CPL_34_1_10_0049_34A_1404_DC

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1、PRIVATECIRCULATIONCPL/34/1_10_004934A/1404/DCForIECuseonly2010-07-30INTERNATIONALELECTROTECHNICALCOMMISSIONTechnicalcommittee34:LampsandrelatedequipmentSub-committee34A:LampsDocumentforComment:ProposalforaPASon'LED-Testingandpredictionoflumenmaintenance'D

2、earcolleagues,AttachedpleasefindaproposalforaPASon'LED-Testingandpredictionoflumenmaintenance'NationalcommitteesarerequestedtosendtheircommentsonthisproposalelectronicallyonIEC'formcomments'totheCentralOfficeusingtheelectronicvotingsyste

3、mbynolaterthan-10September2010-Mr.B.BorchertSecretaryIECSC34AE-mail:Bernd.Borchert@bsi-global.com234A/1404/DCIntroduction(notpartoftheproposal)ForLEDproducts,oftenlifetimeclaimsbeyondeconomicalreal-timetestingaremade.Thusanurgentmarketneedforastandardizedmethodforlumenmain

4、tenancepredictionisacknowledged.ProposalforaPAS(seefollowingpages)334A/1404/DC1ScopeThisPASspecifiesamethodforthemeasurementandpredictionoflumenmaintenanceofLEDcomponents.Asfarasfeasible,thisPASmaybeappliedforthemeasurementandpredictionoflumenmaintenanceofotherLEDbasedprod

5、ucts,suchasLEDmodules,LEDlampsandLEDluminaires.2NormativereferencesThefollowingreferenceddocumentsareindispensablefortheapplicationofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendmen

6、ts)applies.IEC/TS62504,TermsanddefinitionsforLEDsandLEDmodulesingenerallighting3TermsandDefinitionsFortermsanddefinitionsinthefieldofLED,referenceismadetoIEC/TS62504,inadditionthefollowingdefinitionsaregiven:3.1lumenmaintenanceluminousfluxatagiventimeinthelifeofanLEDdivide

7、dbytheinitialvalueoftheluminousfluxoftheLEDandexpressedasapercentageoftheinitialluminousflux(IEC/PAS62612,modified)3.2casetemperaturetstemperatureofthethermocoupleattachmentpointontheLEDlightsourceasdefinedbythemanufacturer(IESLM-80-08,modified)4Procedureforlifetimepredict

8、ion4.1BasicassumptionTheprocedurespecifiedin4.2and4.3isbasedonthebasicassumptionthatageingcanbeacceleratedbyraisingthetemperature.4.2Measuremen