Z. wl J 4 live Publication No. DP-108 Copyright 1920 by Duplex Lighting Works Manufactured by DUPLEX LI GHTl NG WORKS OF GENERAL \ Wy, ELECTRIC CO. )U PLEX" (LIGHTING F eS Necessary T= Rerinement & Tips 6 WEST 48 th. STREET NEW YORK CITY Duplexalites are sold by Electrical Dealers and Contractors WITHOUT DUPLEXAL Examples of Good and Bad Lighting Using the Same Lamp and Shade Two ido el omoOO Mn GETING? Brome hte sound orethe Shady Side of a Tree on a Sunny Afternoon ET US substitute for the sun a MAZDA C lamp, for the sky the ceiling of your room, and for the tree the Duplexalite. From the ceiling you now get a soft radiance which floods the entire room as completely as though it were open to the sky. From the diffusing disc of the Duplex- alite, you get a generous addition of light directly beneath, which has all the directional qua.ity of sunlight filtered through foliage. At the same time, the Duplexalite is protecting your eyes from the brilliancy of the MAZDA C lamp as comfortably as the tree offers protection from the glare of the sun. You can no more dispense with the ceiling re- flection than you can the sky. Nor would the unshaded brightness of the MAZDA C lamp offer any more advantage to see by than the desert sun at noon. By means of Duplexalite, the MAZDA C lamp has been equipped in a way to produce the most charming lighting effect that occurs in nature. Good lighting is the proper distribution of light. Three THE MAZDA C LAMP The MAZDA C Lamp is the Sun of Artificial Lighting E all know what happened to the man who took a long look into the face of the noon-day sun’ before smoked glasses wereinvented. Of course it was unnecessary. It is equally unnecessary to gaze directly at the filament of the MAZDA C lamp. The MAZDA C lamp surpasses all others in efficiency, both when new and throughout the useful life of each lamp. After much study and experiment, devices have been designed to control this wonderful brightness and distribute it wisely for the benefit of eyes and nerves, to our great comfort and efficiency. To use such devices is not only desirable, but necessary. When this is done the MAZDA C lamp provides the best lighting obtainable and at the least expense. The highest efficiency lamps that are made in small sizes are the MAZDA B lamps. The following diagram illustrates the economy of using a MAZDA C lamp instead of several smaller lamps baa - 9 - THREE 60-WATT MAZDA B LAMPS USE 180 WATTS AND GIVE 17262 LUMENS (UNITS OF LIGHT) Val her dy fe ~~ 4 WwW IN f oF ‘ } wae ONE 160-WATT MAZDA C LAMP USES 150 WATTS AND GIVES 2049 LUMENS ‘UNITS OF LIGHT) WV elon ls) a el eC eC INCs The Duplexalite Shades the MAZDA C Lamp and Diffuses its Brightness [DUPLEX Lighting is the natural method of light distribution because it combines a day-like dif- fusion with direct lighting where most needed. In every other method of illumination, the element of direct lighting is either lacking or is radiated at unnatural angles at which the eye has no protection. The result is the sensation commonly complained of as “‘glare.”’ In a Duplexalite, more than 96% of the light given off is deflected in useful directions; that is, upward for ceiling reflection and downward for ad- ditional intensities—Duplex Lighting. Less than 4% of the light is given off at angles which produce glare, as compared with the usual 30% to 45% with other systems in which any appreciable amount of direct lighting is provided. The diagram below indicates the principles of Duplex Light- ing and the typical design of the Duplexalite Five The Standard Duplexalite STANDARD DUPLEXALITES THE Standard Duplexalite is the basis of all forms of Duplexalites. It consists of the ceiling plate or canopy adapted to all standard ceiling outlets, a suspension made of specially constructed silk-covered cable with strain-relief grips at top and bottom, lamp socket, a characteristic metal deflector and moulded glass disc, all in the correctly focused position for the rated sizeof MAZDA Clamp. The deflector, socket-cover and canopy are finished in a matt-surfaced ivory porcelain enamel. The in- terior reflecting surface is of polished white enamel. Wattage of Length Diameter of Number Lamp Socket Over All Deflector D-131 100-150 Medium 36/” 12/0 200 Medium 48” 14” 300-500 Mogul 60/" 16” The Duplexalite is adapted to any requirement where gocd lighting is sought. In the home it can he used in every room—kitchen, dining room, living room, library, nursery, bedrooms, bathrooms, etc. Below is a picture of the kitchen of the Good Housekeeping Institute. The Duplex- alite was tested by their department of Household Engineering and was awarded the official approval of the Institute, Serial Number 2009. proeiidiati oe. eee eee ema Good Housekeeping Institute Kitchen Seven DECORATIVE POSSIBIUI Ti Bs Gr DUPER XS IGE ING The Unseen Duplexalite Enhances a Beautiful Shade and Produces a Beautiful Lighting Effect HE characteristic distribution of light from the Duplexalite opens up an entirely new field of decorative possibilities. The self-illumination of the Duplexalite reflector is sufficient to attractively illuminate any form of decorative shade without interfering in any way with the upward and downward lighting. Duplex- alite shades are illuminated for the purpose of beautifying them, instead of being over-lighted for the purpose of general illumination. This permits of the use of almost any translucent fabric which may happen to meet a decorative requirement or suit an individual taste. The illumination produced a » with a Duplexalite is unchanged by the addition of the shade. Examples of Duplex Lighting with and without a shade Eight PHANTOM VIEW OF EMPIRE DURE ESSAI TE es this illustration a Duplexalite shade (of silk) and the Duplexalite deflector (of metal) are shown as transparent in order to illustrate clearly the mechanical construction of this effective lighting device, All light from the brilliant fila- ment of the MAZDA C lamp is utilized in the following way: 1—From the top of the deflector a large portion of the rays go directly from the lamp to the ceiling. 2—All rays intercepted by the metal deflector, which is white enam- eled inside, are deflected either upward to the ceiling or down- ward through the diffusing disc. 3—The rest of the light rays go directly from the lamp to the glass diffusing disc, through which the direct light is filtered to an agreeable softness. 4—A small amount of the light is reflected upward from the outer edge of the diffusing disc so that it illuminates the outside of the metal deflector. It is this which provides the soft beautifying illumination of the Duplexalite shade, In addition to the lighting ad- vantages, please note also the fol- lowing practical conveniences: 1—The Duplexalite shades may be removed by tilting and taking off sideways. They may be put away for the summer with the curtains, changed from warm colored silks in winter to bright figured cretonnes in summer, or changed from room to room in a few moments for special occa- sions. 2—Raising the metal deflector straight up a few inches unlocks the diffusing disc which may be washed as easily as a lunch plate, and may be locked into place again by merely raising and lowering the deflector. 3—The deflector is finished in por- celain enamel and is easily kept clean by occasional dusting. 4—Douplexalite construction affords the most perfect ventilation, thus insuring the longest life and efficiency of the MAZDA C lamp, - Nine Shade No. 5021 ON STANDARD DUPLEXALITE Ten Poe ie OUP EOxX AISLES ie Empire Shade is historic. In its dignified simplicity, it embodies the typical construction of all Duplexalite shades, consisting of an upper ring with projecting supports which rest on the deflector, and a substantial frame over which the shade is formed. Its conventional lines conform to the best standards of taste for a wide variety of uses. Empire Shades are made of silk gathered on the frame with silk lining and gimp trimmings. TheEmpire shade may be ornamented Wet Canwotet. changing the appearance cf dignity and simplicity. Em pire shadesare made in old rose, old gold, ecru or blue. Shade No. 5037 Reception Hall of a New York Residence which is lighted throughout with Duplexalite Eleven i tatoos PRN 924 ~—s Lccudiabae Shade No. 5020 and Tassel ‘*D”’ ON STANDARD DUPLEXALITE Twelve Pee ele ele iP LR DUPLEXALEPES TE decorative Empire shades are made of colored silks covered with figured net and trimmed with gold or colored braids to harmonize with the colored pattern. The delicate traceries are thrown into just the right relief on a Duplexalite. The patterns are consequently very effective, whether seen lighted or by daylight. Figured Net Shades are made in the following colors: Color “A*’—Blue and gold figured net over gold silk lining, trimmed with gold braid. Color "*B**—Net with ecru woven ground. Flowers in blue and mulberry. Gray silk lining. ‘Trimmed with blue braid. Color ""C*—Net with ecru woven ground. Flowers in old rose and blue. Old rose silk lining. Trimmed with old rose braid. TASSEL ‘“D"’—which is shown, covers the ivory socket cover and matches the old gold silk of the pendant. It is made of heavy silk fringe and can be put on at any time after the Duplexalite is installed. It is put on and taken off as easily and quickly as the Duplexalite shades. on ee Nik ae | Note how the Figured Net Shade Harmonizes with the Hangings in this Living Room Thirteen Shade No, 5010, Tassel ‘‘D’’ and Disc Screen ‘‘A’”’ ON STANDARD DUPLEXALITE Fourteen Die GeROOM DUPEEXALITES IDES Room Duplexalites are fitted with shades having the silk closely pleated and finished in ruching form at top and bottom. The silk lining is in every case of a warm colored tint. The Disc Screen is made of light silk trimmed with old gold braid, and covers the glass diffusing disc. Shade No. 5025 has double box pleated ruching at top and bottom and a heavy silk fringe. Dining Room Shades are made in ecru, old gold, old rose, delft blue, French gray or deep red. Disc Screens are made in old gold, old rose or ecru. Shade No. 5025 S i The table lighting filters through a gold colored silken disc cover while the furniture in the background is enriched by the general illumination Fifteen Painted Parchment Shade No. 5012 and Tassel ““D” ON STANDARD DUPLEXALITE Sirteen PAINTED PARCHMENT DUPLEXALITES UPLEXALITE Parchment Shades are made in the Empire form and bound with antique gold galloon. They are among the most finished productions obtainable in decorative shades. Shade No. 5059 Natural parch- ment, stripe top and bottom. (Blue unless otherwise specified). Shade No. 5051 Hand painted. Birds of Paradise and foli- age on an antique background. PLAIN PARCHMENT DUPLEXALITES Silk tassel for socket cover is not included, and the effect obtained is one of extreme sim- plicity and high quality. Plain Parch- ment Shades have an antique finishandare bound with an- tique gold gal- loon. Painted Parchment Duplexalites ina Bachelor’s Drawing Room Seventeen Shade No. 5015 and Tassel ‘‘D”’ ON STANDARD DUPLEXALITE ighteen Hela Goals) Che Le exe Ts eS THE most natural form of Duplexalite Shade is that made of suitable materials suspended from a supporting ring. Somewhat less formal than Empire Duplexalites, the Ring Duplexalites offer an opportunity for a more intimate style of decoration. Figured Silk Ring Shades, as illustrated on the opposite page, are finished with antique gold braid and ornamental antique gold fringe. Mulberry, blue or gold ground. Shade No. 5019, below, is of draped China silk in solid colors; old rose, old gold, ecru or blue. Silk braid edging at top and uncut silk fringe at bottom, weighted. oa Shade 5022 Cretonne shades are favored for Bedrooms; also for generalsummeruse. No.5018isanattractivenursery pattern. No. 5022 is furnished with either reds or yellow predominating, as ordered. Nineteen NO. 5605 DUPLEXALITES WITH SPECIAL SHADES Shade No. 5005 The Duplexalite Hanger is of draped silk, lined. shown has a rigid stem wound with rich Trimmed with antique silk cord. It is furnished with a special gold lace and bullion tassel of silk and bullion fringe, and a fringe. Made in colors special ceiling canopy finished in gold or as ordered. silver, as ordered. Twenty DUPLEXALITES WITH SPECIAL SHADES Shade No. 5004-A Shade No. 5024 Shade No. 5004-B Black Japanese figures Octagonal shade, on ecru ground. shirred silk with fringe dark background. and antique gold braid. Made in colors as ordered, Oriental pattern, on a Twenty-one Shade No. 5052 Antique gold lace over silk. Bullion and silk fringe.* Shade No. 5026 Heavy, old gold silk fringe. Gold braid. Twenty-two & SHA Shade No. 5040 Gold metal lace over shirred _ silk. Gold braid and flowers.* *Made in colors as ordered. iat! DUPLEXALITES WITH SPECIAL S DE NO. 5035 HADE Shade No. 5035 Draped chiffon over silk; Galloon braid and flowers.* Shade No. 5002 Stretched silk, gold and silk braid.* THE ETRUSCAN DUPLEXALITE Dull glazed porcelain enamel in shaded golden brown, decoration fused into the surface in darker tone. Designed for requirements where a neat, though rich, ornamental fixture is appropriate and no shade is desired, Twenty-three Duplexalite Diffusing Disc Disc Screen **B”’ Tassel ‘‘D’’ HE DIAGRAM below shows the proper hanging length to obtain most uniform light distribution. The shadow line (A) should meet the junction of ceiling and walls. For home lighting, evenness of illumination is not always neces- sary and the length may be increased, if desirable; although in most cases the hanging length, as sketched, will provide the most satisfactory appearance as well as the best lighting. The length is easily adjusted to suit the requirements when the Duplexalite is being installed. Hanging Length No. D-29 “‘Pullite’’ Canopy Switch should be specified where there is no wall switch. Ly Twenty-four DUPLEXALITES Wattage Length Diame- of Lamp Socket overall ter Price D-131 Standard Duplexalite 100-150 Medium 36” 12/* $16.00 D-231 ii 200 Medium 48” 14” 19.00 D-531 ae 300-500 Mogul 60’ 16” 24.00 D-131 Etruscan Duplexalite 100-150 Medium 36’ QE 20.00 D-231 SE = 200 Medium 48” 14” 25.00 D-531 as 300-500 Mogul 60” 16” 30.00 D-4131 Duplexalite Pg. 20 100-150 Medium 36” 12% 47.50 D-4231 hs 200 Medium 48” 14” 52.50 D-4531 oe 300-500 Mogul 60’ 16" 60.00 Prices not including Mazda C Lamp. For Pullite Canopy Switch add $2.00. DUPLEXALITE SHADES 100 Watt 200 Watt 500 Watt Shade Frame Shade Frame Shade Frame No. Complete Only Complete Only Complete Only S-5002 $24.00 $4.50 $26.00 $5.25 $30.00 $6.00 S-5003 34.00 3.75 41.50 4.50 48.00 6.00 S-5004 32.00 3.75 38.00 4.50 45.00 6.00 S-5005 28.00 She 32.00 90 42.00 1.35 S-5010 18.00 1.80 22.00 2.10 30.00 3.00 S-5011 7.50 1.80 8.50 2.10 10.50 3.00 S-5012 17.00 1.80 20.00 2.10 26.00 3.00 S-5015 7.00 Pi 9.00 90 12.00 1.35 S-5018 5.00 m3) 5.50 90 6.00 1.35 S-5019 7.00 15 7.50 90 10.50 1.35 S-5020 8.50 1.80 10.50 2.10 15.00 3.00 S-5021 8.00 1.80 10.00 2.10 13.50 3.00 S-5022 4.00 75 5.00 90 6.00 1.35 S-5024 29.00 4.50 34.00 5.25 45.00 7.50 S-5025 52.50 2.55 60.00 3.00 72.00 4.50 S-5026 26.00 1.80 37.00 2.10 53.00 3.00 S-5035 22.50 1.80 25.00 2.10 30.00 3.00 S-5036 12.00 1.80 13.50 2.10 15.00 3.00 S-5037 10.00 1.80 12.00 2.10 15.00 3.00 S-5040 54.00 2.55 58.00 3.00 65.00 4.50 S-5051 15.00 1.80 18.00 2.10 27.50 3.00 S-5052 30.00 1.80 35.00 2.10 42.00 3.00 S-5059 8.50 1.80 9.00 2.10 12.00 3.00 ACCESSORIES ' 100 Watt 200 Watt 500 Watt Frame Frame Frame Complete Only Complete Only Complete Only Disc Screen ‘‘A’’ $2.50 $ .60 $3.00 $ .75 $4.00 $ .90 Disc Screen ‘‘B’’ 1.50 .60 2.00 .75 3.00 .90 Stem Tassel ‘‘D’* 3.50 3.50 5.00 On shades where color is optional we will match samples submitted as nearly as possible. On shades where definite colors are species an additional charge of 3314% will be made for delivery in colors not listed—and orders wil! be subject to delayed shipment. 200 watt shades made to fit 100 watt Duplexalite—add 10%. 500 watt shades made to fit 200 watt Duplexalite—add 10%. Prices subject to change without notice DP-108A 9/20 ae THE PHILADELPHIA ELECTRIC COMPANY SUPPLY DEPT. 132 South Eleventh Street. Philadelphia