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1、Optik121(2010)1761–1765ContentslistsavailableatScienceDirectOptikjournalhomepage:www.elsevier.de/ijleoOpticaldesignofafreeformTIRlensforLEDstreetlightJinboJiang,SandyTo,W.B.Lee,BennyCheungAdvancedOpticsManufacturingCentre,GH040,DepartmentofIndustryandSyst
2、emsEngineering,TheHongKongPolytechnicUniversity,HungHom,Kowlong,HongKongarticleinfoabstractArticlehistory:SecondaryopticsisacriticalcomponentdeterminingtheoutputefficiencyandlightdistributionoftheReceived18December2008LEDstreetlight.Agoodroadwayillumination
3、requirestheLEDstreetlighthavearectangularlightAccepted23April2009patternjustcovertheroadwayandwithoutexcessspilllightcreepingintoyardsandshiningintowindowsofneighborresidents.TheadoptionoftheunsymmetricalfreeformopticswithdifferentlightKeywords:distributio
4、nsalongXandYdirectionsisnecessary.ThewholeLEDstreetlightcanbeconstructedifonlyLEDstreetlightmountstheseLEDmodulesontheplanarPCBplate.Themechanism,thermalmanagement,andtheFreeformlenspowercontrolelectronicsoftheLEDstreetlightbecomeverysimple.Inthispaper,ano
5、pticaldesignSecondaryopticsapproachofafreeformTIR(totalinternalreflection)lensfortheLEDstreetlightisinvestigated.WithTIRthesefreeformlenses,highoutputefficiency,evenlightdistribution,andbatwingfarfieldbeamangleLightdistributiondistributioncanbeachieved.&2009E
6、lsevierGmbH.Allrightsreserved.1.Introductionbenefitthatiscapableofeliminatingglare,hotspotsandrelatedvisibility,safetyandenergy-wastingproblems.EvenlightLEDlightingisregardedasanewenergy-savingstrategyin21stdistributionimprovesthestreetlightingfunctionandcr
7、eatesacentury.ManycitiesacrossChina,Europe,andNorthAmericaarebetterenvironmentforpeopleandvehicles.LEDstreetlightscanexperimentingwithLEDstreetlights.TheLEDstreetlightsprovidealsobeshiftedtowardeithertheredortheblueendoftheamuchlongerlifetime(morethan5time
8、slongerthanMHandspectruminordertomatchdifferentwavelengthsoflighttotheHPSlamps),morecontrollableandefficientformoflightingthandifferentlightingrequirementsofspecifictimesofdayandnight,incandescentsources.LEDsol
