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Hot-cathode, preheat-starting Hot-cathode, rapid-starting Hot-cathode, instant-starting Subminiature Cold cathode Compact
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STANDARD FLUORESCENT LAMPS
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Fluorescent lamps can produce 50 to 100 lm/W, making them 4 to 6 times more efficient than incandescent lamps In general, a quality fluorescent lamp can produce 3 to 4 times the light output of an incandescent lamp with an equivalent wattage rating For
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Figure 8-5 Cutaway view showing the construction of a hot-cathode, preheat-starting fluorescent tube
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Figure 8-6 Standard fluorescent lamp bulb and base shapes
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example, a 15-W fluorescent lamp can produce as much light as a 60-W incandescent lamp About 90 percent of its energy is converted into light, with the remaining dissipated as heat (near-infrared) radiation The fluorescent spectral distribution curve closely conforms to the visible light spectrum of 380 nm (violet light) to more than 770 nm (red light) All fluorescent tubes and bulbs run cooler than incandescent lamps because of their higher efficiency The shapes and styles of fluorescent lamps are illustrated in Fig 8-6
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I Tubular bulb lamp sizes are identified by a code consisting of the letter T (desig-
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nating that the bulb is tubular in shape) followed by a number that expresses
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LIGHTING, LAMPS, AND LUMINAIRES
the diameter of the tube in eighths of an inch Their diameters vary from 1 4 in for the T-2 to 11 2 in for the T-12 Fluorescent tube lengths range from 6 to 96 in, measured between the ends of their bases For example, the overall length of the rapid-start T-12, 48-in lamp is actually 473 4 in Subminiature T-2 fluorescent lamps have axial bases on the ends of the tubes Preheat and rapid-start lamps require four electrical contacts, so they have two-pin bases at each end Standard T-5 lamps have miniature bi-pin bases, while both T-8 and T-12 lamps have medium bi-pin bases I Circular bulb fluorescent lamps are available in four outside diameters: 61 2, 8, 12, and 16 in There are also U-shaped fluorescent tubes with T-8 and T-12 bulbs The widths of U-shaped tubes are measured between their ends, and their overall lengths are measured from the faces of the bases over the outsides of the glass bends I U-shaped fluorescent lamps have bi-pin bases at the tube ends, while circular lamps have four-pin bases positioned in the gap between the opposing ends of their circular tubes High- and very-high-output lamps have recessed double-contact (RDC) bases By contrast, Slimline instant-start lamps require only two electrical contacts, so they have single-pin bases at each tube end
FLUORESCENT LAMP CHARACTERISTICS
Standard fluorescent lamps are available with four different starting methods
I Preheat fluorescent lamps are hot-cathode fluorescent lamps with two-pin bases
They require starters that pass current through their filament cathodes to heat them Emission from the cathodes occurs only after they have been preheated There is a time delay at turn-on before these fluorescent lamps reach full brightness, but this drawback is offset by savings in the cost of ballasts and longer lamp life The switch and starter connected across the lamp can be either automatic or manual I Instant-start (IS) fluorescent lamps require specially designed instant-start ballasts that deliver voltages high enough to start fluorescent lamps as soon as the power is applied, so no cathode preheating is required These voltages decrease to normal operating voltages after the lamps have started IS ballasts use from 15 to 32 W less per lamp than rapid-start (RS) ballasts Because IS fluorescent lamps do not require preheating, the bases on each end of the lamp require only a single pin IS ballasts were developed to eliminate separate mechanical starter devices Slimline fluorescent lamps operate only on instant-start ballasts Some IS ballasts can start a lamp within 50 ms I Rapid-start (RS) fluorescent lamps are the most popular fluorescent lamps RS ballasts apply low voltage to the cathodes prior to lamp ignition to accelerate the starting interval, and then provide continuous cathode heating as long as the lamp is energized to maintain light output at efficient levels A built-in electrode heating coil in the ballast permits the lamp to reach full brightness almost as quickly as an IS fluorescent lamp RS lamps eliminate the need for separate starter switches, and their ballasts can be either electromagnetic, electronic, or hybrid Full-range fluorescent lamp dimming is possible only with RS lamps I Standard preheat rapid-start (RS) fluorescent lamps can be operated from either preheat or RS ballast circuits
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