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A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow.
Typical diameters are T12 or T38 (1+1⁄2 in or 38 mm) for larger, often less efficient lamps, T8 or T26 (1 in or 25 mm) for smaller and often energy-saving lamps, and T5 or T16 (5⁄8 in or 16 mm) for very small lamps, which may even operate from a battery-powered device. Fluorescent tube diameter designation comparison. Designation.
A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fit into light fixtures designed for incandescent bulbs. The lamps use a tube that is curved or folded to fit into the space of an ...
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An electrical ballast is a device placed in series with a load to limit the amount of current in an electrical circuit. A familiar and widely used example is the inductive ballast used in fluorescent lamps to limit the current through the tube, which would otherwise rise to a destructive level due to the negative differential resistance of the ...
The squadron is equipped with the F-22 Raptor fighter. [1] The 90 FS is one of the oldest units in the United States Air Force, first being organized as the 90th Aero Squadron on 20 August 1917 at Kelly Field, Texas. The squadron deployed to France and fought on the Western Front during World War I as a Corps observation squadron. [2]
The 199th Fighter Squadron is a unit of the 154th Wing. They operate the F-22A Raptor, the Air Force's 5th generation fighter aircraft with a select component of active duty personnel acting in the cadre role. Its combination of stealth, supercruise, maneuverability and integrated avionics, coupled with improved supportability, represents an ...
The Nittany Lions jump ahead of Georgia, which stays put at No. 4. Ohio State slips to No. 5. No. 6 Miami (Fla.) and No. 7 Alabama hold their positions from last week, with LSU, Clemson and ...
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