Gas discharge lamps are a family of artificial light sources that generate light by sending an electrical discharge through an ionized gas, a plasma. This type of lamp involves an internal electrical discharge being created between two electrodes in a gas filled chamber. An electric current in the gas energizes mercury vapor which delivers ultraviolet radiation through discharge process and the ultraviolet radiation causes the phosphor coating of the lamp inner wall to radiate visible light. An arc lamp and a gas discharge lamp are not the same thing and these articles should not be merged. At this point, the gas in the gdt becomes fully ionized and conduction takes place. Where to buy gas discharge lamps, manufacturers and suppliers. Types and characteristics of discharge lamps historically, discharge lamps represented, in the nineteenth century, the first forms of electric lighting, even before the invention of the incandescent lamps. Mercury shortarc discharge lamp intense point light source that provides a broad spectrum through the visible and ultraviolet range. The light is created by striking an arc between the two electrodes. Pdf modeling dynamic high intensity discharge lamp characteristics. Jan 28, 2014 this little gas discharge lamp was inside a larger light bulb found in street lights here in europe. These lamps produce light by sending electricity through an ionized gas. The french astronomer jean picard observed 1675 a faint glow in a mercurybarometer tube when it was agitated, but the cause of the glow static electricity was not then understood. Harmonic distortions of the ac waveform for a hg hid lamp.
Encyclopedia article about gasdischarge lamp by the free dictionary. The ionization degree may vary anywhere from 100% to 10 4 10 6 i. While it warms up, the lamp exhibits different colors as the various metal halides vaporize in the arc chamber. Combining good lamp, ballast and luminaire in a wrong installation may not. Symmetrical hot restrike asymmetric hot restrike high frequency power supply all these devices obviously need special attention during implant system. Fluorescent lamp and working principle of fluorescent lamp. What are some of the main uses for discharge lamps. Sodium gas discharge lamp on high voltage mot youtube. They need a starting voltage to get the arc going and then pulls some amps i guess. The broad spectrum makes the osram hbo 103w2 ideal for microscopy and fluorescent microscopy applications.
S0963025200155926 introduction to gas discharges n st j braithwaite the open university, oxford research unit, foxcombe hall, boars hill, oxford ox1 5hr, uk received 1 december 1999, in. Gas discharge lamps fluorescent tubes, metal halide, sodium etc lamp disposal and recycling. Company details wood auto supplies ltd cromwell works colne road huddersfield hd1 3es united kingdom tel. Low pressure sodium lamps, the most efficient gas discharge lamp type, producing up to 200 lumens per watt, but at the expense of very poor color rendering.
For example, a 400watt high pressure sodium lamp produces 50,000 initial lumens. Similar to fluorescent lamps, hid lamps require a ballast to start and maintain. Information and translations of gasdischarge lamp in the most comprehensive dictionary definitions resource on the web. This little gas discharge lamp was inside a larger light bulb found in street lights here in europe. Return to updates gas discharge lamps a better theory by miles mathis first published august 5, 2015 this paper is one of the fruits of my third conference, which happened a couple of weeks ago. Most lamps are filled with additional materials, like mercury, sodium, andor metal halides. For this reason, it was originally associated with the discharge of a capacitor. Gasdischarge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a plasma. Gasdischarge light source article about gasdischarge light source by the free dictionary. Sams and dons dlamp faq gas discharge lamps, ballasts, and. The discharge bulb filled with a mixture of xenon gas and metalhalide salts.
Gasdischarge lamp definition of gasdischarge lamp by. Transport processes in metal halide gas discharge lamps w. Comparison between discharge and led lighting fixtures. Depending on several factors, the discharge may radiate visible light. A mercury vapor lamp is a gas discharge lamp that produces. A gas discharge lamp consists of a transparent gas discharge enclosure containing a small quantity of gas or vapour at a low pressure and two electrodes provided for connecting the lamp to the supply mains. It is characterized by the generation of ions in the gas by an applied electric. Marco miebach presentation incoherent light sources.
A gasfilled tube, also known as a discharge tube, is an arrangement of electrodes in a gas within an insulating, temperatureresistant envelope. Two seemingly unrelated questions came up, neither of which i had worked on before. High intensity discharge lighting technology workshop report november 15, 2005 washington, dc prepared for. The french astronomer jean picard observed 1675 a faint glow in a mercurybarometer tube when it was agitated, but the cause of the glow. Provide a basic design for a discharge lamp and explain the function of the different components. Publishers pdf, also known as version of record includes final page, issue and. Electronic pdf copies of this report are available to the public from. The character of the gas discharge critically depends on the frequency or modulation of the current. The lamp requires an electronic starter for quick ignition and electronic ballast for functioning. The fluorescent lamp is probably the best known gas discharge lamp. Gasfilled tubes exploit phenomena related to electric discharge in gases, and operate by ionizing the gas with an applied voltage sufficient to cause electrical conduction by the underlying phenomena of the townsend discharge. Gasdischarge light source article about gasdischarge. The same wattage metal halide lamp produces 40,000 initial lumens, and the 400watt mercury vapor lamp produces only 21,000 initially. Typically, such lamps use a noble gas argon, neon, krypton and xenon or a mixture of these gases.
Compared to incandescent lamps, gas discharge lamps offer higher efficiency, but are more complicated to manufacture and require auxiliary electronic equipment such as ballasts to control current flow through the gas. Low pressure sodium lamps also have long life span. Return to updates gas discharge lamps miles mathis. Gas discharge lamps fluorescent tubes, metal halide, sodium etclamp disposal and recycling. Table 1 characteristic lamp data of low and high pressure discharge lamps low pressure high pressure mercury pressure 106 10 5 bar 1100 bar electrode temperature 1500 k 20003000 k lamp wattage 5150 w 302000 w lamp current 0. The uk is adopting the ewcs european waste catalogue which will classify fluorescent lamps as hazardous waste. Discharge lamp definition of discharge lamp by merriam. Electric discharge in gases occurs when electric current flows through a gaseous medium due to ionization of the gas.
Series of streamers of liquid drop, obtained by gas discharge visualization. Most of these lamps use a noble gas, or a combination of noble gases, but they often contain other materials, such as mercury, sodium or metal halides. Typically, such lamps use a noble gas argon, neon, krypton, and xenon or a mixture of these gases. Some include additional substances, like mercury, sodium, and metal halides, which are vaporized during startup to become part of the gas mixture. See how the characteristic spectra of different elements are produced, and configure your own elements. Discharge lamp definition is an electric lamp in which an enclosed gas or vapor glows or causes a phosphor coating on the lamp s inner surface to glow. Osram hbo and hxp mercury short arc discharge lamps. Usually in every discharge lamp an inert gas or mixture of inert gases is added to the metal. The graph is only typical however in the sense that all tubes exhibit the conduction behaviour shown, but the corresponding voltages and currents, and the relative lengths of the various regions, are highly variable. Find out information about gasdischarge light source. Electronic operation and control of highintensity gas discharge lamps. Metalhalide and similar gasdischarge lamps are powered from lowvoltage dc.
Transport processes in metal halide gas discharge lamps. The fluorescent lamp is perhaps the best known gas discharge lamp. See how the characteristic spectra of different elements are produced, and configure your own elements energy states to produce light of different colors. On the downside the light is consid ered to be of low quality, yet still su cient for large scale lighting where e ciency is more important than quality such as street lighting. Fluorescent lamps are a special class of gas discharge lamps where the electric current produces mostly invisible uv light which is turned into. A gas filled tube, also known as a discharge tube, is an arrangement of electrodes in a gas within an insulating, temperatureresistant envelope. Both manufacturers and distributors can be registered. Gas discharge lamps have a high light output per watt and have a long live expectancy.
Box 80020, 5600jm, eindhoven, the netherlands abstract. Discharge lamps 10 neon discharge lamps neon lamp metal electrodes inject free charges into dilute neon plasma formsa vapor of charged particles electric field causes current to flow in the plasma current is mostly electrons streaming toward positive electrons often collide violently with neon atoms discharge lamps 11. Gas discharge lamp manufacturer, mercury lamp manufacturer. Plasmas are cathegorized in hightemperature or fusion plasmas and lowtemperature plasmas or gas discharges. Gas discharge lamp simple english wikipedia, the free. A gas discharge lamp is a light source that generates light by creating an electrical discharge through an ionized gas.
In this case a sodiumvapor lamp or a mercuryvapor lamp is used. Gas discharge lamps are a family of artificial light sources or lamps. Gasdischarge lamps are a family of artificial light sources that generate light by sending an electrical discharge through an ionized gas. An overview is given of transport reactions and corrosion phenomena in metal halide gas discharge lamps filled with a mixture of alkali halides with scandium or rareearth iodides.
A fluorescent lamp is a low weight mercury vapour lamp that uses fluorescence to deliver visible light. Discharge lamp definition is an electric lamp in which an enclosed gas or vapor glows or causes a phosphor coating on the lamps inner surface to glow. From january 1 st 2014 lamps fall into category of the weee directive, which is includes all types of lamps, from gas discharge lamps to led light sources. High intensity discharge lighting technology notice energy.
The properties of electric discharges in gases are studied in connection with design of lighting sources and in the design of high voltage electrical equipment. Office of energy efficiency and renewable energy u. These systems, called hot restrike, are of various types. The broad spectrum makes these lamps ideal for microscopy and. The efficacy of the hps lamp is very high as much as 140 lumens per watt. Energy conservation standards for fluorescent lamp ballasts pdf. Where to buy gas discharge lamps, manufacturers and. Gas filled tubes exploit phenomena related to electric discharge in gases, and operate by ionizing the gas with an applied voltage sufficient to cause electrical conduction by the underlying phenomena of the townsend discharge. Gas discharge lamp basics the use of electrically excited gas discharges significantly predates the invention of the incandescent lamp. Gasdischarge lamp article about gasdischarge lamp by the. Sodium vapor lamps are commonplace as streetlights. Some gas discharge lamps also have a perceivable startup. Specifically, how the technology of discharge lamps is connected to bohrs model of the atom and line spectra. There are many different types of lamps that operate under this principle.
A fluorescent lamp, or fluorescent tube, is a lowpressure mercuryvapor gas discharge lamp. Gasdischarge lamp article about gasdischarge lamp by. The voltage required to light a run of neon tube is variable according to diameter, gas type, pressure and number of tubes in circuit. These lamps produce light by sending electricity through a ionized gas. Gas discharge lamps have a long life and a high efficiency, but they are more complicated to manufacture, which makes them more expensive to buy than incandescent lamps. Discharge lamp definition of discharge lamp by merriamwebster.
Gas discharge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a plasma. It requires a twominute warmup for the mercury vapor to dominate the discharge, then 30 minutes for complete stabilization. Lumicom offer a range of containers for all your lamp needs. Electric discharge lamp, lighting device consisting of a transparent container within which a gas is energized by an applied voltage and thereby made to glow. How gas discharging lamps work cold cathode ccfl and hot. Physics labs of yesteryear as well as today have use of a variety of gas filled tubes used for numerous purposes involving light generation including spectroscopy, materials analysis, studies of gas dynamics. The 6035 spectral calibration lamp produces narrow, intense lines from the excitation of argon gas and mercury vapor. Electric discharge tubes or discharge lamps sparkgaps. Combining data such as those described above with a. When the electrodes establish a potential difference, the gas gets ionized. Gasdischarge lamps are a family of artificial light sources that generate light by sending an electrical discharge through an ionized gas, a plasma. High pressure discharge lamps, low pressure discharge lamps and highintensity discharge lamps. For a 15 kv transformer and neon gas you could run. At anylamp we help you find the right gas discharge lamp.
Pulsed power technology, in the simplest of terms, usually concerns the storage of electrical energy over relatively long times and then its rapid release over a comparatively short period. These lamps are optimal sources for fiber illumination devices for medical, scientific, and various industrial markets. The metal halide lamp requires a warmup period of as long as five minutes depending on the lamp type. A fluorescent lamp is a lowpressure gas discharge light source, in which light is. Plasma discharge euv light sources in which a gas is locally compressed to create a. We offer you gas discharge lamps at low prices with a fast delivery. Compared to incandescent lamps, gas discharge lamps offer higher efficiency, 1 2 but are more complicated to manufacture and most exhibit negative resistance, causing the resistance in the plasma to decrease as the current flow increases. The almost monochromatic yellow light is only acceptable for street lighting and similar applications. Neon orange hydrogen red helium yellow carbon dioxide white mercury blue neon glow lamp electronic indicator. Electric discharge lamp, also called vapour lamp, lighting device consisting of a transparent container within which a gas is energized by an applied voltage and thereby made to glow. The discharge was obtained by combining two metal or graphite rods in atmospheric air. Essentially a voltage dependent switch, the gdt maintains a high impedance offstate until a voltage exceeds the devices sparkover voltage. The special waste regulations on lamp disposal are being amended to class waste with a hazardous waste number as special waste.