![]() ![]() Aperture lamps were commonly used in photocopiers in the 1960s and 1970s where a bank of fixed tubes was arranged to light up the image to be copied, but are rarely found nowadays. Aperture lamps include reflectors over the non-aperture area. Another example is color matched aperture lights (with about 30° of opening) used in the food industry for robotic quality control inspection of cooked goods.Īperture lamps have a clear break in the phosphor coating, typically of 30°, to concentrate light in one direction and provide higher brightness in the beam than can be achieved by uniform phosphor coatings. An internal reflector is more efficient than standard external reflectors. For example, these lamps can be used in tanning beds or in backlighting electronic displays. Reflector lamps are used when light is only desired to be emitted in a single direction, or when an application requires the maximum amount of light. Coverage of the reflector ranges from 120° to 310° of the lamp's circumference. Some lamps have an internal opaque reflector. Reflectors Cross section of a typical fluorescent lamp with and without a reflector Whereas for T16 and T26–T38, the number indicates the approximate tube diameter in millimeters. Large size for 90W T17 (preheat) and 40W T17 (instant start)įor T2–T12 and T17, the number indicates the tube diameter in 1⁄ 8 inches, e.g. These aren't as efficient as newer lamp options. One of the first diameters of fluorescent lamps, with the 15W T12 and 20W T12 having been introduced in 1938. Circular 32W and 40W T10 lamps (Older versions of the 32W and 40W T9 lamps). ![]() High-lumen retrofit lamps for 40W T12 lamps.The North American energy-saving T8 lamps weren't introduced until the 1980s. One of the first diameters of fluorescent lamps, with the 15W T8 and 30W T8 having been introduced in 1938. Single-pin fluorescent lamps used in display cases. Thorn/General Electric 2D fluorescent lamps and other similar lamps from various manufacturers.Panasonic’s range of FHL fluorescent tubes in 18W, 27W, and 36W varieties for the Japanese market.Two newer ranges, high efficiency (HE) 14–35 W, and high output (HO) 24–80 W, introduced in the 1990s.Original 4–13 W range from 1950s or earlier.Power ratings and lengths not standardized (and not the same) between different manufacturers Osram's Fluorescent Miniature (FM) tubes.Typical diameters are T12 or T38 ( 1 + 1⁄ 2 in or 38 mm) for magnetic or electronic ballasts, T8 or T26 (1 in or 25 mm) for smaller and often energy-saving lamps with magnetic or electronic ballasts, and T5 or T16 ( 5⁄ 8 in or 16 mm) for very small lamps, which may even operate from a battery-powered device.įluorescent tube diameter designation comparison The T indicates that the shape of the bulb is tubular, and the last number (yy) is the diameter in eighths of an inch (sometimes in millimeters, rounded up to the nearest millimeter). In the United States and Canada, lamps are typically identified by a code such as FxxTyy, where F is for fluorescent, and the first number (xx) indicates either the power in watts for bi-pin lamps, length in inches for single pin and high output lamps, or for circular bulbs the diameter of the circular bulb. Systematic nomenclature identifies mass-market lamps as to overall shape, power rating, length, color, and other electrical and illuminating characteristics. Since their introduction as a commercial product in 1939, many different types of fluorescent lamp have been introduced. For other types of lightbulb mounts and sockets, see Lightbulb socket. ![]()
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