Mercury vapour contained in an evacuated glass bulb. Us2749462a high pressure mercury vapor lamp with zirconium. After the experiment, leave the high pressure mercury vapour lamp to cool. Investigating the spectrum of a high pressure mercury lamp. Just a bit of a ramble about two mercury vapour lamps with some illumination of said lamps. A mercuryvapor lamp is a gas discharge lamp which uses mercury in an excited state to produce light. 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. During the last 15 years the luminous efficacy and the colour appearance of these mercury vapour lamps have been much improved by the application of europiumactivated. The inner surface of the lamp is coated with a fluorescent and often slightly phosphorescent coating made of varying blends of metallic and rareearth. Uv medium pressure mercury vapour lamps these uv lamps, emit across the entire spectrum of ultraviolet light uva, uvb and uvc with peak emission in the uva range at 366 nm. 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. The mercury lamp was the first kind of metal vapour light source that was mass produced for. Mercury lamps are used primarily for general street, parking and hibay industrial lighting applications where good efficiency and long life is desired and.
Mar 23, 2015 just a bit of a ramble about two mercury vapour lamps with some illumination of said lamps. The lamps come in both standard and high output selections and are ozone free. Two continuum lamps, a deuterium and a tungstenhalogen lamp, in combination with a monochromator generate light of 520 nm bandwidths in the spectral range from 190800 nm. The mercury vapor lamp is a high intensity discharge hid. Mercury vapor lamps are used widely for lightining purposes although their use is certainly decreasing, not that much related to performance issues but mainly due to the hazards associated with them, as we shall see later in this article. Mercuryvapor lamp an overview sciencedirect topics. High pressure sodium lamps or hps lamps electrical4u. Mercuryvapor lamp techsciencenews online reference. Uv lamps for sterilisation are low pressure mercury vapour lamps, which emit about 86% of their light at 254 nm.
For special applications, in addition to the usual mercury lamps, helios has developed a series of uv lamps metal halide adding doping elements metal. Find out information about high pressure mercury vapor lamp. Ignitors are only required up to 90 watt lamp rating. Mercury vapor lamps are high intensity discharge lamps that predate modern high pressure sodium and metal halide lamps. Amalgam lamps use a mercury amalgam mix to control mercury vapor pressure. High pressure mercury vapour lamps for general lighting. The high pressure mercury vapour discharge springerlink. They have a germicidal efficiency of 30% and can operate on lower current between 180 and 425ma.
According to wikipedia, high intensity discharge hid lighting is a type of electrical gasdischarge lamp that produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube. At the heart of the lamp is an arc tube which is fabricated from quartz, with a tungsten electrode disposed at either end. Fit a lens f 50 mm in the tilting rider and set it up about 10 cm from the lamp. The mercury vapor lamp is a high intensity discharge lamp. Place the adjustable slit another 10 cm or so beyond it, in such a way that the slit is well illuminated.
Pdf the mercury vapor lamp is the oldest high intensity discharge technology lamp that uses an electric arc, and comes in. Ozone free germicidal lamp relative spectral energy distribution 0 10 20 30 40 50 60 70 80 90 100. 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. The main reason for their use is primarily owing to the fact that the mercury lamps are not time barred i. In all gases, especially in those contained in discharge lamps, besides neutral gas atoms, some free electric charges. What are the advantages and disadvantages of the mercury lamp, sodium vapour lamp and xenon lamp used in photocatalysis. Mercury vapor technology was developed throughout the 1800s in england and germany.
Oct 14, 2014 high pressure 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. In mediumpressure mercuryvapor lamps, the lines from 200600 nm are present. Do not touch the body of the lamp after switching on. This gives a typical diffuse mediumpressure uv spectrum see figure 3. However, the first lowpressure lamps were sold commercially in the united states in 1901 after john cooper hewitt innovated the lamps color. High pressure mercury vapour lamps hpmv for general lighting purposes mercury free alternatives are not widely used. Mercury lamps get dimmer over time and rarely burn out, so it is wise to replace them and restore light. A mercuryvapor lamp is a gas discharge lamp that uses an electric arc through vaporized. Mercury vapour pressure is typically around ten atmospheres. Mercury in cold cathode fluorescent lamps and external electrode fluorescent lamps ccfl and eefl for electronic displays.
Pdf on mercury vapor lamps and their effect on the smart. Lamp type soft glass low pressure input power 480 w power density 0,250,3 wcm uvc radiation free standing metal thin film. Among the light sources in use for general lighting, high pressure mercury vapour h. Two centuries of electric light source innovations pdf. Find out information about highpressure mercuryvapor lamp. Us4199708a lowpressure mercury vapor discharge lamp. Mercury vapor lamps are becoming obsolete due to the higher efficiency and better.
Again transition of the electrons requires least amount of input energy from a colliding electron. Other advantages of the electronic ballasts are that the light is flickerfree and there is the. These types of lamps are available in ozone producing and ozone free. Low pressure mercury lamp learn what goes into ours.
States the methods of test for determining the characteristics of high pressure mercury vapour lamps with or without a red correcting fluorescent coating, operating on a. The luminous efficacy of any discharge lamp falls as wattage is reduced. After the experiment, leave the highpressure mercury vapour lamp to cool. Description the high pressure mercury lamp supplies a light with high luminosity. 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. Energy consumption of an energysaving lamp compared to a mercury vapour lamp.
Set up the highpressure mercury lamp roughly in the middle of the 1m optical bench. A discharge tube containing an inert gas and a small quantity of liquid mercury. 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. Hach replacement uv for toc analyzers, arc imaging, chromatography, photochemistry, calibration of uv detectors, calibrations of spectrophotometer, and more. The modern highpressure mercury vapor lamp is developed in the year 1936 by philips nederland no individual names are available. 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. Mercury vapor lamps are subdivided into low pressure, high pressure, and superhigh pressure lamps according to the operating pressure. Gives the performance requirements for high pressure mercury vapour lamps for general lighting purposes, with or without a red correcting fluorescent coating. It has a bluish green appearance and features a low initial cost. States the methods of test for determining the characteristics of highpressure mercury vapour lamps with or without a red correcting fluorescent coating, operating on a. 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.
It may be necessary to incline the tilting rider a. Once free electrons, ions and photons have been produced in the arc tube it is then very easy. Mercury vapor standard hpl high pressure mercury philips. Leakage reactance high loss control gear is used for 5w and 180watt lamps.
However, the first low pressure lamps were sold commercially in the united states in 1901 after john cooper hewitt innovated the lamp s color. 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. Philips mercury vapor lamps last at least 24,000 hours. Often called germicidal or ozone absorption lamps, they are very stable light sources. This wavelength coincides well with one of the two peaks of the germicidal effectiveness curve i. Mercuryvapor lamp a gasdischarge light source in which an electric. A fluorescent lamp tube is filled with a gas containing low pressure mercury vapor and argon, xenon, neon, or krypton. High pressure mercury vapour lamps eliptical get latest price by efficiently understanding the market trends, we are able to supplied and trading of high pressure mercury vapour lamps eliptica. It is very difficult to get any material which is free from corrosion in presence of sodium vapor in high temperature and pressure. Philips mercury vapor 250watt high pressure hid light bulb is ideal for use in landscape lighting, dusk to dawn, roadway, parking lots, floodlights and security fixtures. Mercury vapor lamps and their relatives are often used because they are relatively efficient. The line spectrum of the radiation, which has a high uv component, is in the wavelength range from about 579 nm to 248 nm. Low pressure mercury lamps have been manufactured in jelight company inc. Phosphor coated bulbs offer better color rendition than either high or low pressure sodium vapor lamps.
A mercury vapor lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light. The lamps can be constructed to emit primarily in the uva around 400 nm or uvc around 250 nm. Mercury vapour lamps dealing with breakages some items of laboratory equipment contain mercury vapour lamps to generate uv light. Mercury vapour this technology is no longer promoted mercury control gear are available in low loss wattages between 50w and 1kw single phase. Which material for substrate to make a free standing metal thin film. Softglass lamps are one of our quality low pressure mercury lamp products. Such lamps generate an atmosphere of mercury vapour at high pressure. Highpressure mercuryvapor lamps are those lamp commonly used for general. 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.
Electric lamps and their auxiliaries etd 23 designator of legally binding document. Mercury vapor lamps also offer a very long lifetime, as well as intense lighting for several applications. A mercury vapour lamp is a high pressure, electric arc discharge lamp that provides intense illumination over a selected range of wavelengths. Aug 20, 2016 a fluorescent lamp tube is filled with a gas containing low pressure mercury vapor and argon, xenon, neon, or krypton. Proposed format for the registration of exemptions for the. 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. High pressure mercury vapour lamps and their applications pp 551 cite as. High pressure mercury vapor lamp with zirconium getter download pdf info publication number us2749462a. Fluorescent lamps and lighting, philips technical library, 1959, chapter iv. 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. During the last 15 years the luminous efficacy and the colour appearance of these mercury vapour lamps have been much improved by the application of europiumactivated phosphors.
What is the working principle of mercury vapour lamp answers. 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. The clear mercury bulb has a bluish green appearance and the deluxe white has a higher color rendering. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. Mercury vapour this technology is no longer promoted mercury control gear are available in low. 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. Low pressure mercury vapor discharge lamp having a closed elongated lamp envelope and comprising at least two electrodes disposed near a first end of the lamp envelope, at least one electrode is situated at the end of at least one inner tube situated within and sealed in a gastight manner to the lamp envelope, this inner tube having at least one opening to the inside of the lamp envelope, the. It creates a very bright light by using an arc through vaporized mercury in a high pressure tube. Sodium vapor lamps are some of the most efficient lamps in the world.
High output germicidal lamp types highoutput quartz germicidal lamps. A mercury vapour lamp is a highpressure, electric arc discharge lamp that provides intense illumination over a selected range of wavelengths. What are the advantages and disadvantages of the mercury. 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. Highpressure mercuryvapor lamps are those lamp commonly used for general lighting purposes. Do not operate the high pressure mercury vapour lamp continuously for longer than 10 minutes. They have an efficiency of up to 190 lumens per watt compared to an incandescent street lamp which has between 15 and 19. A third, high pressure mercury vapour lamp provides high energy for scanning by fluorescence. Mercury vapor lamps feature low initial cost, but have higher operating costs than hps or metal halide due to its lower efficiency. As pressure increases the chance of multiple collisions gets increased.
The lamps are selected and positioned automatically. Dec 21, 2015 the modern high pressure mercury vapor lamp is developed in the year 1936 by philips nederland no individual names are available. Introduction the mercury vapor lamp is a high intensity discharge lamp. This is different from fluorescents which use the mercury vapor arc to create a weaker light. The outer bulb may be clear or coated with a phosphor. Both philips lamps, one brand new 50w and a very badly tortured 80w that still somehow runs. It uses an arc through vaporized mercury in a high pressure tube to create very bright light directly from its own arc.
High pressure mercury lamp instruction sheet 45115 safety notes mercury content 1. Mercury vapour lamp article about mercury vapour lamp by. Ed35 e17 high pressure sodium 35w ed50 e17 high pressure sodium 50w ed70 e17 high pressure sodium 70w lamp accessory select up to 2. The construction and applications of sodium vapour lamps. Pdf on mercury vapor lamps and their effect on the smartgrid plc.