专题篇_LED测试技术.ppt

,LED测试技术MeasurementtechnologyofLED,OUTLINE,IntroductionofphotometryfacilitiesMeasurementofLEDsMeasurementofSSLproductsColorrenderingofwhiteLEDlightsources,OUTLINE,IntroductionofphotometryfacilitiesMeasurementofLEDsMeasurementofSSLproductsColorrenderingofwhiteLEDlightsources,Photometricbench,4mlongLuminousintensity(cd)oflampsIlluminancemetersLuminancemetersAveragedLEDintensity(Aresultsvarydependingonsizeofheatsink,ambienttemp.andhowLEDismounted)Useatemperature-controlledheatsink.Setheatsinktemperatureat50C,60C,.(needtobestandardized)Useametal-corePCboardtomounttheLEDtotheheatsink.,DataExample,OUTLINE,IntroductionofphotometryfacilitiesMeasurementofLEDsMeasurementofSSLproductsColorrenderingofwhiteLEDlightsources,Incandescent,Fluorescent,15lm/W,90lm/W,SolidState(WhiteLEDs),Potential200lm/W,SolidStateLighting,DrivingForceEnergySaving,Lightingconsumes22%ofelectricity8%oftotalenergy(statisticsofUSA),SolidStateLighting,by202550%reductionofenergyconsumedbylighting10%reductioningreenhousegasemissionsCustomersavingsof$115billionannually(U.S.Dep.Energy),SSLProductsarecomingout,Nicheapplications,Generallightingapplications,U.S.Dept.ofEnergysinitiativeforSSL,DOEsLab-to-Marketstrategy,CommercializationsupportProductTestingStandardsdevelopmentLaboratoryaccreditationprogramLightingforTomorrowcompetition,DOEEnergyStarprogramforSSLproducts,SSLproductsforgeneralillumination(residentialandcommercialapplications)Designedtoensureenergyefficiency(alsoquality)relativetoexistingsourcesRequirementsforluminaireefficacy,chromaticity,andCRI(Ra75forindoorapplications)Requiresmeasurementsbyaccreditedlaboratories.isdevelopingNVLAP(NationalVoluntaryLaboratoryAccreditationProgram)programforSSLproducts.,(2nddraft4/9/2007),MeasurementofSSLproducts,Luminairesaremeasuredforrelativeluminousintensitydistributionandtotalluminousflux,normalizedbymeasuredlamptotalluminousfux,e.g.,per1000lm.Absolutescalegivenbypublishedlamplumenvalues.,Traditionalluminairephotometry(RelativePhotometry),ThismethoddoesnotworkforSSLproducts.,Lampandfixturecannotbeseparated.PublishedLEDluminousfluxvaluesarenotreliable.,SSLproducts:mostlyinaformofluminaire.,Testmethodsforlampsandluminairescombinedareneeded.,StandardizationforSSLspecificationandmeasurement,StandardsforSSLbeingdevelopedinUSAANSIC78.377SpecificationsfortheChromaticity(CDC2)IESNALM-79ApprovedmethodforelectricandphotometricmeasurementofSSLproducts(CDC2)IESNALM-80LifetestofSSLproductsInternationalstandardsbeingdevelopedCIETC1-69ColorRenditionofWhiteLightSources,Table1.,ANSIC78.377ASpecificationsfortheChromaticityofSSLproducts(Draft),ANSIC78.377Draft,FlexibleColor,IESNALM-79ApprovedMethodforElectricalandPhotometricMeasurementofSSLProducts(Draft),CoversSSLproductscompletewithelectronicsandheatsinks.-therefore,notemperatureissues(SSLproductoperatedat25Cambient).DoesnotcoverLEDmodules,LEDpackages,norindividualLEDs.AddressesbothaspectsoflampphotometryandluminairephotometryTotalluminousflux(lumen),electricalinput,luminousefficacy(lm/W)Chromaticity,CCT,CRI(4integrated)Angularintensitydistribution,Nospectralmismatchcorrectionneededforluminousflux.Totalluminousfluxandcolorquantitiesmeasuredatthesametime.Colorquantitiesmeasuredasspatially(4)averagedvalues.,Oneofthemethodsrecommended(forsmallerSSLproducts),Agoniphotometerisneededforlarge-sizeSSLproducts),IESNALM-79ApprovedMethodforElectricalandPhotometricMeasurementofSSLProducts(Draft),l,MeasurementofSSLproducts,MeasuringarefrigeratorLEDluminaire,Totalluminousflux(lm)Totalspectralradiantflux(350nmto830nm)Chromaticity,CCT,Duv,CRI(4averaged)25Cambienttemp.SSLproductsupto30cmdiameterorlinear1.5mlong.IndividualLEDsalsomeasured.,ForSSLproducts,Dataexample(LEDdownlight),MeasurementofSSLproducts,Goniospectroradiometer,IntroductionofphotometryfacilitiesMeasurementofLEDsMeasurementofSSLproductsColorrenderingofwhiteLEDlightsources,OUTLINE,LuminousEfficacyofasourcelm/W,=,RadiantEfficiency,LuminousEfficacyofRadiationlm/W,X,LuminousEfficacyofaSource(lm/W),OpticalpowerWElectricalpowerW,LuminousfluxlmOpticalpowerW,LuminousfluxlmElectricalpowerW,(ExternalQ.E.),Theoreticalmaximumlm/Wofagivensource.,Dependsonlyonspectralpowerdistribution(SPD).,Daylight,Lowpressuresodiumlamp,WhiteLED,520lm/W,400lm/W,250lm/W,Theoreticalmaximum,ColorRenderingvs.EnergyEfficiency,Excellentcolorrendering,?colorrendering,Nocolorrendering,ProblemsofCRI(1),3-LEDModelPeaksat:457,540,&605nmCRIRa=80,Ref.,LED,Thisspectrumhashigherlm/W.,Goodscoresdonotguaranteegoodsaturatedcolors,ProblemsofCRI(2),CRIpenalizeslightsourceshavingenhancedcolorcontrast.,NeodymiumincandescentlampCRIRa=77(NormalincandescentlampRa=100),Ref.,LED,Poorcorrelationofvisualevaluation(preference)ofRGBwhiteLEDsandtheCRI,Narendran,2002(SPIEProc.),63,81,25,63,82,98,CRIRavalue,“RGBLow”(460/525/635)4100KCRIRa=24,“RGBHigh”(460/525/615)4100KCRIRa=64,ReproductionofRGBwhitelightusedinNarendransexperiments,Viewedunderrealsources,Broadband,RGBR620,RGBR600,EstablishedinMay2006.Chair:WendyDavisTR:Investigatenewmethodsforassessingthecolourrenditionpropertiesofwhite-lightsourcesusedforillumination,includingsolid-statelightsources,withthegoalofrecommendingnewassessmentproced