Holophane Expresslite Series Brochure 7-73

7/28/2019 Holophane Expresslite Series Brochure 7-73

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f" r)>iwE:.-+Abetterwayoflookingathighwaysignillumina1;9n.Q'r{Holophane 78O Expresslite'


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Fig.la lncidentillumination is not

More ef fective lightingfor highway signs.

As our high-speed highway systems becomemore and more complex, effective lighting of high-way signs becomes increasingly important forthe safety and performance of the motorist.Today's lighting slandard.Until now, the criteria for effective sign light-ing have been the level of illumination, measuredin footcandles, incident to the sign face, and theuniformity with which these footcandles aredistributed.

In essence. this is a measurement of what thesign "sees."In the case of diffuse painted signs, there istheoretically a direct and constant relationshipbetween incident illumination (footcandles) andluminance (footlamberts). But with a retro-reflecting signr+, this is not the case. A variablerelationship exists betvr'een the illuminationon the sign and the luminance observed by themotorist.Retroreflecting signs have reflectance charac-teristics that change with the angle of view andangle of light incidence. The percentage of re-flectance is far higher directly in front of theluminaire. This often results in a bright area,

causing non-unif orm observed luminance, tendingto obscure the legibility of the sign.This halo effect may occur despite the fact thatlhe incjdent ligh i meels a"cepted standards ofuniformity.Good luminaire design must take these vari-ables into account. For areas of the sign havinghigh reflectance, a proportionate reduction incandlepower is required. While areas oflowreflectance must receive greater candlepower inorder to create the luminance uniformityrequ irad for an eflecl i\ ely Iighl ed sign.

'A r.rro ellectir s riqr is ore rlal r!o porares a maie ial wricr hasrr e propedy of rerlpclrno I art i- t-e d|ellron ot the source.

Fig.lb Reflected light(luminance) is whalthe motorist sees.

Fig.2a Light strikingperlectly diifuse signis reflecled equally inall directions. Thus,io a viewer at p oint Aor point B, apparentluminance would beequal.

Fig.2b Light strikinglhe surface of a relro-reflecting sign isreflecled unequally.Thus, to a viewer atpo;ntA or point B,apparent Iumjnancewould be diflerent.

Fig. 3 Retlectancecharacteristics lor alypical reiroref leclingsign viewed kom 150'and 1200'. Note thatreflectance is highestdirectly in front ofthe Iuminaire. Withoutproper luminairephotomelric design,lhese characterislicsmay result in reducedsign legibilily.


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Luminance. A new standardlor lighting highway signs.From the explanation on the previous page,it is obvious that quantity and quality of incidentlight are not necessarily a suficiently accuratemeasure of sign visibility. The true measureis luminance over the face of the sign throughoutthe viewing range of the sign. This is what themotorist sees.Both the level and uniformity of sign luminancemust be controlled. Whether the luminance levelis too high, too low or simply non-uniform, the

result will be an illegible message. In addition,excessively high luminance will tend to causeproblems of eye adaptation. A motorist glancingat an overly bright sign as he travels a darkhighway will have momentary dimculty in seeingwhen he returns his attention to the roadway,A further criterion of effective sign lighting isthe luminance gradient produced upon the signface. Research has shown that cerlain maximumratios are acceptable when the maximum andminimum points are spaced apart by several feet.However, if the maximum and minimum pointsare in close proximily, lhen lhe luminancegradient between the two points will be greater.This may be unacceptable, because it createsan undesirable appearance and contributes toreduced legibility.

Application of the new slandard.Two principal external factors affect thevisibility and legibility of a highway sign: theambient illumination level in the seneralvicinity of the sign and the disabling and/ordiscomfort glare from oncoming headlights.There are two application extremes: a dark,open rural road and a brightly lighted dowatownstreet. All other applications fall somewhere inbetween.Glare from oncoming headlights greatlyaffecls I he lFg ibility of low luminance signs inrural low ambient conditions, but has muchless effect on the legibility of signs under down-tom high ambient conditions. In downtownareas, the disabling effect of headlight glare isreduced as a result of lower contrast betweenthe headlights and the surrounding brightness.

Recommended Luminance for Highway Signs*Thc lu m inance of a highway sign is acomposite measure of the light reflected from thesign legend (lettering) and the sign back-ground. Interstate highway signs use variousbackground colors depending upon sign function,but they always use a white legend. Therefore,the luminance of the white letter, or LegendLuminance, is used as the basis of the luminancedesien criteria.

'Holophane recommendalions based upon resulls ol a sludy byMichigan stale Universily and the Michigan Department oi SlateHighways reporied in Highway Fesearch Becord No. 179, 1967;and upon subsequent investlgalion and analysis by Holophane,"'The averaqe .ellectance ol the legend measured at any poinl on lhgsudace ol the sign.

Nole: The luminance required for optimum legibility is a iunclionoi lhe ambient illuminalion level and other exle.nal laclors Joundal a speciiic sign localion. Under most circumslances, excsllentlegibilily will be provided at lhe lower limil ol l!minance providinglhe uniiormity and gradienl do noi exceed those specilied.tDislribulion ol luminance should be as Lniiorm as possible loroplimum leqibility. The ralios recommended rellct values gen-erally obtalnable wlth reasonable lLminaire application and desTgn,Nole: Cla. lamps ar rcommended lor optimum unilormiiy andhishest efiici6ncy. Coaled lamps may be used when color renditionis a prim applicalion faclor.

llMaximum gradient is lhe maximum prmissible varialion inluminanc between any one-square{oot area ot the sign lac6 andlhe one,squareJool areas adiacent to il.


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Compare 78O Expresslitewith conventional sign luminaires

780 Expresslite is elleclive.The comparison phoiographs clearly demon-strate that 780 ExrErSsl,rrn not only providesmore uniform luminance, but also provides fargreater luminance efficiency.In the case of the conventional mercury vaporluminaire, and again with the flr.torescent unit,two luminaires are required to light the 10' x 10'sign. lvhile a single, low wattage, 780EXPRESSLITE provides more uniforfir coveragethan either of the other two systems.Itshould be noted that a simple comparison ofaverage luminance values is not in itself anaccurate measure of system performance. Thispoint is graphically illustrated in the comparisonphotograph below. On the fluorescentJightedsign (far right), the excessively bright area nearthe bottom contributes to a high averageluminance value but it tends to make the sign'smessage less legible.

780 Expresslite is economical.The wide spacing feature of 780 ExpRESsLrrE -units are designed to be mounted on 10' centers -coupled with the highly efficient, prismatic light

control and the ability of these units to use lampsul to 400 walls, mea ns fe\ver luminaires areneeded to light most signs. This translatesdirecily into important savings on installation,maintenance and operating costs.780 Expresslite is glare-lree. Front or back.

From whichever direction a motorist approachesa sign illuminated by 780 ExpRESsLrTE, he isprotected from luminaire glare. An integralshielding action eliminates objectionable glarefrom the front, while the luminaire housingprovides direct light cut-o1T to the rear. A separatefield-attached front shield is provided with eachluminaire for use s'hen total frontal cut-off isrequired.780 Expresslite has a low prolile.

With optional back-mounted ballast assembly,780 ExpRESSLITE provides a clean. clutter-freeappealance. The shallow proflle and lack ofmassive luminaile support structure not onlyimprove sign appearance and readability, butalso help to lower the cost of the sigl.


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D

Laboralory measuremcnts were used to deve op lhoperformance data tabulated be ow for d fluse and rtrorer eclinq s qns. A I va les shown are for lesend lum nancemeas!red at the cenlers ol the one-squareJoot areas andare expressed n ioot amberts (Ft ). Periormance va !es vv lhc ear amps arc showr on lhe leit hard side ol each'siqn." Values Jor coa1e.1 lamps are showf on thc r sht handside. Performance !v th e ther lamp is considered sym'net. calabout tlre c-onler ne oirhesgn.Thefol owing materialsand mouni ng pararncters \dcr-o us-ad

LampsClear - I 75W H39-22K8. 7100 L!nrefsCoaled 1;5W. H39-22KC,/DX 7750 LumensLegend malerialD ffLrse - Wh;tc.namc p.11n1.0.74 r.ilecta,rceF-!lrorei ect ng - Scot.h tc:3870 Wh i!Fixlure mounlingI !ht Ccntcr - l'bc ovr' end.1 r front of si.rr iace10' WicJe S !n - Onc 780 EXPUESSL TE lLr m in alrc :rt ce nte r of si!rn20 Vr' dc Sjgn - Two 780 EXPFESSL rE lum na res on 10' centers

F. 10'Clcar Mcrcury Coated Merc!ry10' 16 19 22 27 33 10t0 g S 79'15 19 20 20 19 11 11 10 10 I8', 12 16 21 22 23 14 13 13 t2 107' 1s 1a 23 25 27 1S 18 17 16 136', 20 21 26 27 2A 22 22 21 19 16s', 22 24 25 24 24 27 27 27 23 174', 25 25 22 22 23 33 33 33 26 193', 1S 21 21 24 24 41 39 37 28 192', 19 21 23 28 27 40 39 35 26 181', 16 18 18 16 16 30 27 21 16 13s',1',3'2',t',12',3',4 5',22 A\s Lumi.ance (Fll) 212.75l1 l,4ax lMin Llnljormity 5.86/11.52l1 [4axi.r]um Gradient 2.18 / 1

10' 16 18 18 16 16 19 21 24g', 15 19 20 20 19 23 24 26812 16 21 22 23 27 27 27713 18 23 25 27 30 30 296 20 21 26 27 2a 31 31 325', 22 24 25 24 24 27 2A 311', 25 25 22 22 23 25 25 2731921 24 24 24 26 27 282 t9 21 23 2A 27 303t 27116 19 22 27 33 34 30 2410 9 8 7 6', 5', 4 3

14 15 13 13 13 10 10 9 9 716 17 16 16 15 11 11 10 10 I19 13 18 18 18 14 13 13 12 1023 23 23 22 22 19 18 17 16 1327 27 27 27 26 22 22 21 19 1630 31 33 32 30 27 27 27 23 1731 34 38 37 36 33 33 33 26 1930 35 41 43 44 41 39 37 2A 1929 33 39 42 42 40 39 35 26 182A 2A 24 30 32 30 27 21 t6 131 2 3', 1 5 6 7 8', g', ]C

27 2927 2724 2326 2432 3536 4134 4327 2827 3022 22

25 Av! Lrm nanc. {Ft I 243.58/1 M!r./M n Uf lormily 6.28l11.6211 [1ar n]!m Gra.l ent ?.18/1

10' >lClear Mercury Coated Mercury10'16 17 17 16 1s 10 I I I Ig',13 17 18 19 18 11 11 t0 10 I8' 11 15 18 23 20 13 14 11 1'1 107', 11 14 18 21 25 17 15 14 13 10

6', 16 17 19 20 22 18 17 16 15 125', 17 t8 18 18 16 20 22 20 17 134' 19 19 15 17 't7 24 25 24 19 143', 13 16 19 23 21 34 35 2A 21 13213 14 18 17 18 36 30 27 t7 121'14 11 10 12 17 33 21 16 11 I5',13'2',1',1z',3',4517 Avg. Luminance (Fl ) 172-2711 Ma\.tMtn. Un form ty 4.5/11.8/1 M.x mLrm Gr.d eni 2 4sl1

10' 16 17 17 16 159 13 17 18 19 188', 11 15 18 23 201', 11 14 18 21 256' 16 17 19 20 22s' 17 18 18 18 16.1', 19 19 15 17 173', 13 16 19 23 212', 13 14 la l7 1A1', 14 11 10 12 17tn 9' n 7' 6'

la 20 22 2521 23 23 2523 27 23 2228 25 23 2l25 24 25 251A 21 23 2719 20 19 2623 26 22 2220 19 21 1919 14 12 145',132',

Conled Mercury28 15 13 13 13 1324 16 15 15 15 1421 18 17 15 18 1621 19 20 19 19 2026 20 22 21 21 2131 22 24 25 26 2331 23 25 29 29 2720 21 27 32 38 3621 19 22 3',1 33 3g19 14 14 19 23 351 1', 2 3 1 5

10 9 I 8 I11 1'1 10 10 I13 14 11 11 1017 15 14 13 1018 17 16 15 1220 22 20 17 1324 25 24 t9 1434 35 28 21 1336 30 27 17 1233 21 16 11 96 7 8 g', 10',

20

20 Alo Llm n.n.. lFl ) 1c3.1/1 Max /Min tlnii.rm 1v 4 5/11-A/1 Mnx mun Grad enl 2.45/1


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Sign illumination. in tootcandles (any sign).Average inilial illuminalion (tc) lor variors syslemsSize Number ol Spacingg! Lunrinaires -I----EsrgnHxW

100W Mercury 175W MercuryH38-47Clear 4JA/DXCoaled

250W Mercury 400wM400ClearM.H.H38- H-39-22K8 H39- H37-5KA H37- H33-1CD H33-22KC / DX CleatCoaied 5KC/DX ClearCoated 1GL/ DXCoaied6'x8' 1 4', 16 18 33 39 52 59 87 84 1306'xl0' 1 5' 15 17 32 36 50 54 83 76 1268'x12' 2 6' 3' 23 24 49 51 76 77 127 110 2O1a'x14' 2 a' 3' 20 21 42 44 66 67 110 95 174'10'x16' 2 a 4 18 18 39 37 60 57 101 81 159

1O'x2O' 2 10' 5' 15 15 34 32 51 49 87 68 137't2'x22' 3 8' 3' 18 18 40 37 61 57 103 80 164't2'x24' 3 a' 4' 17 17 39 36 59 55 100 77 15912'x26' 3 S' 4' 16 16 36 33 54 51 92 71 14712'x2A' 3 9' 5' 16 15 35 32 53 49 90 69 14312'r3O' 3 10' 5' 14 14 33 30 43 46 84 64 133

Legend luminance, in tootlamberts (retrorelieciing sign - 1200'viewing distance).*SizeSignHxw

Averag6 inilial legend luminance (lll.) tor various syslemsNumber of Spacing 100W Mercury 175W Mercury 250W Mercury 400W Mercury 400W M.H.Luriraires l----f, ffi-4T H38- H-3g-22Kg hag- 'r37r(B H3a H33-.cD ll33- Mr00Clear 4JA/DX 22KC / DX CIeat 5KC/DX Clear l GL/DX ClearCoated6'x8' 1 4',A 10 17 23 2A 33 47 527D6'x10' 1 s',8 913 21 2A 30 45 46688'x12' 2 6' 3' 12 14 27 30 45 45 72 68 1168'\14' 2 A' 3' 11 12 24 26 39 39 62 59 10110'x15' 2 A' 4' 10 11 23 23 36 34 59 50 951O'x2O' 2 to' s' I I 20 1g 31 29 51 42 A2'12'x22' 3 8' 3' 11 11 24 23 38 34 61 51 101'12'\24' 3 a' 4' 10 10 23 22 37 33 59 49 9812'x26' 3 9' 4' 10 10 21 20 34 31 55 45 9012'x.2A' 3 9' 5' 9 S 21 2D 33 29 53 43 8812'x3O' 3 10' 5' S I 20 18 31 28 50 40 A2

For legend lunr nancc of a.liffuse sl9n. multlplyiootcandle valucs shov/n I lab c at top by a reilecianceNole 1: Al valuesbasedon !htc.rnt.r1'b.lowan.l 4'nNote 2:ThLS d.ta s pro! ded on y as a gu de io lilihtingdes sr Average values ot I !minailon (lc) or l!m nance (ill)are not in th-6mselves a measurc of s gn liqhling eifect ve'ness Contact yolr local Holophane sales enqlre-.r ior prec seperlormanc-o data cover ng your app lcal on


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Optical /mechanical /electrical data.

Oplical system.The oplical system consists of a hydroformd aluminum prlmary beamrellector, precisely proJiled and contoured to distribute light across theinnr surface oi the refractor. The prismalic relractor is molded ofborosilicate ENDURAL@ thermal shock-res stant glass. An intricate arrayof prisrns on the inner surface dlrects light across lhe face of lhesign. The ouler surface is smoolh 1o facilitale sell-cleaning.When 780 ExPRESSL TE is used with relrorellecting signs, an auxiliaryrelrodispersing reflector is used lo eliminate the halo ol excessiveluminance produced by convenlionals gn lighls- This device assuresmore unilorm sign luminance.Relracror (1)Mechanical assembly - main housing.The main housing (2) is a slurdy aluminum casling which enclosesthe primary beam reilctor, retrodispersing refleclor (it used), sockeiassembly, and termlnal block.The sliptitler (3) provides a vertical adjustment range of 10'to permitcompensation lor mount ng misalignment. This lealure is also used loadjust light dislribution when 780 EXPRESSL TE is applied to s gnsgreater than 12' high. The sllpfitter is designed lor use wilh 1ya " pipe.The rerminal block is located benath the refTeclor at the pipe entry.Terminals will accomrnodale wire sizes AWG 14 through 6.The refleclor is lastened to the housing by means of four screws.Keyhole slots are provided in lhe retlector to faclliiate easy removalLeveling pads {4) are provided on lhe inside and boltom of lhe mainhousinq lo permit accurate installation.Mounling bosses (5)are provided on the botlom ol the cast housing topermii mounling lhe lum naire directly to a supporling struclure.Mechanical assembly - relractor/door.An extruded. anodized aluminum door frame is lormJitled lo therefraclor. A single piece gasket, wilh a specia ly designed sealing pad,elfeclively seals lhe assernbly and houslng. The assembly fasiens1o lhe hous ng by means of separable hinges al the Jront, and spring-lempered, slainless steel laiches at lhe rear.Relraclor (1)Anodized aluminum door lrame (6)sprins-loadd separable hinqes (7)Stainless steel lalches (8)

6Table ol electrical characteristics-Lamp 400 Wall Metal HarideAallasl type

nal primary vollase 2AA 210 277 480 120 204 244 277 480 12D 208 244 277 2OA 240Slarlinq line current 2A tl 10 9 5 24 1.4 12 19 3 3.0 1.5 1.6 1.0Operaling line currenl 2.6 1.5 1.3 11 7 3.8 2.3 19 1T 96 1.8 1.0

72 125 167 288 72 125 167 2Bn 65 15 150 260 55 95 110 225laqe 4A 45 45 45 50 65 65 70 70207 290 445 445 445 465 4TQ 474

245 250 2!090% 989i 90?'.Lamp wallage regulalion(al 1100/6 vollase)Ambient slarlinq lemperature 20'lrConslanl Wallaoe Aulorranslormer ?Conslani Waltage rModLledCo.sranrWarlaqe rPeak Lead AurolransformerCAUT ONrUngroLrnded power dislribut on syslems may carry h gh trans enl line vo tages Lnder fau t condilions.Because h gh transients can cause prenalure ba ast lail!re, possib e wilh bal asis of any manuiactureis design,t is not recommended ihat luminalres be operald on 480v ungrounded systems.


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Holophane Expresslite Series Brochure 7-73

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