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<br />ing tt:.: ?roduct;v'-~ :,~d q'Ja~JlY of hu::-.2(;
<br />pe~o:rma;,ce. Too:iy's i!!u~i"allO;) Tr':-:::H~,-
<br />;;1e~da:ion$ J, the!}, are 't1i~ !"~S'-tit of 0e;;,07'.~
<br />S'l-It>" \'1""'~1 "'""e." ;T'~r<-~""~-' ~-,,-'''o'1\.,,-.,
<br />i. c:. _~ _~~. ,...t.. ~A_ t".~ ..~_.......i"..""-~"~.!
<br />or in.staI1atior., .lnd I.';~ ~ _.;au....e uecreas~ ~n
<br />th<< ~ per fc.otcar.dle.
<br />
<br />II n'J\.lst b<! c:!mphl>s~zt':\i that these are r~c~::-,'
<br />tn enOaIi OIlS , They are rbe resul~ of co::ser-,-~
<br />t:ve cC:1'1prQmises be1"\l'f-c:'D If.e ~"<)-.\.',, b"'!1~._:S
<br />o! h,gher 1il~mination anj t~e pnc:tk" l~"f,-
<br />sidenl!i0l15 '"":1; tech,~tcal i~(15tH;.lit) 2~C :';;Jst
<br />which face the modern ligh!i!1~ c!~sig!'_~r. T":t!
<br />conrinu!!!.g co:>slc::raticns o:f need, prGc:ical-
<br />ity and cost are1 hOll.'eve:-. th~ b"s:s ,':;f
<br />tomorrO',1r"S recommendations, wh;:-1:1 rr:;,y
<br />I;orne cl;:,se r atill U~ presc rtbi:1C': the le'..els
<br />needed to attain the maximum rr. \'i;;,".ol
<br />perlD:mance,
<br />
<br />NEED, as a!re3\.!V discussea, is bGs~(1 on
<br />tne evidence ?Toc:.;...ed t.y gl'eat!y inc.eased
<br />research eftorts. Much remai!l-S to be dane,
<br />tut we kno.... a great deal mor\!: to cay ab,)..,
<br />m(: relanc "ShIP :,et...een light end s ight U-.~;j
<br />formerly, ODe of the more imponaii! H:-
<br />suts of lighti:lg re5ear~h is tr..3t th~ r:;jl1:::-:U:1
<br />lighting levels r~qU1:rc.-d for e~Lcient visua!
<br />perf()rr:;i~ce 2.re now more clearlv deiloe:d
<br />mo.n ~ver !>~[c,re. .
<br />
<br />PR:\cnc...ElLIIT is simply a common
<br />se:'lse ~c0n;)mic .and ellgjr.eeri;:tg posture. As
<br />lamps and Ilghtmg !~t~re:; ~c.)m~ more d.
<br />1icieI'l! .!io.:! e!E'cai.::iry. relative Ii) G,ner
<br />production co~rs bec'Jmes che~per -' we
<br />lI..i1! realizE ihe pcssiLH:lties 0f the cor.tro1!e.;
<br />iatrOr.!ltD~' Sl!'-1.Hio" UI the indt.<;trial ar.-;i
<br />cornH:-e 1'C1a: \\.or!(1. C;odaY'5 1 ~ \...,! st.urc~s
<br />and ligh:mg equIpment ~n:, ~ dWctJssed n,
<br />L~-ssQns l' !~.1 cc ..t~ ;- :-;'';7, ,...~~f'e.~r~':.e~\". }
<br />Gei1er~Uy. n0 ~lne ""';:,-t$ to pn~Y~r'1t :;.ur
<br />visuai abjlity from att.<ming ~t:; maJo.lmum
<br />performilfice. {. is or.:y /':. quesHon of .....-te:-,
<br />the gap herween "some" !!ght i!!J6 ad.:y.J.:tt.:
<br />Ugh! \:3n no lor:g{'r be toler~t~c by tOd3Y'S
<br />econom Ie oemanc!:i_
<br />
<br />~T ct o'>\mni; and Op~Btl!1~ & hght1l1g
<br />. )su! i.(j(.~ t" n;,.t m-a.;:y ~ rna.lOr ,::on" ukr;j .
<br />tJ:,m. But 3$ the n~ed for adt'q~,He ; tght in~
<br />~eve~.s ~~CO:1)~S 1110I< ..:1f'ar~y cemcnSlrat~(:,
<br />anc s.s thp. ?uctlcab\!uy of efflC!entiv 0<:;-
<br />IWt'nng these higher leveis 10 ;;:I1Y hghtu'.,"
<br />tnsta Hat/on t>~(ome" moJ'~ .. fl:'21 ::y I the
<br />cost C()11S1d<:'t.alJO!1 '_101;1 ~ S~"!1 i:- ;; Nite~
<br />peH;rectl...~,
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<br />~...-, ~!"e~.:. L_ :..:~.a:ny I;cse~~ e..)q:~!ie::cl: has
<br />s!;c.,,'!: tr.a.f CU-2 to lncre3sec saJe:o A:1d
<br />;-,:,,:x:h.:2rivjry ~ ligt~~ng CO~-rS, H'.. COrr:?3-!"~~0\-;
<br />.J.;clU: ITii3chir:E:!) and plane L"'lvest.:!1€:1!, I"..a....~
<br />:-c:C0me <: I'['}:;:O::- CQnsid~r3tJQn,
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<br />:; ::1,;e the es r1y 1 ~OO's: the CIe.::r.:a$~ ,7', ceo,:
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<br />:-1[. :: -! ", ~1ii1imlJm Recommence-oj
<br />Inurr.lnatlOn L~Vtds for Vanuw$
<br />T&sl." anC U>C~tl0;,!!>.
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