These electrons move so quickly that they heat the air around them causing it to glow. Prior art keywords container electrodes appendage discharge lamp electric discharge prior art date 19350829 legal status the legal status is an assumption and is not a legal conclusion. Utilization of electrical energy pdf notes uee pdf notes. Each hid lamp type has its own characteristics that must be individually considered for any lighting application. This book brings together an extraordinary amount of data on all the major types of electric discharge lamps which are now in commercial use. Lamp, a device for producing illumination, consisting originally of a vessel containing a wick soaked in combustible material, and subsequently such other lightproducing instruments as gas and electric lamps. At the tenth annual conference at margate of the association of public lighting engineers, a paper was read on september 5 by mr. The lamp tube, coated on the inside with fluorescent phosphors, contains a mixture of a rare gas and. Hid high intensity discharge lamps elliott electric supply. Electric discharge machining is a method of machining in which, as shown in figure 1, when an electrode and a workpiece are brought closer to each other with pulse voltage being applied between them, dielectric breakdown occurring at a certain distance between them triggers discharge, whose high temperature and pressure in turn cause part of the workpiece to be melted and blown. Wilson on electric discharge lamps and their applications to. Provide a basic design for a discharge lamp and explain the function of the different components.
Describes a system for the designation of highintensity discharge lamps, including compact, enclosedarc discharge light sources such as mercury, metal halide. Expired lifetime application number us192231a inventor jr walter f powell. Electric discharge an overview sciencedirect topics. If some gas at low pressure is contained in a tube fitted with metal electrodes at each end the gas glows with a characteristic colour when a high voltage is applied to the electrodes. Some include additional substances, like mercury, sodium, and metal halides, which are vaporized during startup to become part of the gas mixture. Highintensity discharge lamp a lamp that produces light by passing an electrical current through a gas or vapor under high pressure. View and download lincoln electric mkt 2015 owners manual onlineelectric. We see a burst of this light in the sparks of static electricity or lightning. Cost of the lamps the cost varies according to the technology chosen.
The lamp was invented at least as early as 70,000 bce. Typically, such lamps use a noble gas argon, neon, krypton, and xenon or a mixture of these gases. The light fittingdepends mainly on the application. Circuits exceeding 277 volts, nominal, to ground and not. 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.
Download uee unit pdf 4 utilization of electrical energy notes pdf uee notes pdf unit v various illumination methods. Different type of lamps for luminous electrical notes. Generally, lamps with high lighting efficiency and longlife lamps are expensive and conversely. 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 electric field set up inside the tube causes ions present in the gas to move with high speeds. A low steady current can be used to illustrate the spectrum of gases in a gasfilled tube. Uses for discharge lamps offgrid solar power by sepco. Dielectric barrier dischargegasdischarge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a plasma. Ul 48 standard for electric signs standards catalog.
Choose to either upload the image file directly, or copy and paste a link url that points directly to the image. Electric discharge lamp article about electric discharge. Us455069a us455069da us455069a us 455069 a us455069 a us 455069a us 455069d a us455069d a us 455069da us 455069 a us455069 a us 455069a authority us united states prior art keywords globe current lamp wires refractory prior art date 18910630 legal status the legal status is an assumption and is not a legal conclusion. Electric discharge lamps share a number of common features, such as those associated with a radiating body of gas and certain properties of plasmas. Photometry and colorimetry of fluorescent and other electric discharge lamps g. Suitable for control of motors, electric discharge lamps, tungsten filament lamps and electric heating equipment where the sum of motor fullload ampere ratings and the ampere ratings of other loads do not exceed the ampere rating of the switch and the tungsten load does not exceed 30 percent of. 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. Comparison between discharge and led lighting fixtures. Waymouth remarks that well over half the total amount of light produced in this country, and perhaps the world, is produced by electric discharge lamps. Photometry and colorimetry of fluorescent and other. Electricdischarge lamp definition of electricdischarge. Its scope has been limited, however, to a few resources which together.
Ew series lighting fixtures are used to illuminate indoor or outdoor settings, either if diffuse or ambient light is required. Electric lamps and their auxiliaries etd 23 designator of legally binding document. Do not use where directly exposed to water or outdoors without an enclosed fixture. This radiation is discrete, as opposed to the continuous radiation emitted by an incandescent filament. For consultation, design and interpretation of components, devices and electrical circuit diagrams and electronic keywords. An ordinary household fluorescent lamp is an example of an electricdischarge source. Cost of the light fittings the light fitting depends mainly on the application. Below you can add an image for hid high intensity discharge lamps that will appear in the manufacture search results on our website. This site is like a library, use search box in the widget to get ebook that you want. Electric discharge tubes or discharge lamps sparkgaps. Lamps led discharge induction fluorescent lamps hid lamps linear compact fluorescent low pressure sodium mercury high pressure.
Expired lifetime application number us104312a inventor pirani marcello rompe. Light is produced by an arc discharge between two electrodes at opposite ends of the arc tube within the lamp. Lightning is caused by an electrical discharge of electrons moving very quickly from one place to another. Discharge lamp definition of discharge lamp by merriam. Several types of lamps produce light by establishing a permanent electric arc in a gas. This process is known as electric discharge, or gaseous discharge. Nec 2017 code changes chapter 2 wiring and protection. Its scope has been limited, however, to a few sources which together. See how the characteristic spectra of different elements are produced, and configure your own elements energy states to produce light of different colors.
Discharge lamp ballast with resonant starting general. Hid lamps have a long life and consume little energy to produce a great amount of light. Details of electric discharge tubes or discharge lamps, including details applicable to both discharge devices and incandescent lamps. Gas discharge lamps emit light when electric light is passed through the gas. Discharge lamps generate electromagnetic radiation by means of an electric current passing through a gas or metal vapor. Discharge lamps physics homework help, physics assignments. Us2103041a us97278a us9727836a us2103041a us 2103041 a us2103041 a us 2103041a us 97278 a us97278 a us 97278a us 9727836 a us9727836 a us 9727836a us 2103041 a us2103041 a us 2103041a authority us united states prior art keywords container electrodes appendage discharge lamp electric discharge prior art date 19350829 legal status the legal status is an assumption and is not. A neon lamp is an example of a gasdischarge lamp, useful both for illumination and as a voltage regulator. Although the first discharge lamps were carbon arc lamps used briefly for street lighting near the turn of the century, it was not until the 1940s that discharge lamps in the form of fluorescent lamps came into common usage.
Click download or read online button to get electric discharge lamps book now. The discharge was obtained by combining two metal or graphite rods in atmospheric air. In a high pressure electric discharge lamp employing at least one ribbon seal incorporating a strip 3 of refractory metal foil extending through the wall of an envelope 1 of fused silica, and connected at its outer end to at least one external lead rod 5 and at its inner end to a rod 4 which constitutes or provides a support for an electrode of the lamp, with the foil and adjacent ends. Types of highintensity discharge lamps mercury vapor lamps mercury vapor lamps are widely used to light both indoor and outdoor areas such as gymnasiums, factories, department stores, banks, highways, parks, and sports fields. Electric discharge lamps are characterized by a high impedance prior to starting. An estimated two billion electric discharge lamps are currently in existence worldwidel. Light sources incandescent lamp discharge lamp florescent lamp sodium lamp high pressure mercury vapour lamp 3. This type of lamp involves an internal electrical discharge being created between two electrodes in a gas filled chamber. Other criteria can be used to narrow down the choice. Upon application of a relatively high starting voltage, the lamp terminal voltage decreases and the operating current increases in a negative resistance fashion.
The properties and effects of electric discharges are useful over a wide range of magnitudes. 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. Discussion of phenomena in connection with one of them can also apply to others, which enables the author to emphasize unique aspects of. What are some of the main uses for discharge lamps. Electric discharge lamps download ebook pdf, epub, tuebl. Discharge lamps, mv and sv lamps comparison between tungsten filament lamps and fluorescent tubes, basic principles of light control, types and design of lighting and flood lighting. Electric discharge denotes the excitation of atomic states in a gaseous medium on passing an electric current through the medium. Electric discharge and fluorescence light is often produced when an electric current passes through a gas.
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