A sodium vapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm. Dec 25, 20 sodium vapor lamps are very effective in fog while fluorescent lamps produce little glare. A wide variety of sodium vapor lamp options are available to you, such as bulb type, application, and certification. Excipients added in the formulation can also reduce the effect of light on a lightsensitive drug. Lowpressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor. This means its resistance decreases as the current through the tube increases.
Sodium vapor lamp definition, an electric lamp in which sodium vapor is activated by current passing between two electrodes, producing a yellow, glareless light. T0 provide a stronghot enough arc to light strike the lamp by overcoming the resistance of the gas in the lamp. Ce certificate 6,parameter of each wattage model bulb base lumens dimension lifespan cct cri finish hps70w t20 r7s 6000lm 20117mm 22000hrs 2100k 23 clear hps100w b54 e27. Some drugs are affected by light of a special wavelength that should be studied before developing the formulation and product should be protected from that light. Mar 10, 2020 high pressure sodium lamps or hps lamps march 10, 2020 february 24, 2012 by electrical4u highpressure sodium lamps also known as hps lamps or hps lights are a type of sodium lamp that is widely used in industrial lighting and many public outdoor areas. Local hot spots have no effect in increasing the sodium vapour pressure, because the metal will preferentially evaporate from those hotter regions and condense at the coldest spot. The lamp must be operated at horizontal or nearly horizontal position to keep the. Sodium vapor and mercury vapor lamps emit yellow and bright blue light, respectively. The sodium vapour lamp is only suitable for a alternating current, the, therefore, required chock control. A lowpressure sodiumvapor lamp is a tube of sodiumresistant glass filled with sodium vapor and a mixture of inert gases, with electrodes sealed into the ends of the tube. Construction, working and applications of following lamps. They are very efficient, and provide highintensity light suitable for illuminating large, open areas.
The gas in this case is sodium vapour, but several other gases may be such as mercury, ne. These lamps are highly demanded among our clients due to their superlative features such as greater illumination, high efficiency and weather resistance. View on sodium vapour lamp ppts online, safely and virusfree. In recent years, increasing competition from other discharge lamps is resulting in a slow decline in its market, but it continues to be specified for new installations. Lowpressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting such as street lamps. Sodium vapor lamps are some of the most efficient lamps in the world. It was moved to sodium vapour lamp earlier today for no reason. A sodiumvapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm two varieties of such lamps exist. Since its commercial introduction in 1932, the low pressure sodium lamp has consistently maintained its enviable position as the most efficient light source available. At higher pressures, new spectral lines appear highpressure sodium vapor discharge lamps emit a richer spectrum of yelloworange colors, are still quite. A sodiumvapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm. Sodiumvapor lamp definition of sodiumvapor lamp at. A lowpressure sodium vapor lamp or lpsv lamp is termed as a miscellaneous discharge lamp as it possesses some characteristics of.
The lamp works by creating an electric arc through vaporized sodium metal. Highpressure sodiumvapour lamp instrument britannica. The efficiency of a sodium vapour lamp under practical conditions is about 4050 lumenswatt. High pressure sodium lamps or hps lamps electrical4u. Aug 20, 2016 the mercury vapor lamp is a negative resistance device. The glass tube is made specially chemical resistant to withstand the chemical reaction of hot sodium. Welcome visitor you can login or create an account. Discharge lamps sodium vapour discharge lamp high pressure mercury vapour discharge neon lamp fluorescent tube 21 discharge lamps light is produced by passage of an electric current through a vapor or gas, rather than through a tungsten wire as in incandescent two types of discharge lamps 2. Use custom search function to get better results from our thousands of pages use for compulsory search eg. Of the six radioactive, artificial isotopes, sodium22 2. Lps sodium lamp gives 4750 hits, sox sodium lamp gives 812.
Sodium vapor lamp definition is an electric lamp that contains sodium vapor and electrodes between which a luminous discharge takes place and that is used especially for lighting highways. Ppt sources of light powerpoint presentation, free download id. Lamps classification lamp incandescent discharge low pressure high pressure mercury sodium mercury sodium metal halide lamps. Sodium vapour lamps produce an intense light and is often used to illuminate. Standard high pressure sodium lamp, tubular bulb clear, base e40. Mercury lamps sodium vapour lamps sodium vapour lamps have replaced mercury lamps due to. They are widely used on the streets for lighting purposes. A sodium vapor lamp is a gas discharge lamp that uses sodium in an excited state to produce light. Sodium vapour lamp incandescent light bulb equipment scribd. Principally sodium vapour lamp consists of a bulb containing a small amount of metallic sodium, neon gas and two sets of electrodes connected to a pin type base. Incandenscent lamp these lamps are known as filament lamps as it. Ballasts for high pressure mercury vapour lamps and ballasts for low pressure sodium vapour lamps standard by japanese industrial standard japanese standards association, 01011987. Lowpressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting, such as street lamps, where they are widely used.
When current passes between the electrodes, it ionizes the neon and argon. Sodiumvapor lamp article about sodiumvapor lamp by the. A lowpressure sodium vapour lps lamp contains an inner discharge tube made of borosilicate glass that is fitted with metal electrodes and filled with neon and argon gas and a little metallic sodium. Other materials and gases are used to help start the lamp or control its color. Lowpressure sodium lamps are the most efficient electrical light sources, but their yellow light restricts applications to outdoor lighting such as street lamps. In other words, the sodium migrates over time to the coldest part of the lamp, and it is the temperature at this region that determines the vapour pressure and which. Aug 26, 2014 light sources incandescent lamp discharge lamp florescent lamp sodium lamp high pressure mercury vapour lamp 3.
Dec 14, 2017 friends is video me ham discuss krenge sodium vapour lamp ke bare me. Lowpressure gaseous discharge sources are the fluorescent and lowpressure sodium lamps. A sodium vapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light. Getter inside the outer bulb of a sodium vapour lamp. Sodium vapour lamp free download as powerpoint presentation. The lamp operates at a temperature of about 300c and in order to conserve the heat generated and assure the lamp operating at normal air temperatures the discharge envelope is enclosed inspe cial vacuum envelope designed for this purpose. An amalgam of metallic sodium and mercury lies at the coolest part of the lamp and provides the sodium and mercury vapor in which the arc is drawn. The efficiency of sodium vapour lamps is between 40 to 50 lumens per watt with an average life of about 3000 hours. They generate light by sending an electrical charge through a gas to produce a plasma.
Containing sodium gas and inert gas either neon or argon mr. Apr 21, 2006 the origin of the sodium vapour lamp may be traced back to a 1919 patent taken out by arthur h. Sodium vapour lights are a type of gasdischarge lamp. Sodiumvapor lamp definition and meaning collins english. Other articles where highpressure sodiumvapour lamp is discussed.
The avoid shell of the sonlamps is internally coated with aluminum oxide powder. A sodium vapor lamp, also known as a gas discharge lamp, is a lamp that makes use of sodium to produce light. Sodiumvapour lamp definition of sodiumvapour lamp by the. Hps lamps give a whiter light and are used for extrabright lighting in. Apr 08, 2018 sodium lamp street lighting me use kiye jate he. Find here sodium vapour lamp suppliers, manufacturers, wholesalers, traders with sodium vapour lamp prices for buying. Therefore it requires a ballast to limit the current through it.
Sodiumvapour lamp, electric discharge lamp using ionized sodium, used for street lighting and other illumination. So if the lamp is connected directly to a constantvoltage source like the power lines, the current through it will increase until it destroys itself. Electrical articles 11 may 18 scientists have long been familiar with fact high luminous efficiency could be obtained by the use of sodium resistant glass, the sodium vapour lamp has now reached the practical stage. High pressure sodium vapour lamps with a polycrystalline translucent aluminum oxide discharge tube enclosed in an ovoid or tubular outer glass envelope. Highpressure sodiumvapour hps lamps have an inner discharge tube made of translucent alumina that can withstand the corrosive effects of a mixture of mercury and sodium under greater pressure and higher temperature. This requirement is met by operating the lamp for a stray field up tapped autotransformer with an open circuit secondary voltage of 470 to 480 volts. The construction and applications of sodium vapour lamps. All objects that we see are sources of light, even if they do not produce light. Working principle of sodium vapour lamp polytechnic hub. They have an efficiency of up to 190 lumens per watt compared to an incandescent street lamp which has between 15 and 19. Find details of companies offering sodium vapour lamps at best price.
This was the first light source which radiated the characteristic deep yellow sodium resonance lines compton, 1919. Sodium vapor lamp is the most energy efficient of all other lamps because it uses all its current to produce yellow light. Due to the long life, efficient energy usage and good vision, sodium vapor lamps are used for street lighting. A lowpressure sodium vapour lps lamp contains an inner discharge tube made of borosilicate glass that is fitted with metal electrodes and filled with neon and argon gas and a little. Discharge lamps sodium vapour discharge lamp high pressure mercury vapour discharge neon lamp fluorescent tube. A street lamp in which electricity is passed through sodium vapour to emit a yellow light. Sodium vapour lamp, electric discharge lamp using ionized sodium, used for street lighting and other illumination. Ppt sodium powerpoint presentation free to download.