NOTSOSCARYLIGHTINGMATHRSLightingDesignNOTO年代CRGHTYL我NGMTHRS照明设计

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1、LightingMathNOTSOSCARYLIGHTINGMATHNOTSOSCARYLIGHTINGMATHTheimportanceofLightingMath:•Calculationscandeterminethelightlevels•Calculationscandeterminetherequiredquantityoffixtures•CalculationscanverifylayoutMethodstoperformLightingMath:•ByHand•ByComput

2、er1LightingMathTargetIlluminance/LightLevelsWhoDefinesLightLevels?òIESofNorthAmerica–RecommendedPractices–DefineslightlevelsandqualityofilluminationbytaskandapplicationòCodesandRegulationsòTheOwnerDefinitions:Task=theworkperformedApplications=theproj

3、ecttype(i.e.School,Commercialetc,•IESNALightLevelrecommendationsareforFoot-candlesattheworkplane(2’6”AFF)•Theyhavelimitedsignificancetouswhenweinterprettheactualenvironment.•Suchfactorsaslightingwalls,brightnessaccents,shadows,sparkle,andcolorhaveagr

4、eaterinfluenceonemotionalreaction.•IESNA’srecommendlightlevelsareforanagerangeof40–55yearsold2LightingMathAgesStandardAgeRangeis40-55yearsoldLessthanOver5540yearsyearsold…old…CanCanreduceincreasethethelightlightlevelslevelsuptoupto2/3!1/3!Babiesrequi

5、re3timesmorelightthana20yearold!IESNARecommendedLightLevels3LightingMathSummaryLightLevel(table15)MeasuringLightLuminance•Measureshoweasysomethingistosee,orhowbightasurfaceis–emittinglightenergy•Examples:backlitsignage,afullmoon,glowingwall•Measuredi

6、n:Foot-Lamberts(US)orCandelaspermetersquared(metric)1Foot-Lambert=3.426Candelas/m2Illuminance•Measureshowmuchlightthereistoseeby,thelightleveltoperformatask–arrivinglightingenergy•Examples:emergencylightlevelonthefloor),•Measuredin:Foot-Candles(US)an

7、dLux(Metric)4LightingMathLight–TheFoot-candle1fc1footFoot-candleisknownasaunitoflight-directilluminationlightlevelDerivedfromonecandleplacedatadistanceofonefootfromasurfaceisdefinedasafoot-candle(abbreviation=fcorFC)Light–TheLumen1lmTheenergyoflightf

8、romacandlefallingonaonefootsquareareaisOneLumen(abbreviation=lm)Thetotalamountoflightenergycomingoutofthecandleisapproximately13lumensThetotalamountoflightenergycomingoutof100-wattA-lampisapproximately1650lumensNOTDEFINEDBYDISTANCE5LightingMathLight–