In contrast with all other electrical lamps that use electrical connections through the lamp envelope to transfer power to the lamp, in electrodeless lamps the power needed to generate light is transferred from the outside of the lamp envelope by means of (electro)magnetic fields. There are two advantages of eliminating electrodes. The first is extended bulb life, because the electrodes are usually the limiting factor in bulb life. The second benefit is the ability to use light-generating substances that would react with metal electrodes in normal lamps. The electromagnetic field is a physical field that is produced by electrically charged objects and which affects the behaviour of charged objects in the vicinity of the field. ...

Two systems are described below—one based on conventional fluorescent lamp phosphors, and a second based on the use of direct-radiating sulfur vapor. Fluorescent lamps in Shinbashi, Tokyo, Japan Assorted types of fluorescent lamps. ... Green screen A phosphor is a substance that exhibits the phenomenon of phosphorescence (sustained glowing after exposure to light or energised particles such as electrons). ... General Name, Symbol, Number sulfur, S, 16 Chemical series nonmetals Group, Period, Block 16, 3, p Appearance lemon yellow Standard atomic weight 32. ... Vapor (US English) or vapour (British English) is the gaseous state of matter. ...

History

Nikola Tesla demonstrated wired and wireless transfer of power to electrodeless fluorescent and incandescent lamps in his lectures and articles in the 1890's, and subsequently patented a system of light and power distribution on those principles. In the lecture before the AIEE, May 20, 1891, titled Experiments with Alternating Currents of Very High Frequency and Their Application to Methods of Artificial Illumination and US patent 454622, among many other references in the technical and popular press are found countless records for Dr. Tesla's priority in this field. A suit filed by Dr. Tesla against J.J. Thompson for priority on the patent was subsequently granted in Dr. Tesla's favor. The transcripts of the case languish currently in archives, awaiting processing, and eventual publishing. Noting the diagrams in Tesla's lectures and patents, a striking similarity of construction to electrodeless lamps that are available on the market currently is readily apparent. Further, a statement in 1929 by Dr. Tesla, published in The World : Nikola Tesla (1856-1943)[1] was a world-renowned Serbian inventor, physicist, mechanical engineer and electrical engineer. ... The American Institute of Electrical Engineers was a United States based organization of electrical engineers that existed between 1884 and 1963 (when it merged with the Institute of Radio Engineers (IRE)). The 1884 founders of the American Institute of Electrical Engineers (AIEE) included some of the most prominent inventors and... ... For other uses of the specific phrase The World, see The World (disambiguation). ...

"Surely, my system is more important than the incandescent lamp, which is but one of the known electric illuminating devices and admittedly not the best. Although greatly improved through chemical and metallurgical advances and skill of artisans it is still inefficient, and the glaring filament emits hurtful rays responsible for millions of bald heads and spoiled eyes. In my opinion, it will soon be superseded by the electrodeless vacuum tube which I brought out thirty-eight years ago, a lamp much more economical and yielding a light of indescribable beauty and softness."

In 1967 and 1968, John Anderson General Electric 2, 3 applied for patents for electrodeless lamps. Philips introduced their QL induction lighting systems, operating at 2.65 MHz, in 1990 in Europe and in 1992 in the US. Matsushita had induction light systems available in 1992. Intersource Technologies also announced one in 1992, called the E-lamp. Operating at 13.6 MHz, it was to be available on the US market in 1993 but as of July 2005 very few of these lamps have been manufactured. “GE” redirects here. ... Philips HQ in Amsterdam Koninklijke Philips Electronics N.V. (Royal Philips Electronics N.V.), usually known as Philips, (Euronext: PHIA, NYSE: PHG) is one of the largest electronics companies in the world, founded and headquartered in the Netherlands. ... Logo for the Panasonic brand Matsushita Electric Industrial Co. ...

Since 1994, General Electric has produced its induction lamp Genura with an integrated ballast, operating at 2.65 MHz. In 1996, Osram started selling their Endura induction light system, operating at 250 kHz. It is available in the US as Sylvania Icetron. “GE” redirects here. ... This article or section does not cite its references or sources. ...

In 2006, AMKO SOLARA in Taiwan has introduced and started selling their induction lamp SOLARA with a dimmable ballast and up to 400 watts of output. Their products operate at both 2.65 MHz and 250 kHz.

In 1990, Michael Ury, Charles Wood and colleagues, formulated the concept of the sulphur lamp. With support from the United States Department of Energy, it was further developed in 1994 by Fusion Lighting of Rockville, Maryland, a spinoff of the Fusion UV division of Fusion Systems Corporation. Its origins are in microwave discharge light sources used for ultraviolet curing in the semiconductor and printing industries. Sulfur lamp bulb at startup The sulfur lamp (also sulphur lamp) is a highly efficient full-spectrum electrodeless lighting system whose light is generated by sulfur plasma that has been excited by microwave radiation. ... The United States Department of Energy (DOE) is a Cabinet-level department of the United States government responsible for energy policy and nuclear safety. ...

Around 2001, Frederick Espiau, Chandrashekhar Joshi and Yian Chang invented a system that concentrates radio frequency in a solid dielectric waveguide thereby energizing a light emitting plasma (physics) in a bulb positioned inside. This invention was further developed by LUXIM and introduced in 2006 as a projector lamp product trade-named LIFI. It has been suggested that this article or section be merged with Radio waves. ... A dielectric, or electrical insulator, is a substance that is highly resistant to electric current. ... Look up waveguide in Wiktionary, the free dictionary. ... A plasma lamp, illustrating some of the more complex phenomena of a plasma, including filamentation. ...

Fluorescent induction lamps

A Philips QL induction lighting system, where A) Discharge vessel, B) Tube with power coupler and C) Electronic ballast.

Aside from the method of coupling energy into the mercury vapor, these lamps are very similar to conventional fluorescent lamps. Mercury vapor in the discharge vessel is electrically excited to produce short-wave ultraviolet light, which then excites the phosphors to produce visible light. While still relatively unknown to the public, these lamps have been available since 1990. The most common form has the shape of an incandescent light bulb. Unlike an incandescent lamp or conventional fluorescent lamps, there is no electrical connection going inside the glass bulb; the energy is transferred through the glass envelope solely by electromagnetic induction. Image File history File links Electrodeless Philips QL induction lampsystem. ... Image File history File links Electrodeless Philips QL induction lampsystem. ... In electronics and telecommunication, coupling is the desirable or undesirable transfer of energy from one medium, such as a metallic wire or an optical fiber, to another medium, including fortuitous transfer. ... General Name, Symbol, Number mercury, Hg, 80 Chemical series transition metals Group, Period, Block 12, 6, d Appearance silvery Standard atomic weight 200. ... Fluorescent lamps in Shinbashi, Tokyo, Japan Assorted types of fluorescent lamps. ... “UV” redirects here. ... Green screen A phosphor is a substance that exhibits the phenomenon of phosphorescence (sustained glowing after exposure to light or energised particles such as electrons). ... “Light bulb” redirects here. ... An electrical connection between discrete points allows the flow of electrons, (current). ... For magnetic induction, see Magnetic field. ...

In the most common form, a glass tube (B) protrudes bulb-wards from the bottom of the discharge vessel (A). This tube contains an antenna called a power coupler, which consists of a coil wound over tubular ferrite core. A Yagi-Uda beam antenna Short Wave Curtain Antenna (Moosbrunn, Austria) A building rooftop supporting numerous dish and sectored mobile telecommunications antennas (Doncaster, Victoria, Australia) An antenna is a transducer designed to transmit or receive radio waves which are a class of electromagnetic waves. ... A coil is a series of loops. ... Ferrite may refer to: Ferrite (magnet)s (e. ... A magnetic core is the core of an electromagnet or inductor. ...

In lower-frequency versions of induction systems, the lamp consists of two long parallel glass tubes, connected by two short tubes that have coils mounted around them. Parallel is a term in geometry and in everyday life that refers to a property in Euclidean space of two or more lines or planes, or a combination of these. ...

The antenna coils receive electric power from the electronic ballast (C) that generates a high frequency. The exact frequency varies with lamp design, but popular examples include 13.6 MHz, 2.65 MHz and 250 kHz (in physically large lamps). A special resonant circuit in the ballast produces an initial high voltage on the coil to start a gas discharge; thereafter the voltage is reduced to normal running level. It has been suggested that this article or section be merged into electricity. ... A ballast is a device used to start a gas discharge lamp, and, once the lamp is started, to limit the flow of electric current. ... FreQuency is a music video game developed by Harmonix and published by SCEI. It was released in November 2001. ... MHZ redirects here. ... This article is about resonance in physics. ...

The system can be seen as a type of transformer, with the power coupler forming the primary coil and the gas discharge arc in the bulb forming the one-turn secondary coil and the load of the transformer. The ballast is connected to mains electricity, and is generally designed to operate on voltages between 100 and 277 VAC at a frequency of 50 or 60 Hz. Most ballasts can also be connected to DC voltage sources like batteries for emergency lighting purposes. System (from Latin systēma, in turn from Greek systēma) is a set of entities, real or abstract, comprising a whole where each component interacts with or is related to at least one other component and they all serve a common objective. ... Figure 1:Three-phase pole-mounted step-down transformer. ... -1... Electricity arcs between the power rail and electrical pickup shoe on a London Underground train An electric arc is an electrical breakdown of a gas which produces an ongoing plasma discharge, similar to the instant spark, resulting from a current flowing through normally nonconductive media such as air. ... Turning is the action of not going straight. ... Load may mean: Look up Load in Wiktionary, the free dictionary. ... Type F mains power plug & socket The term mains usually refers to the general purpose alternating current (AC) electrical power supply (as in “Ive connected the appliance to the mains”). The term is not usually used in the United States and Canada. ... Direct current (DC or continuous current) is the continuous flow of electricity through a conductor such as a wire from high to low potential. ... A valve-regulated, sometimes called sealed, lead acid battery Lead-acid batteries, invented in 1859 by French physicist Gaston Planté, are the oldest type of rechargeable battery. ...

In other conventional gas discharge lamps, the electrodes are the part with the shortest life, limiting the lamp lifespan severely. Since an induction lamp has no electrodes, it can have a very long service life. For induction lamp systems with a separate ballast, the service life can be as long as 100,000 hours, which is 11.4 years continuous operation, or 22.8 years used at night or day only. For induction lamps with integrated ballast, the life is 15,000 to 30,000 hours. Extremely high-quality electronic circuits are needed for the ballast to attain such a long service life. Such expensive lamps have special application areas in situations where replacement costs are high. An electrode is an electrical conductor used to make contact with a metallic part of a circuit (e. ... For the Talib Kweli album Quality (album) Quality can refer to a. ... An electronic circuit is an electrical circuit that also contains active electronic devices such as transistors or vacuum tubes. ... Service life refers to the expected lifetime of a product. ...

Research on electrodeless lamps continues, with variations in operating frequency, lamp shape, the induction coils and other design parameters. Low public awareness and relatively high prices have so far kept the use of such lamps highly specialized.

Direct-radiating sulfur lamps

Main article: Sulfur lamp

LBNL researcher examines prototype sulfur lamp. ...

See also

• List of light sources

A Standard Household Light bulb This page is a list of sources of light. ...

External links

• "Experiments with Alternate Currents of Very High Frequency and Their Application to Methods of Artificial Illumination," AIEE, Columbia College, N.Y., May 20, 1891

• Induction lamps

• Radio frequency lamps overview

Lighting and Lamps v • d • e
Incandescent:	Conventional - Halogen - Parabolic aluminized reflector (PAR)
Fluorescent:	Compact fluorescent (CFL) - Linear fluorescent - Induction lamp
Gas discharge:	High-intensity discharge (HID) - Mercury-vapor - Metal-halide - Neon - Sodium vapor
Electric arc:	Arc lamp - HMI - Xenon arc - Yablochkov candle
Combustion:	Acetylene/Carbide - Candle - Gas lighting - Kerosene lamp - Limelight - Oil lamp - Safety lamp - Petromax - Rushlight
Other types:	Sulfur lamp - Light-emitting diode (LED) - LED lamp (SSL) - Plasma - Electroluminescent wire - Chemiluminescence - Deuterium arc lamp - Radioluminescence
Items used to manipulate resultant light:	Mirrors - Prism - Optical fiber - Lens