The light fittingdepends mainly on the application. Choose to either upload the image file directly, or copy and paste a link url that points directly to the image. Several types of lamps produce light by establishing a permanent electric arc in a gas. For consultation, design and interpretation of components, devices and electrical circuit diagrams and electronic keywords. Other criteria can be used to narrow down the choice. 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. The behavior of electrons in mercury vapor under the influence of electric field is of vital interest in modeling of the gasdischarge lamps 1 23, lasers 4,5 and in special applications. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Electric discharge lamps download ebook pdf, epub, tuebl. Comparison between discharge and led lighting fixtures. My invention relates to gaseous electric discharge lamps generally and more particularly to such lamps having associated therewith a coating of fluorescent material which transforms ultrayiolet rays emitted by the discharge into. Photometry and colorimetry of fluorescent and other. 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. Wilson on electric discharge lamps and their applications to.
Generally, lamps with high lighting efficiency and longlife lamps are expensive and conversely. The lamp tube, coated on the inside with fluorescent phosphors, contains a mixture of a rare gas and. Discharge lamps generate electromagnetic radiation by means of an electric current passing through a gas or metal vapor. The discharge was obtained by combining two metal or graphite rods in atmospheric air. Its scope has been limited, however, to a few resources which together. Uses for discharge lamps offgrid solar power by sepco. 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 and fluorescence light is often produced when an electric current passes through a gas.
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. We see a burst of this light in the sparks of static electricity or lightning. This radiation is discrete, as opposed to the continuous radiation emitted by an incandescent filament. Hid lamps have a long life and consume little energy to produce a great amount of light. 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. 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. Gasdischarge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a plasma. An estimated two billion electric discharge lamps are currently in existence worldwidel. 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. Highintensity discharge lamp a lamp that produces light by passing an electrical current through a gas or vapor under high pressure. 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.
Do not use where directly exposed to water or outdoors without an enclosed fixture. 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. 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. Cost of the light fittings the light fitting depends mainly on the application. This site is like a library, use search box in the widget to get ebook that you want. The properties and effects of electric discharges are useful over a wide range of magnitudes. Provide a basic design for a discharge lamp and explain the function of the different components. Gas discharge lamps emit light when electric light is passed through the gas. 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.
Light sources incandescent lamp discharge lamp florescent lamp sodium lamp high pressure mercury vapour lamp 3. Discharge lamp definition of discharge lamp by merriam. This type of lamp involves an internal electrical discharge being created between two electrodes in a gas filled chamber. Ew series lighting fixtures are used to illuminate indoor or outdoor settings, either if diffuse or ambient light is required. Circuits exceeding 277 volts, nominal, to ground and not. This book brings together an extraordinary amount of data on all the major types of electric discharge lamps which are now in commercial use. Its scope has been limited, however, to a few sources which together. What are some of the main uses for discharge lamps. Electricdischarge lamps may be named after the filling gas or vapor that is responsible for the major portion of the radiation. Discharge lamp ballast with resonant starting general. Below you can add an image for hid high intensity discharge lamps that will appear in the manufacture search results on our website. Describes a system for the designation of highintensity discharge lamps, including compact, enclosedarc discharge light sources such as mercury, metal halide.
Nec 2017 code changes chapter 2 wiring and protection. 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. However, they distort the color rendition of objects and are used mostly as ambient lighting for commercial interiors. The lamp was invented at least as early as 70,000 bce. Electric lamps and their auxiliaries etd 23 designator of legally binding document. 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. 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. 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. Light is produced by an arc discharge between two electrodes at opposite ends of the arc tube within the lamp.
Cost of the lamps the cost varies according to the technology chosen. The electric field set up inside the tube causes ions present in the gas to move with high speeds. Discharge lamps physics homework help, physics assignments. Download uee unit pdf 4 utilization of electrical energy notes pdf uee notes pdf unit v various illumination methods. Typically, such lamps use a noble gas argon, neon, krypton, and xenon or a mixture of these gases. Lamps led discharge induction fluorescent lamps hid lamps linear compact fluorescent low pressure sodium mercury high pressure. A low steady current can be used to illustrate the spectrum of gases in a gasfilled tube. These electrons move so quickly that they heat the air around them causing it to glow. A neon lamp is made of a discharge tube filled with 95. An ordinary household fluorescent lamp is an example of an electricdischarge source.
Electric discharge tubes or discharge lamps sparkgaps. Electric discharge denotes the excitation of atomic states in a gaseous medium on passing an electric current through the medium. Expired lifetime application number us192231a inventor jr walter f powell. Utilization of electrical energy pdf notes uee pdf notes. 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. 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. A neon lamp is an example of a gasdischarge lamp, useful both for illumination and as a voltage regulator. 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. See how the characteristic spectra of different elements are produced, and configure your own elements energy states to produce light of different colors. This process is known as electric discharge, or gaseous discharge. Expired lifetime application number us104312a inventor pirani marcello rompe. Some include additional substances, like mercury, sodium, and metal halides, which are vaporized during startup to become part of the gas mixture. Electricdischarge lamp definition of electricdischarge.
Lightning is caused by an electrical discharge of electrons moving very quickly from one place to another. Different type of lamps for luminous electrical notes. Electric discharge lamp article about electric discharge. Click download or read online button to get electric discharge lamps book now.
At the tenth annual conference at margate of the association of public lighting engineers, a paper was read on september 5 by mr. Ul 48 standard for electric signs standards catalog. Hid high intensity discharge lamps elliott electric supply. Electric discharge an overview sciencedirect topics. Each hid lamp type has its own characteristics that must be individually considered for any lighting application. Details of electric discharge tubes or discharge lamps, including details applicable to both discharge devices and incandescent lamps.