Dec 31, 2018 mercury vapour lamp december 31, 2018 february 24, 2012 by electrical4u 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. Our production facility is designed to meet specific customer requirements to produce customized oneoff lamps, as well as achieve consistent quality in mass production. These high intensity uv line sources are specifically designed for pcb. Mercury use in lighting this fact sheet summarizes the use of mercury in lighting devices, such as fluorescent lamps, high intensity discharge hid lamps e. Once a lowpressure mercury vapour lamp has lit, the purpose of the chokeballast. Softglass lamps are one of our quality low pressure mercury lamp products. Lowpressure mercury lamp pumped atomic iodine laser of. Figure 614 shows the basic configuration of a hid lamp. The lamp is constructed from a hollow glass tube with an aluminium cap at each end. Within the tube are two electrode coils, one at either end. Pdf measuring the pressure in ultrahighpressure mercury lamps. Highpressure mercury lamp is a vapor or gaseous discharge lamp that uses mercury in an excited state to produce light. Again transition of the electrons requires least amount of input energy from a colliding electron.
Philips tuv low pressure mercury lamps and drivers. Philips medium pressure mercury lamps are available in a wide range of up to 180 w per centimeter, with an arc length between 10 and 140 centimeter. Low pressure uv lamps alphacure uv lamp manufacturer. Cooper hewitts low pressure mercury arc lamp is the direct parent of todays modern fluorescent lights. Do not operate the highpressure mercury vapour lamp continuously for longer than 10 minutes. Low pressure mercury lamp learn what goes into ours soft glass vs. Mercury vapor pressure does the mercury vapor pressure affect uv output in amalgam lamps. Ultraviolet uv light is found in the electromagnetic spectrum between visible light.
The low pressure mercury fluorescent lamps are commonly called as tube lights. Super high pressure mercury lamps jelight company, inc. This is the maximum attainable for a low cost general lighting lamp and is not all that far away from the maximum point shown on the graph. This is different from fluorescents which use the mercury vapor arc to create a weaker light that mainly creates uv light to excite the phosphors. High pressure mercury lamps for general lighting applications operate in the pressure range above point d, typically around 4,000 to 8,000 torr 510 atmospheres pressure. China high pressure mercury lamp manufacturers select 2020 high quality high pressure mercury lamp products in best price from certified chinese lamp manufacturers, pressure control switch suppliers, wholesalers and factory on. The term pressure is referred to the mercury pressure present in the lamps. These offer specific wavelength emission and provide wavelengths not available with the medium pressure mercury or led light sources. In addition to the mercury, the tube is filled with argon gas at low pressure. 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. This pressure amounts to somewhat less than one atmosphere, actually a slight vacuum. The mercury in the tube is a liquid at normal temperatures.
Medium pressure mercuryarc ushio produces standard and custom uv emitters. The uv source in low pressure mercury lamps and amalgam lamps that are commonly used for disinfection is a low pressure arcdischarge in mercury and inert gas vapors. The mercury vapor lamp is a high intensity discharge lamp. Be sure to consider all the options you might be able to find such as outdoor light, mercury lamp. The electric current excites the mercury vapor in the tube, generating radiant energy, primarily in the. A lowpressure sodium lamp is shown in the image below. China high pressure mercury lamp, high pressure mercury lamp. A mercury vapour lamp is a high pressure, electric arc discharge lamp that provides intense illumination over a selected range of wavelengths. China high pressure mercury lamp, high pressure mercury. Investigating the spectrum of a high pressure mercury lamp experiment objectives observe spectral lines on a screen determine wavelength using the littrow configuration investigate and measure differences in wavelength between lines that are close together observe pressure broadening 308 principles. Low pressure mercury lamp learn what goes into ours. This lamp is based on a standard close to the global standard for lowpressure mercury lamps made in europe and the united states. It is used for water treatments, uvozone cleaning andor ozone generation. Quartz glass softglass lamps are one of our quality low pressure mercury lamp products.
When the lamps are broken, they actually collapse, or implode, as the external positive atmosphere rushes to fill the space within the lamp at negative atmosphere. Lowpressure mercury discharge the most common form of germicidal lamp looks similar to an ordinary fluorescent lamp but the tube contains no fluorescent phosphor. This article discusses the construction and working principle of low pressure mercury fluorescent lamps also known as tube lights. Place the adjustable slit another 10 cm or so beyond it, in such a way that the slit is well illuminated. The lamps come in both standard and high output selections and are ozone free. Mercury vapor technology was developed throughout the 1800s in england and germany. Uv lowpressure lamps are available in various lengths, with various sockets and connections and in rod or ushape. To facilitate starting of the lamp, a third electrode is mounted near one of the main electrodes and connected through a resistor to the other main electrode. Hg pressures are usually above 20 mpa and difficult to measure. A mercury vapour lamp is a highpressure, electric arc discharge lamp that provides intense illumination over a selected range of wavelengths. Arc lamps may emit dangerous levels of uv radiation depending on their source type.
Hgxe arc lamps do have an unspecified shelf life, which over time can cause the end cap seals to leak and degrade lamp performance. Amalgam lamps use a mercury amalgam mix to control mercury vapor pressure. However, the first lowpressure lamps were sold commercially in the united states in 1901 after john cooper hewitt innovated the lamps color. A lamp typically compact halogen that provides both intensity and good color rendition. Mercury vapor lamps are highintensity discharge lamps that predate modern highpressure sodium and metal halide lamps. For single pulse operation it was demonstrated that a low pressure mercury lamp can successfully pump the atomic iodine laser using the active medium cf 3 3. During operation the body of the lamp will get hot so that there is a risk of getting burned. Their unique uv emission spectra make them popular for unique applications that need enhanced uv output such as uv spectroscopy, uv curing and other industrial processes, and environmental. The first lamp was a round bulb with two electrodes on each side. Philips tubular ultraviolet tuv purification lamps help protect our world by deactivating bacteria. The solid sodium metal remained on the bottom center of the bulb.
Ultrahigh pressure uhp mercury lamps are important as highbrightness light sources for digital projection. Lowpressure mercury lamp pumped atomic iodine laser of high efficiency. At the moment low pressure mercury discharge lamps are the state of the art technology. In addition to the medium pressure mercury and led light sources, vapourtec also offer three low pressure mercury lamps. Aging of lowpressure amalgam lamps and uv dose delivery article pdf available in journal of environmental engineering and science 92. Low pressure mercury lamps have been manufactured in jelight company inc. Fluorescent lamps3 operate at a very low gas pressure. High pressure mercury reflector lamp needless to use additional ballast as a substitute of incandescent bulb 2. It may be necessary to incline the tilting rider a little. Ultra violet uv lamps market global industry analysis. A low pressure mercury lamp is one of the most popular discharge lamps in labs, frequently used for wavelength calibration of optical measuring instruments and as a disinfection lamp to sterilize workspace and tools used in biology labs and medical facilities. Jelight company also produces super high pressure mercury lamps or short arc lamps. When considering the subject of lamp life we first need to understand the meaning of the word life. Considered a monochromatic light source most colors are rendered as gray.
Of these subsegments, amalgam mercury lamp accounted for over 40% of the total uv mercury lamp segment revenue and is anticipated to remain dominant during the forecast period. A low pressure mercury lamp lp hg lamp is a highly efficient uv light source of short wavelength. The average life of tube lights is about 5000 hours and also they are very cheap, hence they are very popular. The range of lights manufacturers,wholesalers we represented is extensive. Mercury hg arc lamps are ideal light sources for applications that require high intensity spectral lines emitted in the deep uv to visible light regions. Lowpressure mercury lamp pumped atomic iodine laser of high. All highintensitydischarge lamps produce light from an arc tube that is usually contained in an outer glass bulb. 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. Easy to install, low investment and maintenance cost 3.
High pressure mercury lamp instruction sheet 45115 safety notes mercury content 1. Uv lamp technologies what are they and which one is for you. For low flow rates and surface disinfection applications, low pressure lamps are most often used. A common discharge lighting luminary for use in an office environment would typically be a lowpressure mercury vapour electronic discharge fluorescent lamp.
Super high pressure mercury capillary flash lamps are used in a variety of applications due to the fact that they provide a high intensity source of both visible and ultraviolet radiation. In these lamps, a material, such as sodium, mercury, or metal halide, is added to the arc tube. However, regardless of other factors it is safe to say that there is a certain optimal pressure for each lamp. The line spectrum of the radiation, which has a high uv component, is in the wavelength range from about 579 nm to. Energysaving fluorescent lamps to low mercury fluorescent lamps in wattage and average life, both are comparable with each other with wattage at 3234 watts and an average life of 15,00020,000 hours for the 48inch lamps. For single pulse operation it was demonstrated that a lowpressure mercury lamp can successfully pump the atomic iodine. Pdf mercury free uv lamp for disinfection and purification of. However, only the low mercury fluorescent lamps will pass the tclp test.
Other chromatic variants may be used, combining different metallic vapors or modifying. A sodiumvapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm. Uv low pressure lamps are available in various lengths, with various sockets and connections and in rod or ushape. All arc discharge lamps including low pressure and high pressure tanning lamps have two different kinds of identifiable and measurable lives. The first fluorescent lamp was patented over 100 years ago by american inventor, peter cooper hewitt.
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. The term low pressure evolved as a result of the pressure contained within the glass tube. Pdf ultraviolet radiation sources found many application areas in science and technology. The operator can accept these or can override the automatic process by manual integration. It includes information on the total amount of mercury in all lamp products that were sold in the u. Firstly, they are tailored to respond to shortwave uv, whereas the high pressure discharge radiates a mixture of both short and longwave uv. Highpressure mercury lamps are available in versions where the discharge takes place in vaporized mercury only and in versions in which metal halides are added so that the discharge takes place in mercury vapor and in vaporized metals from the metalhalide components 2, 3. Due to the low heat load of the low pressure mercury lamps, lamps do not require filtering and allow a temperature range of 40c to 80c to be achieved. Hach replacement uv for toc analyzers, arc imaging, chromatography, photochemistry, calibration of uv detectors, calibrations of spectrophotometer, and more. But of more importance, high pressure mercury lamps run hotter than their low pressure counterparts the bulb wall temperature is typically of the order of 150 to 250c. The analysis of modern low pressure amalgam characteristics.
Slight color temperature shift, high luminous efficacy twice of the incandescent lamps 4. Do not touch the body of the lamp after switching on. Get in touch for more information on flow chemistry systems and services please use the contact methods below. They are available in lengths from the very small at 150 mm to up to 2400 mm. Low pressure lamps operate with mercury vapor pressure ranging from about 100 to pa.
Pdf aging of lowpressure amalgam lamps and uv dose delivery. Low pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor. December 31, 2018 february 24, 2012 by electrical4u. Highpressure mercuryvapor lamp definition 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. Uv lamps, germicidal lamps, mercury free lamps, quartz glass, disinfection, advanced oxidation process. Lowpressure sodium lampsproducing up to 180 lumens per watthave the highest efficacy of all commercially available lighting sources. Once a lowpressure mercury vapour lamp has lit, the. However, the first low pressure lamps were sold commercially in the united states in 1901 after john cooper hewitt innovated the lamp s color. Whats the difference between low pressure lp, amalgam low pressure. After the experiment, leave the highpressure mercury vapour lamp to cool. 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. Overview mercuryxenon arc lamps contain a tightly controlled mixture of xenon gas and mercury given them the combined uv spectral lines of an hg lamp with the ir spectral lines of a xe lamp. The lamps can be fitted with various types of end fitting from our catalogue, or equipped with customer special fittings, cables or pins.
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. The outer bulb reduces the ultraviolet radiation of the inner arc tube. Mercury vapor lamps are highintensity discharge lamps that predate modern high pressure sodium and metal halide lamps. If you are mainly looking for 2020 newest high pressure mercury lamp and high pressure mercury lamp factory, here you will find all the options you can ever have imagined. Fit a lens f 50 mm in the tilting rider and set it up about 10 cm from the lamp. 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. Low pressure sodium lamps were invented first in 1920 by arthur h. Measuring the pressure in ultrahighpressure mercury lamps. Ensure that only authorized personnel are in the vicinity of the source, and wearing the necessary safety equipment such as uv protective eyewear, clothing, and gloves. A common discharge lighting luminary for use in an office environment would typically be a low pressure mercury vapour electronic discharge fluorescent lamp. Job interview question, once a lowpressure mercury vapour lamp has lit, the purpose of the chokeballast unit is to. Download the uv lamp technologies pdf 594 kb for further information, including. Yes, it surely does the pressure determines the number of excited mercury atoms and thus determines uv output.
When heated up the metal would vaporize and the lamp would glow yellow. I and u can be applied to determine the lamp pressure in normal uhp lamps by a simple measurement of, i. 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. Low pressure mercury fluorescent lamps are commonly called tube lights.
Set up the highpressure mercury lamp roughly in the middle of the 1m optical bench. It needs to be vaporized and ionized before the lamp can produce its full light output. A wide variety of 300w high pressure mercury lamp options are available to you, such as voltage. In addition, uv mercury lamp is further subsegmented into lowpressure mercury lamp, mediumpressure uv lamp and amalgam mercury lamp. They have a germicidal efficiency of 30% and can operate on lower current between 180 and 425ma. Our study shows the potential application of combining tma with qfia for. However, only the low mercury fluorescent lamps will pass the. Ushio germicidal lamps are low pressure mercury arc lamps that emit radiation peaking at 253. Mercury xenon arc lamp shelf life we recommend purchasing replacement mercury xenon lamps only as needed. 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.
Description the high pressure mercury lamp supplies a light with high luminosity. 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. 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. Investigating the spectrum of a high pressure mercury lamp. Arc discharge takes place in a transparent tube inside a larger bulb of glass.
They produce light when an electric current passes between two electrodes also called cathodes in a tube filled with low pressure mercury vapor and inert gases, such as argon and krypton. When low pressure lp lamps receive the proper voltage and current from the ballast, an arc is struck from one end of the lamp to the other. Uv lamps from senlights crystec technology trading gmbh. However, the japanese specifications supercede the western ones in performances. He would create an arc through a metal, then observe what colors it produced when a prism.
Rather inconveniently, the phosphors known at the time had the awkward habit of greatly losing their efficiency at such high operating temperatures. A lowpressure discharge lamp in which light is produced by radiation from sodium vapor. They are available in lengths from the very small of 150 mm to up to 2400mm. About 4% of these are ultraviolet lamps, 8% are mercury lamps. Low pressure mercury fluorescent lamps or tube lights. A common discharge lighting luminary for use in an office environment would typically be a lowpressure mercuryvapour electronic discharge fluorescent lamp. 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. They differ only in the source of mercury vapor mercury lamps use a small amount of liquid metallic mercury, while amalgam lamps.