led照明基本规格参数

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1、LEDLightingDefinitionsandCharacteristicsTND328/DRev.1–Sep07Definitions2TND328/DRev.1–Sep07LuminousFlux[lm]•Luminousfluxisthequantityoftheenergyofthelightemittedpersecondinalldirections.Theunitofluminousfluxislumen(lm).Onelumenistheluminousfluxoftheuniformpoin

2、tlightsourcethathasluminousintensityof1candelaandiscontainedinoneunitofspatialangle(or1steradian).Steradianisthespatialanglethatlimitsthesurfaceareaofthesphereequaltothesquareoftheradius.Thisconceptisshowninthefigurefor1mradiusofthesphere.Sincetheareaofsphere

3、is4πr²thentheluminousfluxofthepointlightsourceis4πlumens.Pointsourcewithuniformlightand1candela[cd]ofluminousintensity.1lumenofArea=1Luminoussquaremeterflux1meterradius3TND328/DRev.1–Sep07LuminousIntensity[cd]•Theluminousintensity(measuredincandelas)istheamou

4、ntoflightemittedintoacertaindirection,measuredin1mdistance.•IfthepointlightsourceemitsØlumensintoasmallspatialangleß,theluminousintensityisI=Ø/ß.Theunitofluminousintensityiscandela.Thereisastandardthatdetailsthecandeladefinition.Thisincludesthestandardlightso

5、urceandthephysicalconditionsofthemeasurement.4TND328/DRev.1–Sep07•Luminousintensityisnotonlydrivenbytheluminousflux,butalsobytheoptics,whichmakesthelightmoreorlessfocused.5TND328/DRev.1–Sep07Illuminance•Thisdefinitiondeterminestheamountoflightthatcoversasurfa

6、ce.IfØistheluminousfluxandSistheareaofthegivensurfacethentheilluminanceEisdeterminedbyE=Ø/S.TheunitofilluminationinSIsystemislux[lx],andinfoot-poundsystemitisfoot-candle.Onelxistheilluminanceof1m²surfaceareauniformlylightedby1lmofluminousflux.Thefollowingdraw

7、ingexplainsthisdefinition.Onefoot-candleis10.76lux.1lm1lx1squaremeter6TND328/DRev.1–Sep07CorrelatedMonochromaticColorColorWaveLengthTemperature•Definesacolorasthetemperature[K]thata"blackbody"sourcemustreachinordertoproducethatsamecolor.NoonCIE(1931)xychromat

8、icitydiagramsunlightincludingthePlanckianlocus,withtemperaturesindicated.Wavelengthsofmonochromaticlightareshowninblue.ThelinescrossingthePlanckianlocusarelinesofconstantcorrelatedcolorte