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. High pressure lamps high pressure metal halide lamps high pressure sodium lamps low pressure sodium lamps high pressure quartz metal halide lamps ceramic metal halogen lamps philips hid lamps master citywhite cdoet ceramic metal halide lamp, with opalized ovoid outer bulb shape, used in outdoor offering pleasant white light. Sodium vapor lamp is the most energy efficient of all other lamps because it uses all its current to produce yellow 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 two varieties of such lamps exist. Duquesne light commercial library apogee interactive.
Low pressure sodium light bulbs sox low pressure sodium. 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. The lamps must be stored and transported in the original packing. In gas discharge lamps, light is generated primarily by an electrically excited plasma. The discharge tube may be linear sli lamp 2 or ushaped.
High pressure sodium lamps lighting associates, inc. 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. In mediumpressure mercuryvapor lamps, the lines from 200600 nm are present. The peak is at 592 nm, however the lamps dominant wavelength was measured at 588,6 nm. May 22, 20 there are two types of sodium lamps lowpressure lps highpressure son. Shop philips 327817 35 watt low pressure sodium 4550 lumens dc bayonet base ansi l70 sox35 at today. High pressure sodium lamps may be used in open luminaires except for item 67527 lu400t7 rsc and sox low pressure sodium, which must be operated in an enclosed fixture. 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.
High pressure metal halide lamps high pressure sodium lamps low pressure sodium lamps high pressure quartz metal halide lamps ceramic metal halogen lamps philips hid lamps master citywhite cdoet ceramic metal halide lamp, with opalized ovoid outer bulb shape, used in outdoor offering pleasant white light. Fused silica is used in the manufacturing to keep the 184 nm light from being absorbed. A change away from low pressure sodium would be made for other reasons, such as a desire for better color. The switch from lowpressure sodium to light emitting diodes.
The mercury vapour lamp in construction is similar to sodium vapour lamp. It is still widely used in certain cities like bogota, san diego, and some european cities. The sodium vapour lamp is only suitable for a alternating current, the, therefore, required chock control. The following information is provided by osram sylvania as a courtesy to its customers. A sodium vapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light. The lights require up to 10 minutes to start and are best used when they can stay on for hours at a time. Aug 20, 2016 a fluorescent lamp tube is filled with a gas containing low pressure mercury vapor and argon, xenon, neon, or krypton. Increasing arc tube pressure improves the colour appearance of reds, blues, and greens. Vertical burning is permitted only for the low wattage lamps, but only with the cap uppermost.
Cities are just using them because the lamps are more directional and the city does not believe they will need to put out as much light. Within the tube are two electrode coils, one at either end. When a high pressure sodium lamp is to be disposed, it is subject to the current epa toxicity characteristic leaching procedure tclp disposal criteria. Rather than a cold spot, the lamp s amalgam spot on pellet regulates mercury vapor pressure during operation and yields up to three times the uvc output of a standard low pressure mercury lamp of the same length. Figure s36 linear selfstarting low pressure sodium lamp it is interesting to note that whereas most low pressure sodium lamps have been developed to deliver the maximum luminous efficacy, these early linear sources appear to have been optimised instead for generating the maximum luminous flux with a high surface luminance. A wide variety of low pressure sodium light fixture options are available to you.
Lowpressure sodium lamp definition of lowpressure sodium. Sylvania brand low pressure sodium lamps are exempted from the requirements of the osha hazard communication standard 29 cfr 1910. This coating covers more than 70% of the diameter of the lighted length of the lamp. Lowpressure sodium lamps are one of the most efficacious light sources.
Low pressure sodium lamps soxe and sox warmup characteristics effects of input voltage variations. If a lamp breaks, ventilate the room for 30 minutes and remove the parts, preferably with gloves. Product information high pressure and specification. Lumalux super and sox lamp ratings are based on measurements at constant input voltage. Low pressure sodium lamp synonyms, low pressure sodium lamp pronunciation, low pressure sodium lamp translation, english dictionary definition of low pressure sodium lamp. They are particularly useful for outdoor applications in cities where light pollution ordinances. Light sources incandescent lamp discharge lamp florescent lamp sodium lamp high pressure mercury vapour lamp 3. Ordering code bulb soxe 18 t17 sox 35 t17 sox 55 t17 sox 90 t21 sox 5 t21 sox 180 t21 max. Dec 06, 2011 the low pressure sodium lamp is also known as an lps lamp. Measurements were made using a usb2000 spectrometer by ocean optics.
Low pressure sodium vapor lpsv lamps are used in physics labs. The construction and applications of sodium vapour lamps. Sodium vapour lamp, electric discharge lamp using ionized sodium, used for street lighting and other illumination. 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. Put them in a sealed plastic bag and take it to your local waste facilities for recycling.
Lowpressure sodiumvapour lamp instrument britannica. 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. Lowpressure sodium lighting is a monochromatic source and is often rejected for its deficiency in supporting color. Warnings,cautions and operating instructions for ceramalux high pressure sodium lamps ceramalux high pressure sodium lamps low total cost of ownership long lifeup to 24,000 hours high efficacy up to 140 lpw. Low pressure sodium lamps are used in road lighting, railway marshalling yards and crossings, airports, harbours and docks, quarries, foundries and rolling mills. About 6% of these are street lights, 86% are ballasts, and 3% are high pressure sodium lamps. Because their construction and performance is in many ways different, they are dealt with in two different. The lps lamp was the first sodium lamp to be developed. Working principle of sodium vapour lamp polytechnic hub.
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 must be kept as close as possible to 260c. Lamps are available from 35 to 150 watts in medium base and 50 to. Be sure power supply is off before installing or removing lamp. Ushio germicidal lamps are lowpressure mercuryarc lamps that emit radiation peaking at 253. Designed by experienced engineers, and by using quality material in combination with a tightly controlled manufacturing process, we provide high quality lamps free of impurities to maintain strong and stable output throughout life of the lamp. A wide variety of low pressure sodium lamp options are available to you, such as bulb type, application, and certification. Because the low pressure sodium lamp is very efficient, it was very suitable for lighting the streets in large numbers. There are several differences between low and high pressure sodium lights. It is known by its signature monochromatic yellow color. All high pressure sodium lamps contain some amount of mercury. This test is used to determine if an item can be managed as hazardous. 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. Rsc and sox low pressure sodium, which must be operated in an enclosed fixture.
Low pressure sodium lamp synonyms, low pressure sodium lamp pronunciation, low pressure sodium lamp translation, english dictionary definition of low pressure sodium. Lowpressure sodium lamps operate much like fluorescent lamps and require ballast. Led lights produce broad spectrum white light compared to lps street lights that emit narrow spectrum, orange light. The lamps are also physically largeabout 4feet long for the 180watt sizeso light distribution from fixtures is less controllable. Bullough, lighting design and application, september 2004.
Sodium gas discharge lamps can be distinguished in two main groups. They have an efficiency of up to 190 lumens per watt compared to an incandescent street lamp which has between 15 and 19. These comes in 35w 55w and of philips ge osram make, imported. Sodium retaining reservoirsprovide even distribution of sodium for 100% lumen maintenance, long lamp life and lamp wattage control. Lamps are available from 35 to 150 watts in medium base and 50 to watts in mogul base, and most types are available in clear and coated. Low pressure sodium lamp definition of low pressure sodium. They are commonly used in public parking lots, roadways, and other security areas. High pressure sodium lamps are the most efficient artificial white light source with about 29% of the energy used by the lamp producing light. Low pressure sodium lamps are one of the most efficacious light sources. The high pressure lights produce a more desirable golden to white light, while the color produced by low pressure lights is yellow to orange. The only strategies to improve the energy efficiency of a low pressure sodium system is to avoid overlighting and limit the hours of use to essential times. It is mostly used in europe since it did not appeal in other markets due to its poor cri or color rendering.
Lumen rating sylvania high pressure sodium lamps, with the exception of lumalux super and sox lamps, are based on burning cycles of at least 10 hours per start and ballasts which meet ansi standards. Low pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting such as street lamps. Lamptech museum of electric lamp technology sox lowpressure sodium. They shed light in a color spectrum ranging from yellow to orange, usually in a relatively low intensity.
Low pressure sodium bulbs produce light in a very narrow, yellow region of the visible spectrum. Low and high pressure sodium lights are found in parking lots and areas where security is important. The information in this document is provided as a courtesy and is intended to. The inner surface of the lamp is coated with a fluorescent and often slightly phosphorescent coating made of varying blends of metallic and rareearth. Introduction this technical statement is intended to advise specifiers and users of the relative merits of the various high intensity discharge lamps and control gear options that will provide the best economic and light technical benefits for their installations. These bulbs have a long rated life and high efficency, but virtually no ability to render color. When current passes between the electrodes, it ionizes the neon and argon, giving a. Sodium lamp performance is directly related to the gas pressure inside the arc cylinder. Dec 25, 20 sodium vapor lamps are very effective in fog while fluorescent lamps produce little glare. Contains easytounderstand explanations and examples for commercial and industrial energy technologies. There is a brief warmup period for the lamp to reach full brightness.
The reason for choosing sodium is that it has a high vapour pressure, which means that it is relatively easy to vaporise as required for use in a discharge lamp. Greater inclinations can result in the liquid sodium running down to the lower end of the lamp with the result that the upper part of the lamp becomes depleted of sodium vapour and efficacy is lost. A fluorescent lamp tube is filled with a gas containing low pressure mercury vapor and argon, xenon, neon, or krypton. A lamp breaking is extremely unlikely to have any impact on your health. Best applications for mercury vapor lamps eye lighting. High pressure sodium lights are more popular than low pressure lights because of this significant color difference. High pressure sodium lights have a better color rendition than low pressure sodium lights. This yellow light was once widely used for street lighting but has lost popularity to the highpressures sodium lamp. Many of the led streetlamps going up only have an efficiency of 8590 lw. Are led street lights actually more efficient than high.
Dispose of in accordance with federal, state and local requirements. Sodium vapor lamps are some of the most efficient lamps in the world. Sox lamps are also known as polarimeter lamps used in physics lab. Even though there may be room in low pressure sodium technology to extend its lifetime further, manufacturers can earn greater revenues with more modern light source technologies and for commercial reasons it is no longer interesting to invest effort in the further improvement of the low pressure sodium lamp. 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. A common discharge lighting luminary for use in an office environment would typically be a low pressure mercury vapour electronic discharge fluorescent lamp. In lowpressure mercuryvapor lamps only the lines at 184 nm and 253 nm are present. The aperture phosphorcoated lamps that jelight company produces employ the same basic design as the doublebore, low pressure mercury vapor lamps with the exception of a special phosphor coating. Cleveland, oh 44112 usa less than 1% of the mercury in a high pressure sodium lamp is in vapor form and will be released if a lamp is accidentally broken. Lamp volts lamp current lamp watts light output lamp volts lamp current lamp watts light output. Material safety data sheet msds requirements for materials are not applicable to manufactured articles in which individuals would not be subjected to materials contained in the article dur ing its normally intended use. Son son high pressure sodium philips philips lighting.
Chapter low pressure discharge lamps slide 7 incoherent light sources prof. The arc tube of this lamp contains sodium and mercury. Soxe lamps are distinguished by the use of the black bases compared to the tan bases used on sox lamps. A low pressure sodium vapor lamp or lpsv lamp is termed as a miscellaneous discharge lamp as it possesses some characteristics of highintensity discharge hid lamps as well as it resembles fluorescent lamps in other areas. The lamp is constructed from a hollow glass tube with an aluminium cap at each end. Sont son high pressure sodium philips philips lighting. Mercury vapor lamps have found the greatest use in industrial applications and outdoor lighting, because of their low cost and long life, and lamp sizes of up to 1,000 watts. We used a beforeaftercontrolimpact paired design to examine the effects of a switch from lowpressure sodium lps to light emitting diode led street lights on bat activity at twelve sites across southern england. High pressure metal halide lamps high pressure sodium lamps. Dec 25, 20 christmas day experiment, low pressure sodium lamp run up. Soxe low pressure sodium lamps is made of a special sodium resistant glass with dimples to collect the sodium in the cooling stage.
High pressure metal halide lamps high pressure sodium. Because mercury lamps are so prevalent in current outdoor lighting, and still safe when properly installed in a serviceable fixture, the need for these products will. Due to the long life, efficient energy usage and good vision, sodium vapor lamps are used for street lighting. 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. At you can purchase at least 6 different low pressure sodium light bulbs.
Media in category sodium vapor discharge lamps the following 107 files are in this category, out of 107 total. High pressure sodium lamps or hps lamps electrical4u. Standard lumalux standard lumalux lamps are known for high efficacy, long life, and reliability. Sylvania low pressure sodium bulbs sylvania low pressure sodium bulbs genesis lamp.517 104 888 809 449 1207 130 1064 249 1479 589 768 71 605 237 802 103 635 744 831 1023 1251 892 1497 1177 1046 185 1377 918 233 682 581 331 1260 347 552 700 596 423