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Fluorescent Luminaires and Ballasts
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Standard fluorescent lamps require dedicated luminaires with compatible ballasts to operate them because they cannot be inserted into 120-V AC sockets Figure 8-8 is an exploded view of a typical two-tube fluorescent luminaire The base pan of the luminaire is formed from light sheet metal, usually painted white to blend in with the ceiling on which it is mounted The four tube sockets are fastened to the corners of the base pan A sheet-metal coverplate protects the wiring and ballast After the base pan is bolted or screwed to the ceiling or an appropriate overhead support, the wiring connections are made The metal cover protecting the ballast and wiring is then clamped in position After installing the tubes and testing the fixture, the translucent plastic diffuser is positioned over the lamps and snapped into the base pan
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High-Intensity Discharge (HID) Lamps
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A general class of lamps called high-intensity discharge (HID) includes mercury-vapor, metal halide, and high-pressure sodium lamps All electric discharge lamps include cylindrical transparent or translucent arc tubes that enclose the mercury, various gases, and metal salts and confine the electric discharge The arc tubes are enclosed in a glass bulb which performs three functions:
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I Excludes air to prevent oxidation of metal I Stabilizes operating temperature of the lamp I Reduces ultraviolet radiation emitted by the excitation of the vapors
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HID lamps are packaged in a wide range of bulb styles, including BT, E, ET, PAR, R, and T There are also specialized double-ended and single-ended styles The bases include a range of screw-type, bayonet, and ceramic styles Some HID lamps are designed for base-up, base-down, or horizontal operating positions, while others can be operated in any position Like fluorescent lamps, all HID lamps require ballasts
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LIGHTING, LAMPS, AND LUMINAIRES
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Figure 8-8 Exploded view of the parts of a two-tube fluorescent luminaire
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These lamps operate at high pressures and very high temperatures They can be ruptured by mishandling, misapplication, or ballast failure An arc-tube rupture can burst and shatter the outer glass bulb, resulting in an explosion that scatters glass fragments at temperatures as high as 1832 F (1000 C) To reduce the risk of personal injury, property damage, or fire, the lamp must be enclosed in a rigid housing with a combination lens and diffuser that can contain these hot fragments HID lamps give full light output over a wide range of ambient temperatures This makes them suitable for street, stadium, and parking lot lighting as well as building floodlighting and interior highbay illumination
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MERCURY-VAPOR (MV) LAMPS
Mercury-vapor (MV) lamps produce most of their light from the excitation of mercury atoms A small amount of liquid mercury, which is vaporized, and argon gas fill is
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sealed within a quartz arc tube mounted inside the MV lamp s outer glass envelope The construction of an MV lamp with a phosphor-coated bulb is shown in Fig 8-9 After arc-tube warmup, it emits both ultraviolet (UV) and visible blue-white light that enhances yellow, green, and blue surfaces but dulls red and orange surfaces MV lamps have correlated color temperatures (CCTs) of 3000 to 7000 K The color rendering indexes (CRIs) of standard MV lamps range from 15 to 25, while those with phosphor-coated bulbs are 40 to 55 The efficacies are from 30 to 65 lm/W MV lamps are used in both indoor and outdoor lighting where good efficiency and long life are required, but color rendering is only moderate Complexions look greenish or very pale in this light However, by phosphor-coating the bulb for color correction as is done with fluorescent lamps, an MV lamp s output color can be made to appear more natural Correction adds a warmer purplish tone that enhances red, yellow, and blue surfaces while dulling green surfaces Corrected MV light is similar to cool-white fluorescent light in giving complexions a ruddy tone Correction also boosts light output and improves the lamp s efficacy MV lamps have longer lives than other HID lamps (up to 24,000 hrs), but cost less They are available with wattage ratings of 40 to 1000 W
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