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 in North America.The North American energy-saving argon T8 lamps weren't introduced until the 1980s. The European energy saving krypton T8 lamps introduced by Thorn EMI at the 1970's. One of the first diameters of fluorescent lamps, with the 15W T8 and 30W T8 having been introduced in 1938. 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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