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Lamps can be colored by blowing the bulbs from glass colored by chemical additives These bulbs are available in daylight blue, blue, amber, green, and ruby colors The light from these lamps is purer and more intense than that from surface-colored bulbs, making them suitable for theatrical and photographic studio lighting Among colored glass bulbs, daylight blue is the most popular These lamps suppress the emission of red and yellow light from the filaments, so their emission approximates daylight Colored glass bulbs cost more than coated bulbs, but are less efficient because they absorb about 35 percent of the emitted light
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A selection of lamp bases is illustrated in Fig 8-3 The most familiar incandescent lamp bases shown are the threaded brass and aluminum bases named after Thomas Edison, the inventor Medium screw-in Edison-type bases with diameters of 1 in across the threads are found on most general-purpose incandescent lamps rated for 300 W or less Mogul screw-in-type bases with 11 2-in-diameter bases are used on higherwattage lamps for street and industrial high-bay lighting Intermediate threaded 13 32-in-diameter bases are found on incandescent lamps for decorative luminaires such as candle sconces, and miniature screw-in-type 3 8-indiameter bases are on lamps for holiday light strings, games, and flashlights Bayonet bases with unthreaded metal shells and two diametrically opposed studs are used on low-voltage incandescent lamps To insert the lamp in its socket, it must be pushed down against spring pressure with the studs inserted in the L-shaped keyway When the studs reach the keyway bottom, the lamp is twisted to lock it in place The bi-post or two-pin base is used on high-wattage incandescent lamps The leads embedded in the glass base of the bulb are inserted into and soldered to hollow pins Other lamp bases have prongs, screw terminals, contact lugs, or single cup-type contacts
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The tungsten filament of an incandescent lamp is a resistor whose temperature is raised to incandescence within the bulb by the passage of electric current The mechanical
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Figure 8-3 Examples of incandescent lamp bases
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characteristics of the filament determine its electrical properties and those of the lamp The wattage rating of filament lamps is determined by applying Ohm s law: W V A
where V volts and A current in amperes The value of A is determined by dividing the applied voltage V by the resistance of the filament in ohms when it reaches incandescence Tungsten filaments are also used in tungsten-halogen and fluorescent lamps and various electron tubes Tungsten is a heavy, hard, ductile, and strong metal with a melting point of 3410 C (6170 F), the highest of any known metal Filament wire can be as fine as 10 to 15 m (00004 to 00006 in) in diameter in standard lamps, but in special lamps it can be as fine as 5 m (00002 in) Tungsten filaments in incandescent lamps have the following characteristics:
I Operating temperature is directly proportional to filament wire diameter and
inversely proportional to tungsten evaporation
I The higher the filament temperature, the greater is the emission in the visible part
of the light spectrum, and the more closely its emission approximates sunlight
I Incandescent lamps are only about 10 to 12 percent efficient The remaining 90 per-
cent of the input energy is dissipated as heat in the near-infrared (770- to 3000-nm) region, trailing off into the far-infrared region I Low-voltage lamps with thicker filament diameters are more efficient than highervoltage lamps with the same wattage rating I Lamps with higher wattage ratings are more efficient than those with lower wattage ratings operating at the same voltage In practical terms, a 150-W general-purpose lamp produces over 30 percent more light than three 50-W lamps when all are powered by 120 V Incandescent lamps can have many different forms of straight and coiled filaments Lamp manufacturers classify these forms with an alphanumeric code Some examples of various tungsten filament shapes are shown in Fig 8-4 The designations of those shown begin with the letter C (for coiled) or CC (for coiled coils) Most standard incandescent lamps in the 50- to 1000-W range have coiled filaments They are more effective than straight filaments in gas-filled bulbs because they reduce filament heat losses from conduction and convection through the gas It was also found that individual turns in the coil tend to sustain the heat in adjacent coils, and that coiled filaments are mechanically stronger than straight filaments The effective length of a filament can be increased in a given space by coiling the wire before forming the larger coils These denser filaments permit higher-wattage lamps in smaller bulb sizes The relatively small diameters of bulb necks make it difficult to insert horizontal filament assemblies in a bulb This was overcome by with vertical filaments such as C-8 and CC-8 of Fig 8-4 (an example of this filament is shown in Fig 8-1) In addition to simplifying lamp manufacture, vertical filaments provide higher light emission
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