Despite the difference in appearance, fluorescent lights are constructed in similar fashion. In "neon lights," there not always is a phosphor coating because the inert gas can give off its own color.The gas in the tube is a mercury vapor and some inert gas, such as neon, argon or xenon.
A fixed voltage drop occurs at the electrodes, which also produces heat. Regular Fluorescent Lamp 12. Suppression of radio interference is possible. Later other compounds were discovered, allowing differing colors of lamps to be made.The terminal voltage across an operating lamp varies depending on the The performance of fluorescent lamps is critically affected by the temperature of the bulb wall and its effect on the partial pressure of mercury vapor within the lamp.Only a fraction of the electrical energy input into a lamp is converted to useful light. Gribben, John; "The Scientists; A History of Science Told Through the Lives of Its Greatest Inventors"; Westinghouse Engineer, Volume 12–13, Page 141, 1952T12 specifies the bulb's diameter in 1/8 inch units; a T12 bulb is 12×(1/8) inches or 1.5 in (38 mm) in diameter.National Research Council (U.S.). Some lamps have the tube bent into a circle, used for table lamps or other places where a more compact light source is desired. Fluorescent tube lights are common fixtures. She holds a Master of Science in engineering from the Georgia Institute of Technology.
Electromagnetic ballasts may also cause problems for video recording as there can be a so-called Fluorescent lamps with electronic ballasts do not flicker, since above about 5 kHz, the excited electron state half-life is longer than a half cycle,Systematic nomenclature identifies mass-market lamps as to general shape, power rating, length, color, and other electrical and illuminating characteristics. Under standard test conditions fluorescent lamps last 6,000 to 80,000 hours (2 to 27 years at 8 hours per day).The higher initial cost of a fluorescent lamp compared with an incandescent lamp is usually compensated for by lower energy consumption over its life.Compared with an incandescent lamp, a fluorescent tube is a more diffuse and physically larger light source. More important than these was a patent covering an While the Hull patent gave GE a basis for claiming Even though the patent issue was not completely resolved for many years, General Electric's strength in manufacturing and marketing gave it a pre-eminent position in the emerging fluorescent light market. Additionally, argon atoms, excited to a metastable state by impact of an electron, can impart energy to a mercury atom and ionize it, described as the Fluorescent lamp tubes are often straight and range in length from about 100 millimeters (3.9 in) for miniature lamps, to 2.43 meters (8.0 ft) for high-output lamps. The first phosphors were synthetic versions of naturally occurring fluorescent minerals, with small amounts of metals added as activators.
The photons of inert gas are in the visible range, but the photons emitted by mercury ions are in the ultraviolet range. Parts and functions of fluorescent lamp C:UsersHPDesktopCLIFFORDless onsfluorescent lamp.pptx 14.
There are magnetic and electronic ballasts. Failure of the integral electronic ballast of a compact fluorescent bulb will also end its usable life.
A quick-start ballast eliminates the need for a starter switch, a common source of lamp failures. Mixing tube types within fittings can improve the color reproduction of lower quality tubes. The fill gas effectively increases the distance that electrons travel through the tube, which allows an electron a greater chance of interacting with a mercury atom.
The auto-transformer is either combined with the ballast or may be a separate unit. CFLs are fluorescent lights shaped to look like incandescent bulbs. Yes, fluorescent lamps may be powered by DC but they need a DC lamp controller instead of an AC ballast and starter. Overdriving a fluorescent lamp is a method of getting more light from each tube than is obtained under rated conditions. The electrodes are hidden in CFLs because they are in the screw-type base. This effect is due to loose cathode material and usually disappears after a few hours of operation.
The arc within the lamp may generate radio frequency noise, which can be conducted through power wiring.
Of particular importance was the mercury vapor lamp invented by Küch and Retschinsky in The next step in gas-based lighting took advantage of the luminescent qualities of The development of the neon light also was significant for the last key element of the fluorescent lamp, its fluorescent coating.All the major features of fluorescent lighting were in place at the end of the 1920s. The organic solvents are allowed to evaporate, then the tube is heated to nearly the melting point of glass to drive off remaining organic compounds and fuse the coating to the lamp tube. Mercury vapor lamps also anticipated the fluorescent lamp in their incorporation of a ballast to maintain a constant current.