The most basic LED energy saving lamp basic knowledge universal household lighting
发布时间 : 2016-12--27
点击量 : 3
Nowhomedecoration,LEDisnowpeopleusemostofthehomelights,itisakindofelectricalenergycanbeconvertedintolightenergyelectronicdeviceswiththecharacteristicsofthediode.Atpresent,differentlight-emittingdiodescanemitlightfromdifferentwavelengthsofinfraredtoblue,thecurrentissueofpurpleandultravioletlighthasalsobeenthebirthoflight-emittingdiodes.InadditiontotheblueLEDcoatedwithphosphor,thebluelightintowhitelightwhiteLED.LEDcolorandtechnology:TheLEDismadeofdifferentmaterials,canproducephotonswithdifferentenergies,whichcancontroltheLEDemittedbythewavelengthoflight,thatis,thespectrumorcolor.ThefirstLEDusedinthehistoryofthematerialisarsenic(As)gallium(Ga),thepositivePNjunctionpressuredrop(VF,canbeunderstoodaslitorworkingvoltage)is1.424V,thelightemittedfortheinfraredspectrumTheAnothercommonlyusedLEDmaterialforthephosphorus(P)gallium(Ga),thepositivePNjunctionvoltagedropof2.261V,thelightisgreen.Basedonthesetwomaterials,theearlyLEDindustryusesGaAs1-xPxmaterialstructure,theoreticallycanproducefrominfraredlighttoanywavelengthwithinthegreenlightoftheLED,thesubscriptXrepresentsthephosphoruselementtoreplacethepercentageofarsenicelements.GenerallythroughthePNjunctionvoltagedropcandeterminethewavelengthofLEDcolor.WhichtypicallyGaAs0.6P0.4redLED,GaAs0.35P0.65orangeLED,GaAs0.14P0.86yellowLEDandsoon.Asaresultofthemanufactureofgallium,arsenic,phosphorusthreeelements,socommonlyknownasthesethreeelementsLEDtube.TheGaN(galliumnitride),GaPgreenLEDandGaAsinfraredlightLED,knownasthetwo-elementLED.Thelatesttechnologyisafour-elementLEDmadeofAlGaInN,amixtureofaluminum(Al),calcium(Ca),indium(In)andnitrogen(N),whichcoversallvisibleandpartialUVThespectralrangeoflight.LEDluminousintensity:Luminousintensityunit(candlelightCandlepower)1CD(candlelight)referstothecompleteradiationoftheobject,intheplatinumfreezingpointtemperature,everysixtiethofthelightoftheunit,theluminousintensityunit(lumensLumen)Squarecmareaoftheluminousintensity.(Inthepastreferstoadiameterof2.2cm,75.5gramsofwhaleoilcandles,burning7.78gramsperhour,theflameheightof4.5cm,alongthehorizontaldirectionoftheluminousintensity)1L(lumens)means1CDcandlelightatadistanceof1cm,Theareaof1squarecentimeterontheplaneoftheluminousflux.1Lux(lux)refersto1Loftheluminousfluxevenlydistributedintheareaof1squaremetersofillumination.GeneralactiveluminousbodywithluminousintensityunitcandlelightCD,suchasincandescentlamp,etc.;reflectiveorpenetratingtypeofobjectusingluminousfluxunitLumensL,suchasLCDprojector,etc.;andilluminationunitLuxLuxLux,generallyusedforphotographyandotherfields.Thethreeunitsofmeasurearenumericallyequivalent,butneedtobeunderstoodfromdifferentperspectives.Forexample,ifanLCDprojectorhasabrightness(luminousflux)of1600lumens,itsprojectedtoafullreflectionscreensizeof60inches(1squaremeter),theilluminationof1600lux,assumingitsoutputfromthelightsource1Cm,theopticalportareaof1squarecentimeter,thentheopticalportoftheluminousintensityof1600CD.TherealLCDprojectorduetothelossoflighttransmission,reflectionorlighttransmissionfilmlossandunevenlightdistribution,brightnesswillbegreatlyreduced,generally50%efficiencyisverygood.Inactualuse,theintensitycalculationisoftenusedinrelativelyeasymappingofdataunitsorchangetouse.FortheLEDdisplayThisactiveluminousbodyisgenerallyusedCD/squaremetersastheluminousintensityunit,andwiththeobservationanglefortheauxiliaryparameters,whichisequivalenttothesurfaceofthescreenunitilluminationunitlux;thisvalueandthescreeneffectivedisplayareaMultiplytoobtaintheluminousintensityoftheentirescreenatthebestviewingangle,assumingthattheluminousintensityofeachpixelinthepanelisconstantwithinthecorrespondingspace,thisvaluecanbeconsideredastheluminousfluxoftheentirescreen.Thegeneraloutdoortobemorethan4000CD/squaremetersofbrightnessinthesuncanhaveabetterdisplay.OrdinaryindoorLED,themaximumbrightnessof700~2000CD/squaremeters.TheluminousintensityofasingleLEDisinCDunits:Atthesametimewithaviewingangleparameters,luminousintensityandLEDcolordoesnotmatter.TheluminousintensityofasingletuberangesfromseveralmCDtofivethousandmCD.LEDmanufacturersgiventheluminousintensityofLEDlightinthe20mAlight,thebestviewingangleandthecentrallocationoftheluminousintensityofthelargestpoint.TheshapeofthetoplenswhentheLEDisencapsulatedandthepositionoftheLEDchipfromthetoplensdeterminestheLEDviewingangleandlightintensitydistribution.Generallyspeaking,thelargertheLEDviewingangleis,thesmallerthemaximumluminousintensityis,buttheaccumulatedluminousfluxonthewholethree-dimensionalhemispheredoesnotchange.Whenanumberofmoretightlydistributed,theluminoussphericalobjectsaresuperimposedoneachother,resultingintheuniformdistributionoftheluminousintensitydistributionoftheentireluminousplane.Incalculatingtheluminousintensityofthedisplay,accordingtotheLEDviewingangleandLEDdischargedensity,themanufacturerwillprovidethemaximumluminousintensityvaluemultipliedby30%to90%range,astheaveragesingle-tubeluminousintensity.LEDluminouslifeisverylong:Manufacturersaregenerallymarkedas100,000hoursormore,theactualshouldalsopayattentiontotheLEDbrightnessattenu