Highpressure mercury lamp is a vapor or gaseous discharge lamp that uses mercury in an excited state to produce light. Turn off the highpressure mercury lamp and wait several minutes for it to cool down. They have an efficiency of up to 190 lumens per watt compared to an incandescent street lamp which has between 15 and 19. Low pressure mercury lamp learn what goes into ours. High pressure mercury vapour lamps for general lighting. Our production facility is designed to meet specific customer requirements to produce customized oneoff lamps, as well as achieve consistent quality in mass production. A mercury vapour lamp is a high pressure, electric arc discharge lamp that provides intense illumination over a selected range of wavelengths.
I want to do this for efficiency reasons, i would get a lot more light out of a high pressure sodium bulb than a mercury vapour bulb and there would be slightly reduced power consumption too. A sodiumvapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm. They emit a characteristic monochromatic yellow light that is ideal for certain exterior street and area lighting applications. Mar 10, 2020 high pressure sodium lamps or hps lamps march 10, 2020 february 24, 2012 by electrical4u 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. A lowpressure mercury vapourfilled discharge lamp as claimed in any one of claims 4 to 8, wherein said cathodes are coated with a material including one of baal2o4 and lia1o2 10. A lowpressure mercury lamp lp hg lamp is a highly efficient uv light source of short wavelength. Low pressure mercury lamps produce monochromatic radiation at 254 nm wavelength which makes them ideal for disinfection and sterilisation applications. In some versions, fluorescent powder is applied that converts the ultraviolet part, which is emitted together with visible light, into visible light to improve the color. Electronic ballasts combine ignition component, com pensation. They are commonly used in public parking lots, roadways, and other security areas. The reason for the creation of this second category of mercury lamp was to allow the efficacy to be maintained as high as possible for low wattage sources.
Us7291980b2 highpressure mercury vapor discharge lamp. This is because, the mercury vapour lamp can feed almost the entire visible region 380780 nm of the human visual system. The mercury lamp was the first kind of metal vapour light source that was mass produced for general lighting applications, and still today it remains one of the most popular discharge lamps produced globally. Mercury vapor lamps are highintensity discharge lamps that predate modern highpressure sodium and metal halide lamps. Here also, the excited electrons of mercury atoms relax by emitting characteristic but ultraviolet 254nm, invisible light. Sodium vapor lamps are some of the most efficient lamps in the world. Light sources incandescent lamp discharge lamp florescent lamp sodium lamp high pressure mercury vapour lamp 3. After the experiment, leave the high pressure mercury vapour lamp to cool. Mercuryvapor lamp a gasdischarge light source in which an electric. Figure 614 shows the basic configuration of a hid lamp.
Classified as in the same group as fluorescent lamps or germicidal lamps, the main light emission is a 254nm line comprising an 185nm line of far shorter wavelength. Nov 02, 1976 a high pressure, mercury vapor hpmv discharge lamp of the additive type having a discharge sustaining filling which includes between 0. A fluorescent lamp is a low weight mercury vapour lamp that uses fluorescence to deliver visible light. 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. This results in a warmer color appearance and higher color rendering than standard mercury lamps. Ushio germicidal lamps are low pressure mercury arc lamps that emit radiation peaking at 253.
Warmup of a color corrected 80 w high pressure mercury vapor lamp to half brightness when a mercury vapor lamp is first turned on, it will produce a dark blue glow because only a small amount of the mercury is ionized and the gas pressure in the arc tube is very low, so much of the light is produced in the ultraviolet mercury bands. Us7291980b2 highpressure mercury vapor discharge lamp with. Download electrical engineering interview questions and answers pdf. Set up the ocular such that the yellow lines are well in focus. However, the first low pressure lamps were sold commercially in the united states in 1901 after john cooper hewitt innovated the lamp s color. Conventional low pressure and amalgam lamps are significantly more energy efficient than medium pressure lamps. In europe it has fallen out of fashion due to its relative inefficiency and rapid lumen depreciation by contrast. Mercury vapor lamps are subdivided into low pressure, high pressure, and superhigh pressure lamps according to the operating pressure. Lowpressure sodium lamps are highly efficient electrical light sources, but. Arc discharge takes place in a transparent tube inside a larger bulb of glass. A mercuryvapor lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light.
A mercury vapour lamp is a highpressure, electric arc discharge lamp that provides intense illumination over a selected range of wavelengths. The lamps come in both standard and high output selections and are ozone free. A discharge tube containing an inert gas and a small quantity of liquid mercury. Lowpressure mercury vapourfilled discharge lamp, luminaire. Due to the long life, efficient energy usage and good vision, sodium vapor lamps are used for street lighting. In case of fluorescent lamp the mercury vapour pressure is maintained at lower level such that 60% of the total input energy gets converted into 253. Tungsten, oxygen and halogen atoms combine at the bulbwall to form tungsten oxyhalide. Fluorescent lamp and working principle of fluorescent lamp. What are the advantages and disadvantages of the mercury lamp.
It,s intensity decays over time, but the bulbs have a longer lifetime. High pressure mercury vapor discharge lamp containing bismuth. Do not operate the high pressure mercury vapour lamp continuously for longer than 10 minutes. This international standard specifies performance requirements for ballasts for discharge lamps such as highpressure mercury vapour, lowpressure sodium vapour, highpressure sodium vapour and metal halide lamps. Job interview question, once a low pressure mercury vapour lamp has lit, the purpose of the chokeballast unit is to. These lamps have an operating lifetime of up to 12,000 hours and convert up to 40% of the lamps electrical power into uvc, offering an efficient and costeffective alternative to medium. Further improvement is achieved in many of the lamp types by the addition of a phosphor coating to the inside surface of the outer bulb. Once a lowpressure mercury vapour lamp has lit, the purpose. Lowpressure mercury vapour discharge lamp having a very satisfactory colour rendition and a colour temperature from 2300 to 3300 k. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. Best applications for mercury vapor lamps eye lighting. The mercury vapour lamp in construction is similar to sodium vapour lamp.
The luminous efficacy of any discharge lamp falls as wattage is reduced. Lowpressure amalgam lamps amalgam lamps use a mercury amalgam mix to control mercury vapor pressure. Characteristics and features everything about blood pressure and its measurement. Product information high pressure and specification. There are 1,771 suppliers who sells mercury lamp on, mainly located in asia. A mercuryvapor lamp is a gas discharge lamp that uses an electric arc through vaporized.
At the heart of the lamp is an arc tube which is fabricated from quartz, with a tungsten electrode disposed at either end. This pressure in turn depends on the temperature of the coldest section of the arc tube and the quantity of mercury introduced into the tube. Two centuries of electric light source innovations pdf. The lamp is constructed from a hollow glass tube with an aluminium cap at each end. Medium pressure lamps produce the greatest uv output per unit length of lamp of the 3 lamp types.
Low pressure uv lamps alphacure uv lamp manufacturer. Within the tube are two electrode coils, one at either end. A high pressure, mercuryvapor hpmv discharge lamp of the additive type having a discharge sustaining filling which includes between 0. High pressure sodium lamps or hps lamps electrical4u.
Turn on the mercury lamp and observe the double yellow line as the lamp heats up. Aug 12, 2012 nizkotlaka sodikova vybojka versus vysokotlaka rtutova vybojka low pressure sodium lamp versus high pressure mercury vapour lamp osram sox 55w 8100lm osram hql 125w 6300lm moje. Similar to highpressure mercury lamps or highpres sure sodium lamps, metal. 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. Lamp that produces light as a result of an electrical discharge, generated between two electrodes, in a highpressure mercury vapor that is contained in a transparent bulb. White light source xenon lamp has uniform excitation intensities across all the visible range. Oct 14, 2014 lamp that produces light as a result of an electrical discharge, generated between two electrodes, in a high pressure mercury vapor that is contained in a transparent bulb. A lowpressure mercury vapourfilled discharge lamp as claimed in any one of claims 4 to 9, where said first gas is a combination of xenon and mercury. Can i fit a 70w high pressure sodium bulb in an 80w. Download the uv lamp technologies pdf 594 kb for further information, including. These offer specific wavelength emission and provide wavelengths not available with the medium pressure mercury or led light sources. Whats the difference between low pressure lp, amalgam low pressure lp, and. Mercury vapor is the original and now the oldest hid technology and has been supplanted by other hid types that offer higher efficiencies and better color properties.
Sodium vapor lamp is the most energy efficient of all other lamps because it uses all its current to produce yellow light. Low pressure and high pressure sodium vapour lamp gktoday. Recyclers collect such removed lamps, combine them with. Lamp output in the uv range depends on the amount of mercury and vapor. A high pressure mercury vapor discharge lamp has an envelope which contains two electrodes made from tungsten and a filling in a discharge space. This coating covers more than 70% of the diameter of the lighted length of the lamp. This is different from fluorescents which use the mercury vapor arc to create a weaker light. Medium pressure mercury arc ushio produces standard and custom uv emitters. The common fluorescent lamp is actually a lowpressure mercury arc lamp. A wide variety of mercury lamp options are available to you, such as 220v, 380v, and 110v. The top countries of suppliers are china, taiwan, china, and india, from which the percentage of mercury lamp supply is 99%, 1%, and 1% respectively. May 06, 1998 a low pressure mercury vapour filled discharge lamp as claimed in any one of claims 4 to 8, wherein said cathodes are coated with a material including one of baal2o4 and lia1o2 10. Hach replacement uv for toc analyzers, arc imaging, chromatography, photochemistry, calibration of uv detectors, calibrations of spectrophotometer, and more. It uses an arc through vaporized mercury in a high pressure tube to create very bright light directly from its own arc.
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. During operation the body of the lamp will get hot so that there is a risk of getting burned. Replacing mercury vapor or incandescent sources with metal halide or high pressure sodium will generally. Low pressure mercury lamps have been manufactured in jelight company inc. Read online electrical engineering job interview questions and. A high pressure sodiumvapor lamp a sodiumvapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.
Mercury vapor lamps are highintensity discharge lamps that predate modern high pressure sodium and metal halide lamps. 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. Im wondering if i could get away with fitting a 70w high pressure sodium bulb with internal ignitor into a fitting containing an 80w mercury vapour ballast without having to do any modifications. 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. The fact that the high pressure mercury vapour lamp could be introduced successfully as a practical light source, is due to the favourable spectral light distribution, the high luminous efficiency, the relatively small lamp dimensions and the possibility of an extensive range.
However, the first lowpressure lamps were sold commercially in the united states in 1901 after john cooper hewitt innovated the lamps color. The sputtered electrons from the filaments, after having been accelerated by high voltage, hit the mercury atoms. Low pressure uv lamps without phosphor coating operating at the same pressure compared. Do not touch the body of the lamp after switching on. Mercury lamps are used primarily for general street, parking and hibay industrial lighting applications where good efficiency and long life is desired and color rendering needs. Low pressure mercury lamp in addition to the medium pressure mercury and led light sources, vapourtec also offer three low pressure mercury lamps. Job interview question, once a lowpressure mercury vapour lamp has lit, the purpose of the chokeballast unit is to. Mercury vapor technology was developed throughout the 1800s in england and germany. Low pressure discharge technology for general and special lighting purposes is covered by the exemptions 14a, such. In lowpressure mercuryvapor lamps only the lines at 184 nm and 254 nm are present.
A wide variety of 300w high pressure mercury lamp options are available to you, such as lighting and circuitry design, project installation, and agi32 layout. Once a lowpressure mercury vapour lamp has lit, the. High pressure mercury vapor discharge lamp containing. A lowpressure mercuryvapor lamp has a characteristic emission line at 253 nm. New high power amalgam lamps are significantly more powerful than low pressure lamps. The mercury vapor lamp is a high intensity discharge lamp.
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. Once a lowpressure mercury vapour lamp has lit, the purpose of the chokeballast unit is to submitted by. This is because most of the light emitted from a sodium vapour lamp is concentrated in the yellow part of the visible spectrum around 580590 nm. Low pressure amalgam lamps amalgam lamps use a mercury amalgam mix to control mercury vapor pressure. A mercury vapor lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light. Again transition of the electrons requires least amount of input energy from a colliding electron. It was not feasible to make an ma style lamp below about. The tube contains a few milligrams of mercury and around 2550 torr of pure argon as a buffer gas to carry the discharge while the lamp warms up, producing. Mercury vapour lamp is quite suitable for lighting applications. Investigating the spectrum of a high pressure mercury lamp. As pressure increases the chance of multiple collisions gets increased. All highintensitydischarge lamps produce light from an arc tube that is usually contained in an outer glass bulb. Ep0229428a1 lowpressure mercury vapour discharge lamp. The outer bulb may be clear or coated with a phosphor.
A common discharge lighting luminary for use in an office environment would typically be a lowpressure mercuryvapour electronic discharge fluorescent lamp. Aug 26, 2014 light sources incandescent lamp discharge lamp florescent lamp sodium lamp high pressure mercury vapour lamp 3. The construction and applications of sodium vapour lamps. Administrator a discharge voltage b correct power factor c suppress radio interference d limit lamp current answer d submitted by. Sox low pressure sodium lamps sox lamps are the most efficient hid light source. Dec 31, 2018 in case of fluorescent lamp the mercury vapour pressure is maintained at lower level such that 60% of the total input energy gets converted into 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. The common fluorescent lamp is actually a low pressure mercury arc lamp. The filling essentially consists of mercury, rare gas, and a halogen that is free in the operating condition. High pressure mercury vapour lamps for general lighting purposes. May 22, 20 the mechanism in mercury vapour lamp is more involved and sequential.
The lamp is provided with a luminescent layer comprising. Find out information about highpressure mercuryvapor lamp. Softglass lamps are one of our quality low pressure mercury lamp products. Medium pressure mercuryarc ushio produces standard and custom uv emitters. Rather than a cold spot, the lamps 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. High pressure sodium vapour lamps hps for general lighting.
The outer bulb reduces the ultraviolet radiation of the inner arc tube. Mercury vapour lamps dealing with breakages some items of laboratory equipment contain mercury vapour lamps to generate uv light. In a high pressure sodium lamp light is produced by sodium vapour, the gas. A common discharge lighting luminary for use in an office environment would typically be a low pressure mercury vapour electronic discharge fluorescent lamp. Rather than a cold spot, the lamps amalgam spot on pellet regulates mercury vapor pressure during operation and yields up to three times the uvc output. Space constraints, highflow requirements low pressure medium pressure kw per lamp. After the experiment, leave the highpressure mercury vapour lamp to cool. Such lamps generate an atmosphere of mercury vapour at high pressure. Uv lowpressure lamps are available in various lengths, with various sockets and connections and in rod or ushape. Mercury vapour lamp article about mercury vapour lamp by.
Low pressure mercury vapour discharge lamp having a very satisfactory colour rendition and a colour temperature from 2300 to 3300 k. Mercury vapour pressure is typically around ten atmospheres. The light output of a selfballasted lamp is a blend of incandescent and mercury vapor light. Types of lamps suhail tp mes collage of engineering 2. Regardless of what you may have read on some sites, mercury vapor bulbs do not emit any uvc at any distance. They have a germicidal efficiency of 30% and can operate on lower current between 180 and 425ma. High pressure mercury vapour lamps hpmv for general lighting. A low pressure mercury vapour filled discharge lamp as claimed in any one of claims 4 to 9, where said first gas is a combination of xenon and mercury. Hps retrofits for mercury lamps, and will operate on all mercury reactor ballasts. 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. Once a low pressure mercury vapour lamp has lit, the purpose of the chokeballast unit is to submitted by.
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