CRSLTD Technical Seminar 1...Scotopicluminous efficiency function V'(λ) 1. The standard...

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Seminar 1:Seminar 1:Seminar 1:Seminar 1:

Measuring light and managing colourMeasuring light and managing colourMeasuring light and managing colourMeasuring light and managing colour

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ScotopicScotopicScotopicScotopic luminous efficiency function V'(luminous efficiency function V'(luminous efficiency function V'(luminous efficiency function V'(λλλλ))))

1

The standard V'(λ) function was adopted by the CIE in 1951 (CIE, 1951) and it is based on measurements by Wald (1945) and Crawford (1949). 

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CIE CIE CIE CIE "physiologically"physiologically"physiologically"physiologically----relevant" luminous efficiency relevant" luminous efficiency relevant" luminous efficiency relevant" luminous efficiency functionsfunctionsfunctionsfunctions

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CIE 1931 CIE 1931 CIE 1931 CIE 1931 TristimulusTristimulusTristimulusTristimulus valuesvaluesvaluesvalues

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ct

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400 450 500 550 600 650 700 7500

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l = L λ( )λ =390

λ =780

∑ C λ( )

m = M λ( )λ =390

λ =780

∑ C λ( )

s= S λ( )λ =390

λ =780

∑ C λ( )

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PF

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ReferencesReferencesReferencesReferences

NTnz.sin,t4gn, b*FFλxct7voedtqn.uy,nknsdt3.siIaa2pt5sdn,s.dvas.Tt7voedct

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7ntX ,.siptPctb*F;1xct2nwyesKfb:bgiKt(hKXnknb( b)sitnicxct7asias(t-e.:k.st.sit3.TTc

-5“tb)99;xct–ysi.knsd.Ttfe,ak.dvfvdgtiv.o,.ktlvdet:eguvaTaovf.Tt.znut 0.,dut*t.sit)ctrnfesvf.Tt4n:a,dt*λ9j*ctOvnss.(t-nsd,.Tt8y,n.ytamtdent-akkvuuvast5sdn,s.dvas.Tn intT!tXfT.v,.onc

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h gu6nf2vptX cptét_dvTnupth ct_ctb*F1)xct-aTa,t_fvnsfn(tfasfn:dut.sitkndeaiuptUy.sdvd.dvwnti.d.t.sitma,kyT.nctb)si nicxct/nltPa,2(th vTngc

h .TiptX ctb*FJ”xct3yk.stwvuvast.sitdentu:nfd,ykct’fnr(frpt*9*pt;”Pj;”1c

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_e.,:npt7ctrcpt_daf2k.sptNcpt].oT.pth ct.sit]\oTnpt3 ctb)99”xctNtTykvsayutnmmvfvnsfgtmysfdvasptGHb≡xptma,ti.gTvoedt.i.:d.dvasctubgi(t:Kb.KGnknb(sK”ptFJ1jF;1c

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XyvTipt]ctb*FP*xctrentfaTa,vknd,vft:,a:n,dvnutamtdentu:nfd,ykct@yn:bkb,ynft:Kdit(ktfenb(kKb.KeyrKoblt:K’bfnrelKb.K2b(hb(sKN)P9pt*JFj*1λc

qaTTaspt]ctLctb)99Pxct’,rfn.ln(wsKwr(riten(wsKt(hKTrtkgin(wKfb:bgikptvstOvuvast4nun.,fet[ Nt:,.fdvf.TtoyvintdatT.Ia,.da,gtkndeaiup *9;t[*)Fc

h nudT.sipt_cpt4v:.kasdvpt-cpt.sit-enysoptOctb)9*)xct-ak:yd.dvas.TtfaTa,tufvnsfntyuvsotqNr7N8tb)si nicxct]aesth vTng

4v:.kasdvt-cpth aath c7cpt-,alden, “ct.sit_daf2k.stNctb)99Fxptrent_jfasntfasd,vIydvastdatTykvs.sfntin:nsiutastdentqj .sit7jfasnt

.i.:d.dvastTnwnTu(tuvTnsdtuy,,aysiu]tubgi(t:Kb.KGnknb(sKFtbPxpt*9pt**j*;c

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