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fluorescent lamp

Dictionary: fluorescent lamp Sponsored Links Compact Fluorescent Lamp we are mainly making 2u, 3u, 4u, l- otus global gu10 energy saving lamp www.zjmys.com fluorescent tubes Manufactory of lighting product we have a lot of lighting Fixtures www.txlx.com Home > Library > Literature & Language > Dictionary n. A lamp that produces visible light by fluorescence, especially a glass tube whose inner wall is coated with a material that fluoresces when an electrical current causes a vapor within the tube to discharge electrons. (Click to enlarge) fluorescent lamp(Precision Graphics)

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fluorescent lampTop Britannica Concise Encyclopedia:

fluorescent lampTop Home > Library > Miscellaneous > Britannica Concise Encyclopedia Type of electric discharge lamp consisting of a glass tube filled with a mixture of argon and mercury vapor. A current of electricity causes the vapor to produce ultraviolet radiation that, in turn, excites a phosphor coating on the inside of the tube, causing it to fluoresce, or reradiate the energy as visible light. Fluorescent lamps are cooler and more efficient than incandescent lamps. They are commonly installed with diffusers as part of a suspended ceiling system. See also fluorescence. For more information on fluorescent lamp, visit Britannica.com. Sponsored Links Photo Studio Lights 220V ALZO continuous cool studio lights in 220V with CFL light bulbs AlzoDigital.com energy saving systems prevention from myopia eyes care learning, energy saving, Order now

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Fluorescent lampTop Home > Library > Science > Sci-Tech Encyclopedia A lamp that produces light largely by conversion of ultraviolet energy from a lowpressure mercury arc to visible light. Phosphors, chemicals that absorb radiant energy of a given wavelength and reradiate at longer wavelengths, produce most of the light provided by fluorescent lamps. See also Phosphorescence. The lamp consists of a glass tube containing two electrodes, a coating of activated powdered phosphor, and small amounts of mercury. The glass tube seals the inner parts from the atmosphere. The electrodes provide a source of free electrons to initiate the arc, and are connected to the external circuit through the ends of the lamp. The phosphor converts short-wave ultraviolet energy into visible light. The mercury, when vaporized in the arc, produces the ultraviolet radiation that causes fluorescence. An inert gas, such as argon, krypton, or neon, introduced in small quantities provides the ions that facilitate starting of the lamp (see illustration). See also Fluorescence.

Parts of a typical fluorescent lamp. Fluorescent lamps are usually operated on ac circuits with a frequency of 60 Hz. However, higher frequencies permit higher-efficacy lamp operation along with ballasts of lower power dissipation per watt. Consequently, systems have been developed for the operation of fluorescent lamps at frequencies from 360 to 50,000 Hz. The most important high-frequency ballasts operate the lamps in the 25-kHz range, are lighter in weight, can have flicker-free light output, and will continue to be more cost-effective as the cost of electricity increases. Electronic technology permits these ballasts to be made with more features, such as dimming and low-cost remote controls, enhancing their overall performance value. Fluorescent lamps provide light at several times the efficacy of incandescent lamps, the exact ratio depending on the fluorescent lamp color. Lamp color is determined by the selection of chemicals used in the phosphors; various chemicals respond to the ultraviolet energy in the arc by producing different colors of light. Several types of essentially white fluorescent lamps are available commercially, as well as a range of tinted and saturated colors.

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fluorescent lampTop Home > Library > Home & Garden > Architecture and Construction A low-pressure electric-discharge lamp; ultraviolet-light radiation is generated by the passage of an arc through mercury vapor; the inner surface of the lamp tube is coated with a phosphor which absorbs the ultraviolet and converts some of it into visible light.

fluorescent lamp

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Fluorescent lamps

Assorted types of fluorescent lamps. Top, two compact fluorescent lamps. Bottom, two regular tubes. Left, matchstick shown for scale.

Typical F71T12 100 W bi-pin lamp used in tanning beds. Note the (Hg) symbol indicating it contains mercury. In the US this symbol is now required on all fluorescent bulbs that contain mercury.

Inside the lamp end of a bi-pin lamp A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapor. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp. Lower energy cost typically offsets the higher initial cost of the lamp. The lamp is more costly because it requires a ballast to regulate the current through the lamp. While larger fluorescent lamps have been mostly used in commercial or institutional buildings, the compact fluorescent lamp is now available in the same popular sizes as incandescents and is used as an energy-saving alternative in homes. Contents [hide]

1 History o 1.1 Physical discoveries o 1.2 Early discharge lamps o 1.3 Neon lamps o 1.4 Commercialization of fluorescent lamps 2 Principles of operation o 2.1 Construction o 2.2 Electrical aspects of operation o 2.3 Effect of temperature o 2.4 Losses o 2.5 Cold cathode lamps o 2.6 Starting 2.6.1 Switchstart/preheat 2.6.2 Instant start 2.6.3 Rapid start 2.6.4 Quick-start 2.6.5 Semi-resonant start 2.6.6 Electronic ballasts o 2.7 End of life 2.7.1 Emission mix

2.7.2 Burned filaments 2.7.3 Ballast electronics 2.7.4 Phosphor 2.7.5 Loss of mercury 3 Phosphors and the spectrum of emitted light o 3.1 Color temperature o 3.2 Color rendering index o 3.3 Phosphor composition 4 Applications 5 Advantages o 5.1 Luminous efficacy o 5.2 Life o 5.3 Lower luminosity o 5.4 Lower heat 6 Disadvantages o 6.1 Frequent switching o 6.2 Health and safety issues o 6.3 Ultraviolet emission o 6.4 Ballast o 6.5 Power quality and radio interference o 6.6 Operating temperature o 6.7 Lamp shape o 6.8 Flicker problems o 6.9 Dimming o 6.10 Disposal and recycling 7 Lamp sizes and designations 8 Other fluorescent lamps 9 Science demonstrations 10 See also 11 References

12 External links

HistoryThis article needs additional citations for verification.Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (March 2010)

Physical discoveriesFluorescence of certain rocks and other substances had been observed for hundreds of years before its nature was understood. By the middle of the 19th century, experimenters had observed a radiant glow emanating from partially evacuated glass vessels through which an electrical current passed. One of the first to explain it about 1845 was the

British (Irish) scientist Sir George G. Stokes from Cambridge University, who named the phenomenon fluorescence after fluorite, a mineral many of whose samples fluoresce strongly due to impurities. The explanation relied on the nature of electricity and light phenomena as developed by the British scientists Michael Faraday and James Clerk Maxwell in the 1840s.[1] Little more was done with this phenomenon until 1856 when a German glassblower named Heinrich Geissler created a mercury vacuum pump that evacuated a glass tube to an extent not previously possible. When an electrical current passed through a Geissler tube, a strong green glow on the walls of the tube at the cathode end could be observed. Because it produced some beautiful light effects, the Geissler tube was a popular source of amusement. More important, however, was its contribution to scientific research. One of the first scientists to experiment with a Geissler tube was Julius Plcker who systematically described in 1858 the luminescent effects that occu