A sodiumvapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm. Sodium gas discharge lamps can be distinguished in two main groups. May 22, 20 there are two types of sodium lamps lowpressure lps highpressure son. Sodiumvapor lamp lowpressure sodium lps lamps have a borosilicate glass gas discharge tube arc tube containing solid sodium.
High pressure sodium lamp with clear tubular outer bulb. Low pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting such as street lamps. Thus, a uniform distribution of sodium along the discharge tube is achieved, which means a more stable discharge, a higher efficacy and a better lumen maintenance and lamp life. The lamp works by creating an electric arc through vaporized sodium metal. The object of the invention is to provide a small lowpressure sodium vapour discharge lamp which has a lower power consumption than a. Still has a bad color rendering compared to metal halide and halogen lamps requires a lossy. Ep00146a1 lowpressure sodium vapour discharge lamp. Other materials and gases are used to help start the lamp or control its color. Philips 90 watt sox pro low pressure sodium vapour lamp. While these lamps are highly energyefficient they are rarely used because all objects under their light appear to be yellow or yellowgray. About 20% of these are high pressure sodium lamps, 67% are ballasts, and 6% are street lights. Because their construction and performance is in many ways different, they are dealt with in two different. American national standard for electric lamps performance specifications for direct replacement led light emitting diode lamps american national standard for lamp ballastsballasts for highintensity discharge and lowpressure sodium lps lamps multiplesupply type. A lowpressure sodium lamp is shown in the image below.
Sodium vapor lamp low pressure sodium lps lamps have a borosilicate glass gas discharge tube arc tube containing solid sodium, a small amount of neon, and argon gas in a penning. A sodium atom has 11 electrons, and because of the way theyre stacked in orbit, one of the electrons is most likely to accept and emit energy. The lamps are also physically largeabout 4feet long for the 180watt sizeso light distribution from fixtures is less controllable. The lowpressure sodium lamp is also known as an lps lamp. Low pressure 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. A lowpressure sodiumvapour 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. A low pressure sodium vapour discharge lamp having a tubular discharge vessel 1 not more than 400 mm long and not more than 20 mm in diameter, which contains an excess of sodium, helium and at least one of the rare gases neon, argon, krypton and xenon. Lowpressure sodium lamps are highly efficient electrical light sources, but. Legally binding document step out from the old to the newjawaharlal nehru invent a new india using knowledge. Sodium vapour at high pressure and temperature is highly reactive with glass, which would rapidly fail as a result. The first mercury vapor lamps were in a lower pressure tube. Lowpressure sodium lamps have the highest efficacy of all commercially available lighting sources. Dec 25, 20 a sodium atom has 11 electrons, and because of the way theyre stacked in orbit, one of the electrons is most likely to accept and emit energy.
When current passes between the electrodes, it ionizes the neon and argon, giving a. Sodium vapour lamp free download as powerpoint presentation. Note, sodium vapour low pressure lamps generate poor quality yellow light with. Study of acoustic resonance phenomenon in high pressure. The heat generated by the arc then vaporizes the mercury and sodium. Aug 20, 2016 a fluorescent lamp tube is filled with a gas containing low pressure mercury vapor and argon, xenon, neon, or krypton. Sodium lamp performance is directly related to the gas pressure inside the arc cylinder. Unfollow low pressure sodium lamp to stop getting updates on your ebay feed. They are commonly used in public parking lots, roadways, and other security areas. Bullough, lighting design and application, september 2004. The inner surface of the lamp is coated with a fluorescent and often slightly phosphorescent coating made of varying blends of metallic and rareearth. Sodium vapour lights are a type of gasdischarge lamp. The lumen ratings of low pressure sodium lamps are based on the average performance of large groups of hps lamps operated at their rated watts in the. The common fluorescent lamp is actually a lowpressure mercury arc lamp.
Electrodes 30a, 30b are positioned in the discharge vessel 20 and are each connected to a current supply conductor 40a, 40b which issues from. Low pressure sodium lamp synonyms, low pressure sodium lamp pronunciation, low pressure sodium lamp translation, english dictionary definition of low pressure sodium lamp. Lowpressure sodiumvapour lamp instrument britannica. Lowpressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts. Contains easytounderstand explanations and examples for commercial and industrial energy technologies. Even though they emit a yellow light, a lowpressure sodium lamp should not be confused with a standard highpressure sodium lamp. Philips 90 watt sox pro lowpressure sodiumvapour lamp. Low pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor. Mar 10, 2020 high pressure 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.
There are two types of sodium lamps lowpressure lps highpressure son. High pressure sodium lamps or hps lamps electrical4u. Sodium vapour lamps neon tube fluorescent tubes\lamps the tubes filled with argon gas at low pressure and one. The outer bulb may be clear or coated with a phosphor. A low pressure 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. A fluorescent lamp is a low weight mercury vapour lamp that uses fluorescence to deliver visible light. The very yellow color does not attract insects but it distorts colors. The glass tube is made specially chemical resistant to withstand the chemical reaction of hot sodium. There is a brief warmup period for the lamp to reach full brightness.
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. 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. Low pressure sodium lighting flagstaff dark skies coalition. A mercuryvapor lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light. 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. Sodiumvapour lamp, electric discharge lamp using ionized sodium, used for street lighting and other illumination. Lowpressure sodium lamps operate much like a fluorescent lamp and require a ballast. Soxe low pressure sodium lamps is made of a special sodium resistant glass with dimples to collect the sodium in the cooling stage. A lamp breaking is extremely unlikely to have any impact on your health. This permits the use of ordinary glass types such as sodalime silicate or borosilicate, however a protective layer of special borate glass is blown onto the inner surface. Standard lumalux standard lumalux lamps are known for high efficacy, long life, and reliability. This occurs above molten sodium at 260c, and is illustrated in figure s9. For reasons of optimal efficacy the sodium vapour is kept at low pressure, which calls for a discharge tube of large dimensions having a relatively low operating temperature.
Sodium vapour pressure early experiments showed that for long positive column discharge lamps, maximum lamp efficacy occurs when the sodium vapour pressure is 0. Fluorescent lamp and working principle of fluorescent lamp. Lamps are available from 35 to 150 watts in medium base and 50 to. Lowpressure sodium lampsproducing up to 180 lumens per watthave the highest efficacy of all commercially available lighting sources.
This causes the valence electron of the sodium atoms to excite to higher energy levels. Sodium vapour lamps neon tube fluorescent tubes\ lamps the tubes filled with argon gas at low pressure and one. Even though they emit a yellow light, a low pressure sodium lamp should not be confused with a standard high pressure sodium lamp. High pressure sodium hps lamps, a member of the high intensity discharge. The fluorescent lamps or fluorescent tubes are low pressure mercuryvapor gas discharge lamps that use fluorescence to produce visible light. Long service life with high lumen output and low energy consumption. A fluorescent lamp tube is filled with a gas containing low pressure mercury vapor and argon, xenon, neon, or krypton. Lowpressure sodium lamp synonyms, lowpressure sodium lamp pronunciation, lowpressure sodium lamp translation, english dictionary definition of lowpressure sodium lamp. Low pressure sodium lamps operate much like a fluorescent lamp and require a ballast. A sodiumvapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light. Put them in a sealed plastic bag and take it to your local waste facilities for recycling.
The mercury vapor raises the gas pressure and operating. Sodium vapor lamps are some of the most efficient lamps in the world. The mercury vapour lamp in construction is similar to sodium vapour lamp. Sketch of a low pressure mercury vapour gas discharge fluorescent. It is still widely used in certain cities like bogota, san diego, and some european. Low pressure sodium lamps have the highest efficacy of all commercially available lighting sources. Other articles where lowpressure sodiumvapour lamp is discussed. The sodium lamp how it works and history edison tech center. One would tip the lamp, and electrical contacts on each side of the lamp would send electricity through a. The goal of this paper is to study how the vapour pressure and the electrical characteristics of a high pressure sodium hps lamp are affected by acoustic resonances to determine if some of those. A sodium vapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light. Study of acoustic resonance phenomenon in high pressure discharge lamps type mercury vapour and sodium. Low pressure and high pressure sodium vapour lamp gktoday. Sodium vapour lamp incandescent light bulb equipment scribd.
Low pressure sodium light has a number of very unique properties arising from its spectral output, many of which make it technically the most suitable light source for road lighting and these are covered in detail on the next page. They generate light by sending an electrical charge through a gas to produce a plasma. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. Currentpulsefed high pressure sodium lamps generate audible noise even if lamp power frequency does not excite longitudinal acoustic resonance modes inside the arc tube. Pdf the influence of high pressure sodium lamps on the power. High pressure sodium lamp long run 4y, tubular bulb clear, base e40. Product information high pressure and specification. When a high pressure sodium lamp is to be disposed, it is subject to the current epa toxicity characteristic leaching procedure tclp disposal criteria. 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. Pdf high pressure sodium vapor lamps due to long service life high light, as the most. Low pressure sodium lamps are used in outdoor lighting of some parking areas and bridge underpasses. There is an electric discharge when passing electricity through sodium vapors at high or low pressure.
All high pressure sodium lamps contain some amount of mercury. Capacitors for use in tubular fluorescent high pressure mercury and low pressure sodium vapour discharge lamp circuit number of amendments. Lowpressure sodium lamps operate much like fluorescent lamps and require ballast. When current passes between the electrodes, it ionizes the neon and argon. High pressure metal halide lamps high pressure sodium lamps. Since the early 1970s, the high pressure sodium lamp, has become one of the most important light sources for outdoor lighting thanks to its high luminous efficacy about 140 lmw, good color rendering via its golden white color appearance and long lamp life 24,00032,000 h. Lowpressure sodium lamps are one of the most efficacious light sources. If a lamp breaks, ventilate the room for 30 minutes and remove the parts, preferably with gloves. The gas in this case is sodium vapour, but several other gases may be such as mercury, ne. Sodiumvapour lamp definition of sodiumvapour lamp by. Increasing arc tube pressure improves the colour appearance of reds, blues, and greens. Sodiumvapour lamp definition of sodiumvapour lamp by the. All credits and sources are located at the bottom of each lighting page.
Sodium vapour lamp, electric discharge lamp using ionized sodium, used for street lighting and other illumination. Dec 14, 2017 friends is video me ham discuss krenge sodium vapour lamp ke bare me. Low pressure sodium lamps were invented first in 1920. In addition, the large physical size of the lamp means that it has a low surface luminance so it is less likely to give rise to glare, and the low operating. In a high pressure sodium lamp, a compact arc tube contains a mixture of xenon, sodium and mercury. A high pressure sodium lamp includes discharge vessel 20 which is enclosed with intervening space 1 by an outer bulb 10, which space contains a gasfill with at least 70 mol. This test is used to determine if an item can be managed as hazardous. See the photos lower on this page for more details. Low pressure sodium lamp, tubular bulb clear, monochromatic yellow light, base by22d.
Pdf modeling and checking the power quality of high pressure. Comparative study of 250 w high pressure sodium lamp. Lamptech museum of electric lamp technology sox lowpressure sodium. American national standard for electric lampshighpressure.
High pressure metal halide lamps high pressure sodium. Current pulse fed highpressuresodium lamps request pdf. So, for a high pressure sodium lamp, a ceramic arc tube body, known as translucent polycrystalline alumina pca and manufactured from aluminium oxide, is used instead. Even though they emit a yellow light, a lowpressure sodium lamp should not be confused with a standard highpressure sodium lamp, which is a high. It is still widely used in certain cities like bogota, san diego, and some european cities. Evaluation of low pressure sodium vapor illumination. The construction and applications of sodium vapour lamps. A wide variety of low pressure sodium lamp options are available to you, such as bulb type, application, and certification. Lowpressure sodium lamp definition of lowpressure sodium. Sodium retaining reservoirsprovide even distribution of sodium for 100% lumen maintenance, long lamp life and lamp wattage control.
A lowpressure sodium vapour discharge lamp having a tubular discharge vessel 1 not more than 400 mm long and not more than 20 mm in diameter, which contains an excess of sodium, helium and at least one of the rare gases neon, argon, krypton and xenon. Electrodes 30a, 30b are positioned in the discharge vessel 20 and are each connected to a current supply conductor 40a, 40b which issues from the discharge vessel 20 at a respective end 21a. High pressure sodium lamps lighting associates, inc. Soxe lamps are distinguished by the use of the black bases compared to the tan bases used on sox lamps. Dec 06, 2011 the low pressure sodium lamp is also known as an lps lamp. Acoustic resonance effects in high pressure sodium lamps. Lowpressure sodium lighting is a monochromatic source and is often rejected for its deficiency in supporting color. The lamp must be operated at horizontal or nearly horizontal position to keep the sodium uniform throughout. Pdf low pressure sodium vapor lamp installation guide. Lps lamp efficacy and lamp life apogee interactive. Currentpulsefed highpressuresodium lamps generate audible noise even if lamp power frequency does not excite longitudinal acoustic resonance modes inside the arc tube.
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