光学、电学和热特性的判定在半导体照明测量中的重要性及解决方案

半导体照明的光、电、热测量基础及标准于立民ApplicationEngineeringManager,LabsphereChina肖冬GeneralManager,LabsphereChinaLabsphere公司信息•隶属于豪迈集团Halmap.l.c.•豪迈光电部分子公司–OceanOptics–FiberguideIndustries•成立于1979•ISO9001:2000certified•80,000sq.ft.facilityinNewHampshire•在上海建立销售办公室及工厂。光测量设备光测量设备光测量设备光测量设备材料和涂层材料和涂层材料和涂层材料和涂层光谱仪器配件光谱仪器配件光谱仪器配件光谱仪器配件均匀光源系统均匀光源系统均匀光源系统均匀光源系统LED、激光、灯具等测量系统漫反射标准板，材料和涂层光谱仪和相关配件等CCD、相机、探测器等校准标定EnergystarProblems/ConcernsintheIndustry*•Someverylowqualityproductsinthemarket(dim,shortlife,badcolor).•Inaccurateperformanceclaims•Insufficientinformationonproductlabels•Manyquestionsoncolorquality(rendering)•LightingdesignersstilldonottrustSSLproducts.Theysaymorestandardsareneeded.•Stillhighcost(butgovernmentincentivestouseSSLproductsarehigh.)*USDOEisaddressingtheseproblemswiththeEnergyStar,CALiPERandotherprograms.USDOELaboratorytoMarketSupportDOESSLEnergyStarRequiredstandardsfor•Testmethodandmeasurement…….…….…IESNALM-79•Chromaticityspecification…………………….ANSIC78.377•TestmethodforlifetimeofLEDs…..…….….IESNALM-80•Laboratoryaccreditationformeasurement..NVLAPEELP-SSL•Terminology…………...ANSI/IESNARP-16addendumaProgramstartedfromSep.30,2008.SSLEnergyStarSpecificationsL-Prize–DOE(LM-80)LifetimeTests•Manufacturerstosubmit200lampsforlumen/lifetimetestsatPNNL•$1MillionPrizeforbestperformingproduct.ShanghaiLED
TestmethodusedforDOESSLEnergyStar
CoversLEDluminairesandintegratedLEDlamps.
Coversmeasurementsof•Totalluminousflux(lumen)•Luminousefficacy(lm/W)•Chromaticity,CCT,CRI(4πintegrated)•Luminousintensitydistributions
Methodsusing•Sphere-spectroradiometer•Sphere-photometer•GoniophotometerIESNALM-79ApprovedMethodforElectricalandPhotometricMeasurementsofSSLProducts
LEDsourcesgenerallycannotbeseparatedfromLEDluminairesbyusers.
Theluminousefficacy(lm/W)ofthewholeluminaire(called“Luminaireefficacy”)needstobemeasuredandevaluated.
Traditionallampluminairesarecommonlymeasuredrelativetomeasuredluminousfluxofthebarelamp(s)usedintheluminaire(Relativephotometry),whichdoesnotworkforLEDluminaires.
Luminousefficacy(thus,totalluminousflux)ofsmallLEDluminairescanbemeasuredinasimilarwayasLEDlamps.PointstoNoteTotalspectralradiantfluxstandardlamp4πgeometry2πgeometry(1)MethodusingaspherespectrometerTotalluminousfluxstandardlamp4πgeometry2πgeometryIESNALM-79(2)MethodusingaspherephotometerUncertaintyofSphereBasedMeasurements•NISTUncertaintyinSphere-BasedMeasurements(BestonEarth)–+/-1%(2σ)LumensforWhiteLEDproducts–+/-0.001xandy(2σ)ChromaticityforWhiteLEDProducts•BestPracticalSecondaryLaboratoryUncertainty–+/-1.5-2%(2σ)LumensforWhiteLEDproducts–+/-0.002xandy(2σ)ChromaticityforWhiteLEDProducts•CommercialLaboratories–+/-3%(2σ)LumensforWhiteLEDproducts–+/-0.003xandy(2σ)ChromaticityforWhiteLEDProducts•GoodIndustryLaboratoriesandQC–+/-5%(2σ)LumensforWhiteLEDproducts–+/-0.005xandy(2σ)ChromaticityforWhiteLEDProducts•PracticalProductionTesting10%•Allabovenumbersarebasedonspectralmeasurements.14Source:Y.OhnofromLED2008ConferenceSSLIntegratingSpherePhotometer&AccessoriesExamplesRotatingSphere-HowPractical?SpectraflectCoatingAlternateSolutionBenefits•SmallerFootprint•Accurate:Canmountsampleincenterofhemisphereplaneandassociatedcontrol/coolingelectronicsoutsideofmeasurementarea•Orientation:Testinsameorientationitwillbeused•2xopticalefficient能源之星认可进行积分球系统测量的实验室(斜体蓝字的为采用Labsphere积分球系统的实验室)•Intertek-Cortland,NY•LuminaireTestingLaboratoryInc.–Allentown,PA•LightingSciencesInc.–Scottsdale,AZ•OnSpeX/CSAInternational–Atlanta,GA•OrbOptronixInc.–Kirkland,WA•AuroraInternationalTestingLaboratory–Aurora,OH•IndependentTestingLaboratoriesInc.–Boulder,CO标准价值–成为美国能源之星指定检测实验室的光测量主要供应商,选择Labsphere可以大大提升贵司在行业内的地位并和国际认可实验室使用同一检测平台OtherSSLEmergingStandardsShanghaiLED•HighpowerLED:anLEDdevicethatrequiresaheatsinkorothertypeofthermalmanagementasanintegralpartoftheoperation.•CoversLEDpackagesandLEDarrays,whiteLEDsaswellassinglecolorLEDs.•CoversmeasurementsinpulsemodeaswellasDCmode(NISTmethod)•Thermalconditionssetatajunctiontemperature.•Coversmeasurementsof–Totalluminousflux(lumen)–Luminousefficacy(lm/W)–Totalradiantflux(W)–Chromaticity,CCT,CRIIESNALM-xxApprovedMethodforElectricalandPhotometricMeasurementofHighPowerLEDsGoalformeasurementofhigh-powerLEDsElectricalConsiderations•ACPower:0.2%(2σ)RegulationonVoltageorCurrent–CalibrationofACpowermeter0.5%(2σ)•DCpower:0.2%(2σ)RegulationonVoltageorCurrent–CalibrationofDCpowermeter0.1%(2σ)•MeasurementofVoltageandCurrenttoprovideWallPowerandLuminousEfficacy(Lumens/ElectricalWatts).•Mayrequiresplitsockets(KelvinSockets)and/orcalibratedshuntforpropercurrentmeasurements.•Vf(ForwardVoltage)ofSSLlightingshouldbebetterthan1mVforsinglehighpowerdevicestomatchnewLM-XXhighpowerLEDstandardscomingout.VfneededtoderiveJunctionTemperature(Tj)•PWMandAC-DrivenLEDstreatedas“SteadyState”–Fornow…24Example:Keithley2400ThermalConsiderations•AnyonewhohasdesignedLEDproductsknowsthatthermalcontrolisessentialtolumenoutputandproductstability(Lifetime).•LM-79andLM-80makereferencetocontrollingtemperatureonfinalproducts:–DeviceTemperature–measuredatCaseTemperature(Ts)–AmbientTempe