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The efficacy of fluorescent tubes ranges from about 16 lumens per watt for a 4 watt tube with an ordinary ballast to over 100 lumens per watt [51] with a modern electronic ballast, commonly averaging 50 to 67 lm/W overall. [52] Ballast loss can be about 25% of the lamp power with magnetic ballasts, and around 10% with electronic ballasts.
LED tubes. LED tube is a type of LED lamp used in fluorescent tube luminaires with G5 and G13 bases to replace traditional fluorescent tubes. [1] As compared to fluorescent tubes, the most important advantages of LED tubes are energy efficiency and long service life. LED tubes are sometimes also referred to as ‘LED fluorescent tubes’.
In the 1970s, 34-watt energy-saving F40T12 fluorescent lamps were intoroduced in the United States. In the 1980s, T8 32-watt lamps were introduced, [8] but unlike the T8 tubes introduced in Europe, these T8s are not retrofits and require new matching ballasts to drive them. These ballasts were originally magnetic, but most today are electronic.
The 6528 regulator tube is a medium mu triode, high current twin triode which provided low current drop and control sensitivity. It allowed fewer tube passing sections and permitted lower range control circuits. Rated at 60 Watts max plate dissipation per tube and 400 max plate voltage. [135]
Mazda brand bulbs at the Edison and Ford Winter Estates Edison Mazda light bulb tester, logo by Maxfield Parrish, at the Corning Museum of Glass. Mazda was a trademarked name registered by General Electric (GE) in 1909 for incandescent light bulbs.
In 1945 Burlew sold the remainder of the company, the tube division, to General Electric; this became GE's primary tube making facility. [4] In 1987, GE sold the company to a group of investors who formed a company called MPD, Inc. [5] From 1921 to 2006 the building served as home to Smith Machine and Supply, Inc.
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