Sylvania Engineering Bulletin - Tungsten Halogen Lamps 1988

7/28/2019 Sylvania Engineering Bulletin - Tungsten Halogen Lamps 1988

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HAIoGEN rAmPs


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TABTE OF CONTENTS

Theory of OperationThe Halogen Cycle

Illumination CharacteristicsSpectral Energy DistributionColor Temperature

Physical CharacteristicsFilament Design .Bulb Shapes

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Types of BasesM.O.L. and L.C.L.

Basic Types of Tungsten Halogen LampsDouble-EndedCompact Double EndedSuper Q Single-Ended ..I n]\.\z

Operatin g CharacteristicsLamp LifeEffects of Line Voltage VariationDimmingMaximum Seal Temperature .....

Sockets for Tungsten Halogen Lamps .Applications

Buildinq Exterior FioodlightingUsed Car Lots and Parking LotsSports LightingPhotographic LightingStudio, Theater and Television LightingReprographic ServicesSpecial Applications

Operating InstructionsCaution Notice


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TUNGSTEN HATOGEN TAMPSTHEORY OF OPERATION

The Tungsten Halogen lamp is basically an incan-descent lamp, as far as the type of light is concerned,but it has several characteristics that make it superiorto conventional filament lamps. Both ordinary incandescent lamps and Tungsten Halogen lamps consist of three basic parts. These are (1) a tungsten wirefilament on a suitable mount; (2) a sealed bulb,usually quartz, containing an inert gas or a vacuumto protect the filament from oxidation; and (5) someform of base to serve as mechanical support andprovide electrical connection. When the lamp is con-nected to an electrica] circuit, the electric currentpassing through the filament wire must overcome itsresistance, and the power consumed heats the fila'ment to incandescence (causes it to glow).In many respects the Tungsten Halogen lamp issimilar to the conventional incandescent lamp, andsome of the common operating characteristics arecommon to both types. Since the two are similar inmany respects, and because conventional incandescent lamps will continue to be used for a long time, itis suggested that the basic characteristics of conven-tional lamps be reviewed in Engineering Bulletin0-324 on incandescent lamps. Later in this bulletinthe differences between incandescent and TungstenHalogen Iamps will be pointed out.One of the major advantages of Tungsten Halogenlamps is the maintenance of initial light outputthroughout life- They do not blacken, and the bulbremains clean until burnout because of the "halogencycle", which is expiained later. Another significantadvantage is the gain in life with the same Iightoutput. Tungsten Halogen lamps have twice the lifeof comparable wattage incandescent Iamps with thesame lumen output. They are also more compact, fora given power rating, than standard incandescentlamps.THE HALOGEN CYCLETungsten Halogen lamps were originaily calledIodine Quartz lamps because this seemed to bestdescribe the Iamp which contained iodine in a quartztube. Iodine is a member of the halogen elementfamily which also includes bromine, chlorine, fluor-ine and astative. Since bromine has replaced iodinein some lamps, it was decided to use the broaderfamily designation Tungsten (for the filament com-position) Halogen (for the element family used)rather than to identify each halogen which might beused. For this same reason the "iodine regenerativecycle" is now called the "halogen regenerative cy-cle. "The halogen regenerative cycle for iodine works as

lOD NE CYCLE.. ^- r700ecioioi",# "',-" - (6A5)

Figure 1. The halogen regenerative cycle lor iodine.Tungsten atoms combine with iodine vapor to formtungsten iodide which is carried back from the bulb wall tothe filament. The high temperature separates the originalelements, with tungsten returning to the filament andiodine set lree to repeat the cycle-shown in Figure l. Ordinarily, in a standard incan-descent lamp, tungsten particles evaporating from ahot filament are carried by convection currents tothe relatively cool bulb wall, where they accumulateand form a black deposit. However, under tempera-tures of several hundred degrees centigrade, tungstenatoms and iodine vapor combine with each other toform Tungsten Iodide. Because the bulb wail tem-perature must exceed 250'C to maintain effectiveoperation of the halogen cycle, a small diameterquartz tube is used. Since quartz has a melting pointof 1650'C, it meets the temperature requirements ofthe halogen cycle and will withstand the extremeheat from high wattage filaments.Operation at bulb wall temperatures of between250'C and 1200'C is readily achieved in smalj diameter tubular quartz lamps. When tungsten iodideis formed in the vicinity of the bulb wall, it will notadhere to the hot tube and is borne by convectioncurrents back to the filament where the temperatureexceeds 2500"C. The hiqh temperature reduces thetungsten iodide into tungsten which redeposits onthe filament and free iodine vapor which recirculatesto continue the regenerative cycie. This cycle keepsthe bulb wall clean and results in a much hiqherlumen maintenance than obtained with a conventional incandescent lamp as shown in Figure 2. Theoretically, the lamp life would be vastly longer if thetungsten could be redeposited evenly on the fila-ment. Actually, this does not happen, since the

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t---\ --- ----t---r-.--\ =-\ --=-_1l"s111.,1q*"1*",i!--..----Figure 2. Typical lumen maintenance curves


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redisposition is uneven, and the lamp reaches the endof design lfe when a thinner section develops in thefilament as it does in the conventional incandescentIamp.In some types of Tungsten Halogen lamps, particu-Iarly for photographic and reprographic applica-tions, bromine is used instead of iodine. One of theadvantages of bromine is that it lowers the minimumbulb wall temperature necessary for the operation ofthe halogen cycle from 250'C to 200'C. This meansSPECTRAL ENERGY DISTRIBUTIONThe spectral energy distribution of Tungsten Halo-gen lamps is similar to that of standard incandescentlamps, with only a small percentage (10-I2%) ofthetotal energy in the visible region. Approximately70% of the energy is infra red, nearly 19% conductedand convected heat and 0.2% ultraviolet. Becausethere is a slight absorption in the green band, byiodine vapor, Tungsten Halogen lamps have a veryslight purplish tinge. However, this color differenceis not noticeable except in the most critical side-by-side viewing. This purplish tint is occasionally no-ticed for a few seconds right after the lamp has beenturned on and is frequently observed while theiodine is condensing in the lamp after it is turned off.Tungsten Halogen lamps made with bromine insteadofiodine produce a "whiter" light, with no tendencytoward purple.

that the bromine lamp reaches operating tempera-ture sooner and is able to begin its halogen cyclemore quickly than an iodine lamp. Since bromine is arelatively colorless gas, another advantage is a gain offrom 3 to 5% additional output when compared toan iodine lamp of the same wattage. It is expectedthat the use of bromine will be expanded in certainreprographic and short life photographic Iamps andiodine will continue to be used in most standardtypes.

below the freezing point of water. One way of meas-uring it in the laboratory is to compare the color of atest light source against that of a standard calibratedIamp.Color temperatures of Tungsten Halogen lampsrange from 2800"K to 3400'K, the choice often de-pending upon the application. Standard long lifeTungsten Halogen lamps average approximately3000'K. Lamps designed for studio, theater and tele-vision lighting usually run 3100"K or 3200'K. Thereis a slight drop in color temperature during the life ofthe lamp, the amount depending on the individuallamp and the time. Limited measurements indicatethat the average drop is about 50"K from beginningto end of life.

450 500 550 600WAVELEX6TH II{ NANOMETEFSTypical color temperature variations with voltagefor Tungsten Halogen lamps,

Figure 5. Relationship of color temperature and lampefficacy for Tungsten Halogen lamps.

IITUMINATION CHARACTERISTICS

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LET LUE I GREEN I YEL.IORANGI AED

"-"2,#26ez .aWAVELEN6TX IN NANOMETERSFigure 3. Spectral energy distribution curves for Tungsten

Halogen lamps at various color temperatures.Figure 3 depicts the spectral energy distribution ofTungsten Halogen lamps of 2800'K, 3000'K,32OO'K and 3400'K color temperature. It will beseen that the curves shift toward the blue spectralband as the color temperature rises.COLOR TEMPERATUREColor temperature may be simply defined as thedegrees of whiteness of a light source. It is measuredin degrees Kelvin (K), an absolute centigrade temper-ature scale on which zero corresponds to 273 degrees4


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Variations in the voltage applied to a Tungsten Halo-gen lamp will raise or decrease the color temperatureat the rate of approximately 8 to loK per volt ofchange for I20 volt lamps. Figure 4 shows how colortemperature varies with over voitage and under volt-age operation.Since the lamp efficacy, i.e. lumens per watt, de-

pends almost entirely on filament temperature,there is a definite relationship between lumens perwatt and color temperature. This can be useful inestimating the color temperature of a particularTungsten Halogen lamp, if the nominal color tem,perature rating is not available. This is illustrated inFigure 5.

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Figure 6. Filament forms most commonly used inTungsten Halogen lamps.BULB SHAPESAlthough standard incandescent lamps are made inmore than a dozen bulb shapes, Tungsten Halogenlamps are generally available only in tubular andPAR bulbs. Several types are pictured in Figure 7.Bulb shapes are identified by a letter or letters des-cribing the basic shape and a number designating thebulb's maximum diameter in eighths of an inch.Thus, a T-4 bulb is tubular in form with a maximumdiameter of 4/8 inches or % inch.TYPES OF BASESTungsten Halogen lamps are available with a widevariety of base types, some of which are depicted inFigure 8. Most of these are also used on conventionalincandescent lamps, but a few, such as the RSC (re-cessed single contact), are peculiar to Tungsten Halo-gen and Quartz Infrared. The abbreviations Listed arestandard for the industry.

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&? PA6C

PHYSICAT CHARACTERISTICSFILAMENT DESIGNFilaments for Tungsten Halogen lamps are made inseveral forms for different uses as shown in Figure 6.As with conventional incandescent lamps, the fila-ment forms are identified by a two part designation.The first part indicates that the wire is coiied (c) orcoiled-coil (cc). The second part is an a-rbitrary num-ber to identify the filament form. Thus, a CC-8 fila-ment is a coiled-coil wire of Form 8.

i-lE;I:J_l? Figure 7. Common Tungsten Halogen bulb shapes.M.O.L. AND L.C.L.The maximum overall length (M.O.L.) of a single-ended lamp is measured from the top of the bulb tothe bottom of the base. With double-ended lampsthe M.O.L. is measured from the outer edge of onebase to the outer edge of the other. The light centerIength for single-ended lamps is measured from thecenter of the filament to the bottom of the base forscrew bases, to the top of the base pins for bayonetbases, to the top of the fins for prefocus bases, to theshoulder of posts for mogul bipost bases and to thebottom of bulb (base end) for medium bipost bases.Some bases have special reference points, as shownin Figure 8.u*" U*^ uBleMs Mc uL doYw:_:7ffi-wzffiU [I H..Y,Ww ffi"ui'*"m-" -F


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BASIC TYPES OF TUNGSTEN HATOGEN TAMPSDOUBLE-ENDEDThe first Tungsten Halogen lamps were the double-ended 500 watt and I500 watt (introduced in 1959),both in the T-3 size. These types are still widely usedfor general lighting applications, and the line nowincludes several other sizes. All have the basic con-struction pictured in Figure 9, with a C-8 filamentand aT2lz or T3 bulb. The lamps should be burnedwithin 4 of the horizontal to prevent bulb blacken-ing.

Figure 9. Typical double-ended Tungsten Halogen lamp.COMPACT DOUBLE.ENDEDThe compact double-ended line now includes sizesfor I20 volt operation ranging from 300 watts to1000 watts. They have a T4 or T6 bulb and a CC-8fiJ.ament, as shown in Figure I0. Their shorter lengthand larger bulb diameter permits them to be burnedin any position without blackening. Because of theirsmal1 size and short filament they provide accurateoptical control for general lighting.

TZ TUBEC BASE

-8 TUNGSTEN FlLAMENT

FtLLEo W tTH 99.8 0/..2'tANOIOOINEI'I SUPPORTWIRE

FILLED WITH 99.8% ARG RSC EASE206 NITROGEN ANO TRACEOF IOOIN E VAPO RFigure 10. Typical compact double-ended TungstenHalogen lamps.

SUPER-O SINGLE-ENDEDThe unique single-ended construction of this lineand compact CC-8 filament provide more efficientlight distribution than any other Tungsten Halogenlamp. The line has been expanded from the original250 watt lamp to include sizes for 120 volt operationfrom 150 watts to I500 watts. The basic construc-tion of this type is shown in Figure 11. They permitthe use of properly engineered compact fixtures be-cause of their small size and can be burned in anyposition. Appiications include spot, flood and gener-al lighting.6

MOLYBDENUIiIFOIL AT SEALMINI-CAN SCREW BASE

Figure 11. Typical Super-O single-ended Tungsten Halogenlamp.PAR-OTungsten Halogen PAR-Q lamps have the advantagesof standard PAR lamps (reflectors that stay cleanand various beam spreads) combined with the advan-tages of Tungsten Halogen lamps (longer Life, higherfilament efficacy and excellent lumen maintenance).These are accomplished by sealing a compact Tung-sten Halogen lamp inside a PAR bulb filled with aninert gas, as shown in Figure 12. PAR-Q lamps areavailable in two sizes, the 500 watt PAR-56 and1000 watt PAR 64. There are four beam spreads,narrow spot, medium flood, wide flood and verywide flood. They are recommended for indoor andoutdoor spotlighting, floodliqhting and generalliqhtinq.

TU BE

BULB

PRONG BASEFigure 12. Typical PAR-O Tungsten Halogen lamps.

F ILLED WITH 99.4% ARGON,2% NITROGEN AND TRACEOF IODINE VAPOR

TUNGSTENFILAMENT QUARTZ,_--_ - ^^ ^ ^-^=:--\,t/l:i::'-'^:-1-:::.:..' -


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OPERATING CHARACTER,ISTICSLAMP LIFELike conventional incandescent lamps, TungstenHalogen lamps can be designed for almost any de-sired life. However, lamp lile depends on just howfast the tungsten evaporates from the filament and,therefore, the rated life of a lamp is determined bythe filament temperature. The life decreases as thefilament temperature increases and increases as thefilament temperature decreases. This means that lifeand light output of Tungsten Halogen lamps are tiedclosely together and cannot be varied independ-ently. For a given wattage, the rated lumens andcolor temperature increase as the life decreases andvice-versa,Because of slight variations in lamp making opera-tions and component parts, it is impossible to haveeach individual lamp operate for exactly the life forwhich it was designed. For this reason lamp life israted as the average life of a large group of lampstested under laboratory conditions.Normally, some lamps will fall short of their ratedlife, even when operated under ideal conditions, andothers may last half again longer than their rated life.At the end of rated life, approximately 50% of theTungsten Halogen lamps in a large group will haveburned out and 50% will remain burning as picturedby the curve for good quality lamps in Fiqure 13.

Figure 13. Life expectancy curve for Tungsten Halogenlamps.EFFECTS OF LINE VOLTAGE VARIATIONBoth Tungsten Halogen and conventional incandes-cent lamps show approximately the same changes inthe basic characteristics of lumen output, wattage,lumens per watt, color temperature, life, etc., whenthe voltage is varied except that the performance ofTungsten Halogen J.amps cannot be predicted accur-ately over as large a voltage range. Figures 14 and 15show how variations above or below normal voltageaffect the characteristics of a lamp. It will be notedthat lumens and life are altered greatly by only asmall change in voltage while watts are not affectedto as Eeat an extent. An increase in voltage forces

more current through the filament wire, increasingits temperature and thus causing it to glow brighterand produce more lumens. At the same time, thewattage is increased because the component voltsand amperes are greater, and the resistance of thefilament is increased because its operating tempera-ture is higher. Life of the lamp is shortened due tothe more rapid evaporation of the tungsten wire asits temperature rises. Conversely, a decrease in volt-age affects all the characteristics in an opposite man-ner-

o to 20 30 40 sO 60 70 AO 90 rOO rO 12(% RATEO VOITAGE

Figure 14. Typical wattage and lumen variations with voltsfor Tungsten Halogen lamps.

Figure 15. rroi""r rir" ""tri"ai""'ivnT "r,tr r"r r""nra""Halogen lamps,It should be kept in mind that these curves showaverage data for all lamps, and individual lamps maybe expected to deviate slightly from the average. Atvoltage changes greater than 110% the deviations are

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=30 roo 20 r40PERCfNT OF NATEO AVERAGE L FE


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Figure 17. 150 watt Tungsten Halogen dichroic reflectorlamp for slide and movie projectors.short life and high color temperature from 3100"Kto 3400'K. The Iamps are designated by a three lettercode assigned by the United States of AmericaStandards Institute (USASI). The letters are arbi-trarily chosen and do not describe the lamp, but thesame code is used by all manufacturers for a specificlamp.STUDIO, THEATER ANDTELEVISION LIGHTINGSome of the most effective uses of the unique prop-erties of Tungsten Hal.ogen lamps are found in light-ing applications for studio, theater and television.Not only have many new types of lamps been devel-oped, but many new luminaires have been made touse them. Because of the need for high levels of illu-mination in these industries, particularly color tele-vision, the use of relatively high efficiency, short lifelamps can be justified economically. Among thenewer light sources are Tungsten Halogen iamps thatare designed to be directly interchangeable withstandard incandescent lamps and serve as replace-ments for these types in studio, theater and tele-vision lighting equipment. These include the 2000,5000, and 10000 watt, bipost base lamps, with colortemperatures of 3200'K or 3350"K. The 5000 wattsize is pictured in Figure 18.REPROGRAPHIC SERVICESExtensive use is made of Tungsten Halogen lamps bythe reprographic industry, particularly in photocopymachines of the direct electrostatic type. Their basicadvantages of fast warm-up Lime without an externalpower source, compact size with high energy load-inq, hiqh color temperature and constant lumenmaintenance make then' ideal sources for these ex-acting applications. Tungsten Halogen lamps of sev-eral sizes, color temperatures and lumen outputs areavailable to meet the requirements of individualphotocopy machines. Some lamps have been de-signed with bromine instead of iodine to satisfac-torily meet the practical conditions of photocopyequipment.10

Figure 18. 5000 watt Tungsten Halogen lamp for studio,theater and television lighting,Often there is a need for a long, slender lamp that canbe mounted close to the copy paper that moves pastit. A Tungsten Halogen lamp with a continuouslylighted filament necessarily delivers more light to thecenter of the paper than near the edges under suchcircumstances, unless the filament is considerablylonger than the width of the paper. This uneven dis-tribution of light produces copies that are not ofuniform density.Segmented filament Iamps which overcome this dis-advantage are available. The controlled emission oflight along the length of the lamp is accomplished byusing tungsten rods inside the coiled filament at theplaces where no light is wanted. This produces alter-nate lighted and unlighted segments that give moreuniform light distribution, as shown in Figure 19.The two standard types currently available are the1000 watt, 120 volt and 230 volt lamps with fila-ment length of I0 inches.

Figure 19. Relative illumination at a distance ol3-3116"from the axis of the 1000 watt segmented TungstenHalogen lamp.Although it is beyond the scope of this bulletin toexplain the various photocopy processes and des-cribe the liqht and heat sources that are used, a des-cription of the direct electrostalic process using

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Tungsten Halogen lamps should be of interest. Fig-ure 20 pictures the operation of this process in aphotocopy machine. In the direct electrostatic pro-cess the image of the material to be copied is formeddirectly on the final copy paper and, therefore, doesnot have to be transferred to it. Photoeiectricallysensitive paper is first given a negative charge. It isthen exposed to the image projected by a lens system

through air, many gasses and glass, but will travelonly a short distance through most liquids andsolids. When infrared radiation strikes a material thatabsorbs it, the energy is converted into heat. Thetransfer of this heat by conduction through thematerial raises its temperature. The near infrared re'gion, which is the band closest to the visible red light,is the most important for heating purposes.One of the radiant heat products on the market is acompact heat module that uses 750 watt single-ended Tungsten Halogen Iamps. It will furnish a con-centration of 45KW per square foot and tempera-tures up to 2000"F. Applications include annealing,brazing, heat treatment, curing protective coatings,and drying paints and adhesives.Another radiant heat source is a heat gun that usestwo 750 watt or 1000 watt Tungsten Halogen lamps.The gun can be used for brazing tubing and joiningsilver, copper, stainless steel and other metals. Alsoavailable are portable hinged circular furnaces thatfit around pipes for brazing of pipe joints. These usevarious quantities of 750 watt single-ended TungstenHalogen lamps, depending on the diameter of theunit.Although much of this information and data onTungsten Halogen Iamps is available in various publications and bulletins, this is the first attempt to com-pile it together in one bulletin. Because of the rela-tive newness of Tungsten Halogen lamps in the light-ing industry and their dynamic growth in the pastdecade it is impossible to include all technical dataand complere information on the many applicationsfor these light sources.This bulletin obviously will not answer every possi-ble question on Tungsten Halogen lamps. However,it is hoped that it is comprehensive enough to give abetter understanding of the characteristics of Tungs-ten Halogen lamps, the reasons for certain restric-tions on their use and the countless applications thatthey handle better than any other light source.

CAUTION: OPERATES UNDER PRESSUREAND MAY SHATTERUse in equipment with a suitable screen to protectpeople and surroundings. Do not operate in closeproximity to persons, combustible materials orsubstances affected by heat or drying. Do notoperate over I l0% rated voltage because such op-eration increases pressure, tendency to shatterand ultraviolet output that may cause skin andeye irritation with prolonged exposure. Protectbulb from abrasions and scratches. Do not insertlamp when power is on. Follow operating instruc'tions.

Figure 20. Operating diagtam of direct electrostaticphotocopy machine with Tungsten Halogen and quartzin{rared lamps.and Tungsten Halogen lamps. This forms an electro-static pattern on the paper that duplicates the original image. The paper passes through the toner sys-tem in which the positively charged toner powderadheres to the negatively charged electrostaticimage. Quartz infrared lamps are used to fix theimage, and the copy corr,es out dry.SPECIAL APPLICATIONSBecause the radiant energy from Tungsten Halogenlamps is approximately 70 per cent infrared theymake ideal heat sources for supplying instant, con-centrated radiant heat. Infrared energy travels at thespeed of light, 186,000 miles per second. It will pass

OPERATING INSTRUCTIONSKeep lamp seal temperature below 650"F andbulb wall temperature above 500'F. This lamp isdesigned for operation in circuits not exceedingrated voltage. This lamp should be burned insockets and equipment approved for its use.Handle lamp only with wrapper attached, If ne-cessary to touch lamp during installation, cleanthe quartz with alcohol and dry with clean, softcloth before operation. Contamination of thequartz may result in reduced lamp performance.

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SYLUANIA

Location SalesOffices{TO OBTAIN SALES ANDTECHNICAL INFORMATION}DistributionCenters(TO ORDER LAMPS AND TO OBTAIN SHIPPINGINFOR MATION)WAR EHOUSE STOCKSMAINTAINED IN THES E LOCATIONS Zip Codeip Code

Atlanta, Ga. 21 15 Sylvan Rd., S.W404 762-1-741 21 15 Sylvan Rd., S.W404-762 17410344 30344Boston, Mass. 60 Boston Street, Salem, MA617,7-77-1900 X3473 105 Andover Street, PO. Box 372 Danvers, MA01970 617-777-1900 X2866 01923Butfalo, N.Y 25 Dewberry Lane, Gardenville lnd. Park716-668-7559 25 Dewberry Lane, Gardenville lnd. Park716-668 75554224 14224Charlotte, N.C. 381 1 Norih Davidson St., P.O. Box 5246704-334,46-71 381 1 North Davrdson St., P.O. Box 5246-704-334-461124225 28225Chicago, lll. 8O0 Devon Ave., Elk Grove Village, lllinors312-593-3400 60007

800 Devon Ave., Elk Grove Village, lllinols312 593-3400 60007Elk GroveCincinnati, Ohio 5480 Creek Road513 793 6440 5480 Creek Road513-793-64405242 45242

Cleveland. Ohio 4848 West 130th Street216,267 6800 4848 Wesl 130th Street44135 216-267-6800 44135Dallas. Texas 2o4o McKenzie Dr - P O. Box 5018. Carrollton, TX 2040 McKenzie Dr., PO. Box 5018, Cafiollton, TX(CarrolltonDenver, Colorado

214 247 -7800 75011-5018 214-241 laOA 7501 1,501880216675 Holly Street303-399-1760 80216 4675 Holly Street303 399,',I760

Detroit, Michiqan 10800 Ford Road. Dearborn. Ml313-582 8754 10800 Ford Road, Dearborn, Ml313-582-8754 4A126Harttord, Conn. 100 Constitution Plaza203-249-5823

4A12606103 lOb Andover Street, P.U.617 177 1900105 Andover Street, P.O. Box 377, DaDanvers, MA01923

Honolulu, Hawaii 770 Kapiolani Blvd. Suite 513808,536 5267 1811 Adrian Road, Burlingame, Calif.415,697,35006813 94010Houston, Texas 1440 Greengrass Dr713 869-8671

1440 Greengrass Dr.713-869 86717008 77008Kansas City, Kansas 450 Funston Road913-371-3773 450 Flrnston Road913 371 ,377366115 661 15

Los Angeles, Calif. 6505 East Gayhart Street, P.O. Box 2795213,726 1666 90051 6505 East Gavhart Street213.726-1666 90040Minneapolis, Minn. S330lndustrial 8lvd. N.E., Fridley, Minn.612-571-9400 5330lndustrial B vd. N.E , Fridley, Minn.612 571-9400FNew Orleans, Louisiana 55l0Jefferson Highway504-733-6970 5510Jefferson H ghway504-733-69700183 70183New York, New York 237 Park Avenue. 9th Floor212 503-1010 1000 Huyler Street, Teterboro, N.J.212-244 -88200017 07608Orlando, Florida 7492 Chancellor Drive, P.O. Box 13327,A305-859-6220 7492 chancelior Dr ve. P.O. Box 13327A32859 305 859-6220 32859Philadelphia, Penn. 465 Devon Park Drive- P.O. Box 500. Devon, PA 465 Devon Park Drive. P.O. Box 500, Devon, PA19333215-293 9330 19333 215-293,9330Pittsburgh, Penn. 450 Butler Street, P.O. Box 9544412-741-4533 450 Euiler Street, P.O. Box 9544412 7A1-45335223 15223St. Louis, MissouriSan Francisco, Calil.

5656 Campus Parkway, Hazelwood, MO 5656 Campus Parkway, Haze wood, MOIt ssts 63042 314 731-5515 63042HA?AI\^,6^.1) 314-741811 Adrian Road, Eurlingame, Calif415-697-3500 1811 Adrian Road, Burlingame, Calif.415-697,3500 94010Brrrlinoame 94010

98108eattle, Washington 750 So. Michigan Street206,763-2660 750 So. Michigan Street206 763-2660 98108Teterboro, New Jersey 1000 Huyler Street201 2Aa-9484 1000 Huyler Street201-288-94847608 07608Washlngton, Oc: 6610 Electronic Drive, Springfield, VA - 6610 Electronic Drive, Springfield, VAidiiingfi% .vul- uog-ssa-gtoo - zzlst ror'osa gtoo zztst

GTE Products Corp.Lighting CenterDanvers, Massachusetts 01923

Sylvania Engineering Bulletin - Tungsten Halogen Lamps 1988

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Transcript of Sylvania Engineering Bulletin - Tungsten Halogen Lamps 1988