thatdefinedin3.1.3White.d.TheareabetweenYellow,SelectiveYellow,andWhiteasshownbythedashedlineinFigure1.3.1.4GREEN—Thecoloroflightemittedfromthedeviceshallfallwithinthefollowingboundaries:y=0.730-0.730x(yellowboundary)x=0.630y-0.040(whiteboundary)y=0.500-0.500x(blueboundary)3.1.5BLUE—Thecoloroflightemittedfromthedeviceshallfallwithinthefollowingboundaries:3.1.5.1RestrictedBlue—Thiscolorshouldbeelectedwhenrecognitionofblueassuchisnecessary.y=0.070+0.810x(greenboundary)x=0.400-y(whiteboundary)x=0.130+0.600y(violetboundary)3.1.5.2SignalBlue—Thiscolormaybeelectedwhen,duetootherfactors,itisnotalwaysnecessarytoidentifyblueassuch.y=0.320(greenboundary)x=0.160(whiteboundary)x=0.400-y(whiteboundary)x=0.130+0.600(violetboundary)SAEJ578RevisedJUL2002-4-4.TestMethods4.1MethodofColorMeasurement—Oneofthemethodslistedin4.1.1or4.1.2shallbeusedtocheckthecolorofthelightfromthedeviceoritsopticalcomponentsforcompliancewiththecolorspecifications.Thedeviceshallbeoperatedatthedesigntestvoltage.Components(bulbs,caplenses,andthelike)shallbetestedinafixtureorinamannersimulatingtheintendedapplication.Inmeasuringthecolorofreflexdevices,precautionsshallbemadetoeliminatethefirstsurfacereflectionsoftheincidentlight.Lightingdevicesthatarecoveredwithneutraldensityfiltersshallbetestedforcolorwithsuchfiltersinplace.4.1.1TRISTIMULUSMETHOD—Inthismethod,photoelectricdetectorswithspectralresponsesthatapproximatethe1931CIEstandardspectraltristimulusvaluesareusedtomakethecolormeasurements.Thesemeasuredtristimulusvaluesareusedtocalculatethechromaticit