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1、ProductLevelAcceleratedLifetimeTestforIndoorLEDLuminaires1,2,33,42,3351SauKoh,CadmusYuan,BoSun,BobLi,XuejunFan,G.Q.Zhang1DelftInstituteofMicrosystemsandNanoelectronics(Dimes),DelftUniversityofTechnology,Netherlands2BeijingResearchCenter,DelftUniversityofTechno
2、logy,Beijing,100083,China3StateKeyLaboratoryofSolidStateLighting,Beijing,100083,China4InstituteofSemiconductors,ChineseAcademyofSciences,Haidian,Beijing,100083,China5DepartmentofMechanicalEngineering,LamarUniversity,Beaumont,TX77710,USAcayuan@gmail.com,xuejun.
3、fan@lamar.eduproduct,comparedtotheconventionallightingproducts.AbstractHowever,suchlongtestingtimeishazardtothefastA2-stageaccelerationtheoryforluminousfluxgrowingLEDindustryandtechnology,underthehighdepreciationtestingatLEDlamp/luminairelevelissociety’sexpect
4、ationofLEDreplacement.Itisessentialdevelopedtoreducethetesttimefrom6,000hourstolesstodevelopproperaccelerationmethodsforLEDthan2,000hours.Suchanaccelerationtheoryisbasedonproducts,basedonilluminationandelectronicstheexponentialdecaymodelandArrheniusacceleratio
5、nrequirements.equation.Threekeyparameters,namely,activationThefirstattemptwastoreducethetestingtimebyenergy,operatingjunctiontemperature,andaccelerateddroppingtest-to-failconcept,buttestingtheLEDtestingjunctiontemperatureareobtainedfrommassiveproductsuntil70%l
6、uminousmaintenancetime,whichisprovenLM80datasets,nominaljunctiondesigndenotedasL70time.Theprincipleisbasedonthefacttemperature,andmaximumallowedambienttemperaturethatthelightoutputofaLEDproductwillgraduallyinoperatingconditions.A“mastercurve”thatdescribesdepre
7、ciateduringnormalusageand30%luminousdroptheminimumrequirementoftheluminousdecayisiswhathumaneyescandetect[1].Illuminationdefined,andthecurveisassociatedwithacertaindesignEngineeringSociety(IES)developedlamp/luminairejunctiontemperature.Suchadesignjunctiontempe
8、raturelevellumenmaintenancetestingandlumenmeasurementmatchesthemaximumjunctiontemperaturewhereLM80method[2],so-calledLM80test.EnergyStardevelopedadataareenvelopedinthemastercurve.T
