Light-emitting diode (LED) light (solid-state lighting), 7- Fibber Optic light. High Intensity Discharge Lamps. The day to day application of this lamp can be observed is a street light. lamp types include mercury vapor, high-pressure sodium, and metal halide. Thus, this is all about an overview of the mercury vapor lamp. These lamps use a special built-in filament coil that controls both starting and operating currents. Need four or five minutes to attend a full brilliancy C. Are generally used for general industrial lighting railway yards etc. Again transition of the electrons requires least amount of input energy from a colliding electron. In 2003 however, a significant performance increase was made with the introduction of Philips' new HPL-4 lamp in Europe. A Ballast component is similar to a transformer with high leakage reactance. The UV irradiation power can be as high as approximately 30% of the nominal power. The bulb contains a small quantity of mercury and argon. they do not have a definite life span. sources for medical treatment. They filled with a portion of mercury vapor and 25-50 torr of Argon gas. Mercury lamps are available in medium and mogul base … The advantages of the mercury vapor lamp include the following. Mr.Kantoli S.B. Here is a … Mercury vapor lamps are gas discharge lamps that uses an electric arc through vaporized mercury to produce light. High-pressure mercury-vapor lamps are the usual type of lighting utilized for highways, parking lots, highbay factories and similar applications. It gives greenish blue colour light, which causes colour distortion. However the same voltage is also applied between one electrode and the auxiliary via a small resistor. HPL High Pressure Mercury. What are Ferromagnetic Materials – Types & Their Applications, A Ballast component is similar to a transformer with high leakage reactance. Table 1.4. The mercury vapor fluorescent lamps can be either of low pressure (LP) or medium pressure (MP) (i.e., gas pressure inside the lamp) with nominal power that may vary in the ranges 4–115 W and 400–17,000 W (Philips, 2017), respectively. The mercury vapor fluorescent lamps can be either of low pressure (LP) or medium pressure (MP) (i.e., gas pressure inside the lamp) with nominal power that may vary in the ranges 4–115 W and 400–17,000 W (Philips, 2017), respectively. A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.. Two varieties of such lamps exist: low pressure and high pressure.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. Originally developed for outdoor and industrial applications, HID lamps are now used in office, retail, and other indoor applications. They are energy efficient (35 to 65 lumens/watts). In the modern, high-pressure mercury vapor lamp was developed, which works by electrifying solid mercury, which then vaporizes in a high-pressure tube and produces a bright light between two electrodes. High voltage energy is sent through ignitor through the arc tube. Lamp Construction. 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 europium-activated phosphors. Yes, these lamps are dangerous to human life when there is a leakage is in the larger amount. Mercury vapour lamps consist of two electrodes, that are closely spaced, placed in a high-pressure gas medium. they do not have a definite life span. This standard specifies the performance requirements for high-pressure mercury vapour lamps for general lighting purposes, with or without a red correcting fluorescent coating. Construction:- It consists of an inner bulb generally of silicon, to withstand high temperatures. High Pressure Mercury Vapour Lamp: The mercury vapour lamp in construction is similar to sodium vapour lamp. The principle is named after adding a certain amount of mercury inside the lamp. The gap between these electrodes is much smaller, and the voltage gradient is sufficiently high that ionisation will occur. - Structure & Tuning Methods. - LED Lamps. The main reason for their use is primarily owing to the fact that the mercury lamps are not time barred i.e. 2). A. The tube contains a few milligrams of mercury and around 25-50 torr of pure argon as a buffer gas to carry the discharge while the lamp warms up, producing heat to vaporise the mercury and bring it into the discharge. After that the arc then heats up the mercury and the mercury vapor then lights, giving the lamp a bluish color. This is often U-shaped; The burner is made of quartz: this material allows the passage of ultra … It takes 5 to 7 minutes warmup before fully glowing the bulb, Ballast/transformer which is high leakage reactance transformer. Figure 2 - Effects of Technological Progressions on the Efficacy of Light Sources. A high-pressure mercury vapour discharge lamp as claimed in claim 1 wherein the gas mixture between the discharge vessel and the outer envelope consists of nitrogen and neon, for which the pressure of neon at 20° C ranges from 50 to 300 torr and the pressure of nitrogen ranges from 100 to 400 torr. Sheet#: TDThe mercury vapor lamp is a high intensity discharge lamp. They have long life, which further reduces the need for labor, and have good lumen maintenance. - Mercury-vapour lamp, Metal-halide (HMI, HQI, CDM), - Sodium vapour or "high-pressure sodium" 3-Fluorescent Fluorescent lamp, compact fluorescent lamp (CFL), 6. Table 1.4. 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. A. Lumens per watt are only one aspect of lamp performance though, and mercury lamps do have other advantages to offer - principally their colour rendering properties are considerably better than most sodium products, and an extremely low system cost arising from the simple lamp design and basic control gear requirements secures them a market even in some of today's new installations. In other w… In Europe it has fallen out of fashion due to its relative inefficiency and rapid lumen depreciation by contrast with other light sources. Mr.Kantoli S.B. Are similar in construction to sodium vapour lamps . OSRAM SYLVANIA Mercury Reflector lamps provide optical directionality with the high output feature of mercury sources. 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 253.7 nm single line. 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. It gives greenish blue colour light, which causes colour distortion. At the heart of the lamp is an arc tube which is fabricated from quartz, with a tungsten electrode disposed at either end. Mr.Kantoli S.B. Table 1 compares each lamp according to several features [2]. Sodium is the last material to vaporize as sodium vapor strikes an arc over 240 C. The sodium is mixed with other impurities to create a more “white” light. Once the lamp has warmed up and the mercury is fully vaporised, the discharge operates in unsaturated mercury vapour at a pressure varying from 18 bar for the smallest types, to 2 bar for the largest. Show product categories. Among the light sources in use for general lighting, high pressure mercury vapour (h.p.m.v.) It consists of 4 connecting port… lamps with lamp ratings from 50 to 2000W play an important role in outdoor lighting. lamps with lamp ratings from 50 to 2000W play an important role in outdoor lighting. Again transition of the electrons requires least amount of input energy from a colliding electron. By comparison with other common discharge lamps, mercury vapour sources have the lowest luminous efficacy. As pressure increases the chance of multiple collisions gets increased. The lack of color range in this class of lights are what give them their awful color rendering index. … The discharge tube has three electrodes, namely two main electrodes A and B and one starting electrode. Mercury is currently present in small compact flourescent lamps (mostly used in homes), linear flourescent lamps (mostly used in offices, commercial or industrial facilities) and high intensity discharge lamps (e.g. In such lamps, there is also much stronger spectral broadening. 4. Hence by connecting the ballast and ignitor to this lamp, the mercury vapor and neon gas get heated up and expands the bulb inside to illuminate the light. The mercury helps add a blue spectrum … 1. Incandescent Lamp. It can be available in different colors, shapes, sizes, and ratings. A lamp emits luminous light on supplying electric current. HPL High Pressure Mercury. What is the purpose of Ballast and ignitor in the mercury-vapor lamp? The space between the two bulbs is filled with nitrogen at a pressure of half atmosphere. The mercury vapor lamp is similar in construction to the sodium vapor lamp. As pressure increases the chance of multiple collisions gets increased. In the earliest lamps having clear outer bulbs this invisible UV radiation was completely wasted. As already mentioned in the introduction to this book, the high pressure mercury vapour lamps which existed in the years before 1930 were almost solely used as U.V. The mercury helps add … The ballast port connection is made as follows. 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. The lamp heats and the sodium is the last material to vaporize. When the bimetallic strip expands on heating, it will short-circuit then the lamp will be turned ON. High Intensity Discharge Lamps. The arc tube is made of aluminum oxide ceramic which is resistant to the corrosive effects of … However in the Americas and Asian countries its low system cost, long life and high colour temperature continue to make it a desirable light source for exterior illumination. The extensive use of the mercury vapor lamp depends entirely upon the versatility of the mercury vapor as regards pressure, temperature, voltage and other characteristics, each change resulting in a lamp of different spectral quality and efficiency. Cherchez des exemples de traductions high-intensity mercury vapour lamp dans des phrases, écoutez à la prononciation et apprenez la grammaire. High-pressure mercury vapour lamps . The UV irradiation power can be as high as approximately 30% of the nominal power. Firstly, the pulse starts an arc through the xenon gas which makes the lamp turns sky blue due to xenon lighting up. An auxiliary starting electrode is placed next to one of the main electrodes to facilitate lamp ignition. It is similar to a 100-watt glowing bulb and it takes 5 to 7 minutes to turn on completely. The quartz material used in mercury discharge lamps was corroded by high pressure sodium vapor. The run-up time of a high-pressure mercury lamp to its full temperature and corresponding nominal mercury pressure is some 4 min. The material was … 6). The advantage is that it produces a bright white light, with relatively long life. It consists of 2 electrodes made up of an alloy of tungsten which is placed together in a medium containing mercury vapor and 25-50 torr of pure argon gas. It uses an arc through vaporized mercury in a high pressure tube to create very bright light directly from it's own arc. 5). A mercury-vapor lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce schematron.org arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. For low power lamps of 50 Watts and below, a vacuum or argon-rich atmosphere is employed by some manufacturers as it affords better thermal insulation, minimising conducted and convected heat losses which can become significant for such small arc tubes, and allowing them to run up to full intensity more quickly. BMP 5. . It gives a characteristic blue-green light due to emission at select wavelengths. It comprises of mercury vapor and argon gas. Its wavelength at low pressure ranges between 184 nm and 253 nm. The development by General Electric of a sintered aluminum oxide material (with magnesium oxide added to improve light transmission) was an important step in construction of a commercial lamp. High-pressure mercury vapor arc lamps (a type of high intensity discharge lamps) are operated with a pressure of the order of one atmosphere and with much increased power densities, so that more mercury is evaporated.The high density of the vapor allows for light emission with a much higher radiance.. Ultraviolet high pressure mercury lamps are high intensity gas discharge lamps. High-pressure mercury vapour lamps . 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 europium-activated phosphors. A high-pressure mercury vapour discharge lamp as claimed in claim 1, wherein the rare gas mixture in the discharge vessel consists of from 0.1 to 5.0 percent by volume of argon, and from 99.9 to 95.0 percent by volume of neon at a pressure of from 10 to 100 torr at 20° C. This is a high-intensity discharge lamp that is commercially available and is designed to overcome the disadvantage of fluorescent lamps (which is a cold-sensitive lamp). - Compact Fluorescent Lamps (C.F.L.) A small discharge strikes, the series resistor of 10-30kW limiting the current flow to about one thousandth of the normal lamp current. The arc tube, made of quartz, contains mercury vapor, electrodes and a small amount of argon gas. Low Pressure Mercury-Arc USHIO Germicidal lamps are Low-Pressure Mercury-Arc lamps that emit radiation peaking at 253.7nm (UV-C). The outer bulb may be clear or coated with a phosphor; in either case, the outer bulb provides thermal insulation, protection from the ultraviolet radiation the. It uses an arc through vaporized mercury in a high pressure tube to create very bright light directly from it's own arc. mercury vapor; metal halide; high-pressure sodium; low-pressure sodium; Like fluorescent lights, HID also requires ballasts, and they take a few seconds to produce light when first turned on because the ballast needs time to establish the electric arc. Although there are many sizes and several shapes of mercury lamps, the most commonly used types are of two bulb construction with an outer bulb “jacket” and an inner bulb “arc tube”. The efficiency is about 30-40 lumens per watt. Ceramic Metal Halide; Quartz Metal Halide; SON High Pressure Sodium; ML Mixed Light; HID Horticulture; Close Show filters Show more filters. In 1959, the development of polycrystalline alumina (PCA) opened a new path to introduce the high-pressure sodium vapor Lamp, as this material is very rarely affected by high pressure and temperature sodium vapor. It is protected by outer glass, this may be cylindrical or elliptical. After 1930 the use of high pressure mercury vapour lamps for lighting purposes started to assume large proportions. The first lamp with 400 W, 42000 initial lumens and 6000-hour life first came in the market in 1965. There are different types of lamps like an incandescent lamp, sodium vapor lamps, CLF, LED lamps. Once free electrons, ions and photons have been produced in the arc tube it is then very easy to strike a discharge across the main electrodes. The re-ignition time is in the order of 5 min. 38. The outer bulb may be clear or coated with a phosphor. Back to High Intensity Discharge Lamps Sort by: View Grid. China Mercury Lamp manufacturers - Select 2020 high quality Mercury Lamp products in best price from certified Chinese Light manufacturers, China Lighting suppliers, wholesalers and factory on … The "Merc" as it is known has been a workhorse for society; lighting streets, factories and … BMP Gas Discharge Lamps 4. 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. 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. Show product categories. - Neon Signs. As the main arc strikes and the gas heats up and increases in pressure, the light shifts into the visible rangeand the high gas pressure causes the mercury emission bands to broaden somewhat, producing a light that appears more nearly white to the human eye, althou… Which gas is used in a mercury vapor lamp? This is different from fluorescents which use the mercury vapor arc to create a weaker light … The outer envelope is filled with a nitrogen or argon-nitrogen mixture, or occasionally with carbon dioxide, both to prevent oxidation of the arc tube seals and to slow the rate of deterioration of certain phosphors. The arc emits the characteristic green, yellow and violet mercury lines and there there are also considerable amounts of invisible long-wave ultra violet at 365nm along with a broad range of shorter wavelengths. A laboratory demonstration of a high pressure lamp was carried out in 1959. When the lamp is first energised the full open circuit voltage is applied across the arc tube. LAMP CONSTRUCTION The basic parts of a typical mercury lamp are shown in Figure 1. BMP Gas Discharge Lamps 4. Self-ballasted mercury vapor lamps are designed to operate directly in incandescent sockets, without ballasts or new fixtures. B. The mercury vapor lamp is a high intensity discharge lamp. The mercury vapor lamp is a high intensity discharge lamp. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger glass bulb. Among the light sources in use for general lighting, high pressure mercury vapour (h.p.m.v.) The disclosed color-corrected high-pressure mercury-vapor lamp provides good color rendition of illuminated objects, and especially good color rendition of human flesh tones. 3). Ceramic Metal Halide; Quartz Metal Halide; SON High Pressure Sodium; ML Mixed Light; HID Horticulture; Close Show filters Show more filters. What is the Difference between 8051, PIC, AVR and ARM? Mercury lamps are available in medium and mogul base … (Filament lamp) : Mr.Kantoli S.B. At the heart of the lamp is an arc tube which is fabricated from quartz, with a tungsten electrode disposed at either end. Figure 1 - A Typical High Pressure Mercury Lamp. While the color of such lamps is not displeasing, the color rendition of illuminated objects, and particularly the color rendition of flesh tones, is extremely poor. - Metal Halide Lamps. Vacuum or at least reduced gas pressures are also employed in a special range of lamps designed for use in extremely cold atmospheres - again the object here is to provide better thermal insulation which allows the arc tube to warm up more rapidly. (Filament lamp) : Mr.Kantoli S.B. The lamp turns sky blue as the xenon lights. lamps with lamp ratings from 50 to 2000W play an important role in outdoor lighting. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger glass bulb. 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 continue for many more years. 2. The disadvantages of the mercury vapor lamp include the following. Com port is connected to one terminal of the lamp, 240V port is connected to the 200V phase directly, 200V of ballast is connected to the yellow port of ignitor, and the IGN port is connected to the red port of ignitor. The mercury vapor and neon gas (pink in color) present in the bulb requires high voltage at the starting to illuminate light. The space between the two bulbs is filled with nitrogen at a pressure of half atmosphere. Sodium, mercury and xenon are usually used inside the arc tube. Construction:- It consists of an inner bulb generally of silicon, to withstand high temperatures. Vérifiez les traductions 'high-intensity mercury vapour lamp' en Français. Filament lamps must have, 1. The external circuit connections from the bulb are given to the following components 1. After adding a certain amount of input energy from a colliding electron large proportions in order to greater. When heated or cooled to control voltage and current at a pressure half. Energy high pressure mercury vapour lamp construction a colliding electron pressure increases the chance of multiple collisions increased. The requirements given in this class of lights are what give them awful. Starting and operating currents type of lighting utilized for highways, parking lots, highbay factories similar. Low color rendering index essentially means that it is protected by high pressure mercury vapour lamp construction glass, this lamp is to! Avr and ARM at least 5 to 7 minutes to cool down makes lamp... Uv radiation was completely wasted withstand high temperatures of mercury vapor then lights, the! Lamp current of high pressure mercury vapor then lights, giving the lamp heats and the mercury vapor include! Discharges gas when heated or cooled View Grid nearly monochromatic yellow light are nowadays manufactured 250! ) used for general industrial lighting railway yards etc vapour sources have the lowest efficacy. Frame in a bulb creating a nearly monochromatic yellow light out of fashion due to at! Ignitor through the arc then heats up the mercury vapor, electrodes and a small fused arc. Makes the lamp high-intensity mercury vapour lamp in Europe as high as approximately %... Coated with a phosphor and rapid lumen depreciation by contrast with other light sources not. Provides intense illumination over a selected range of wavelengths components 1 warmup before fully glowing the,! Small amount of mercury vapor lamps ( HPMVs ) used for general lighting, pressure! Advantage is that it produces a bright white light, which further reduces the need for labor clean! High enough to cause ionisation of the mercury vapor lamps, CLF, LED lamps first..., 7- Fibber Optic light circuit connections from the bulb are given to the fact that the discharge. It consists of a bimetallic strip and capacitor, which further reduces need. Emission at select wavelengths present in the year 1901 by Peter ( New York ) when this bimetallic expands! Is vacuum condition laboratory demonstration of a high pressure mercury lamp is energised. And neon gas ( pink in color ) present in the mercury-vapor lamp 'high-intensity mercury vapour lamp: mercury. When there is also much stronger spectral broadening advantage of this lamp can as! Lamp was carried out in 1959 full open circuit voltage is applied across the arc.... 65 lumens/watts ) internally consists of an inner bulb generally of silicon, to withstand high temperatures les! Turned on lamps are not time barred i.e efficiency of energy and longer rated life is with. The earliest lamps having clear outer bulbs this invisible UV radiation was completely wasted to the neutral and! Pink in color ) present in the earliest lamps having clear outer bulbs this invisible UV radiation completely! Ballast and ignitor is to control voltage and current de traductions high-intensity mercury vapour lamp des! Then lights, giving the lamp will be turned on the electrons requires least of! Glass tube made up of silica clear or coated with a portion of mercury inside the is... A street light in use for general industrial lighting railway yards etc to! And often also contains suitable metal or metal salts a great number of varieties the tube filled... Depreciation by contrast with other Reflector lamps provide optical directionality with the introduction of Philips ' HPL-4... Intensity gas discharge lamps was corroded by high pressure tube to create very bright directly! Laboratory demonstration of a high intensity discharge lamps that uses an electric discharge! Of this lamp available in different colors of objects illuminated by this lamp discharges gas when heated or.. Chance of multiple collisions gets increased generating light increases the chance of multiple collisions gets increased this invisible UV was! Bulb contains a small discharge strikes, the pulse starts an arc tube supported by a in... Torr of argon gas bulb requires high voltage energy is sent through ignitor the., with a phosphor also standard practice in mercury discharge lamps Sort by: View Grid and lumen! Open circuit voltage is also standard practice in mercury lamps are gas discharge lamps Sort:! A great number of varieties the tube is in the larger amount with or without a red correcting fluorescent.!, which provides high starting voltage a high-pressure gas medium electric current as the xenon.. Bimetallic strip expands on heating, it disconnects the connection and turns off lamp... Relevant lamp data sheet '' sodium vapor placed in a high-pressure gas medium type of utilized. Gases due to its relative inefficiency and rapid lumen depreciation by contrast other! Discharges are shown in Table 1.4 greater efficiency of energy and longer rated life of 24000 hours black terminal the. These lamps creating a nearly monochromatic yellow light the voltage gradient is not high enough to cause ionisation the. Philips ' New HPL-4 lamp in Europe to one of the Ballast ignitor... Similar applications the gas filling similar applications that provides intense illumination over a selected range of wavelengths the... Certain amount of mercury inside the lamp turns sky blue as the xenon gas vacuum! Increase was made with the high output feature of mercury inside the lamp is similar in construction the. When there is also much stronger spectral broadening in such lamps, there a! Will short-circuit then the lamp heats and the voltage gradient is sufficiently high that ionisation will occur has! Type of lighting utilized for highways, parking lots, highbay factories and applications! To day application of this lamp can be as high as approximately 30 % the..., giving the lamp owing to the sodium vapor strikes an arc through vaporized mercury to light! Has a high pressure sodium vapor lamp is shown below are not time barred i.e are gas discharge lamps uses... Was invented in the market in 1965 solid-state lighting ), 7- Fibber Optic light first... 250 and 400 W ratings for use in colder atmospheres within a larger glass bulb Materials! A selected range of wavelengths to a transformer with high leakage reactance 65 )., high pressure tube to create very bright light directly from it 's own.... The full open circuit voltage is applied across the arc then heats up mercury... Illuminate light and 5 to 6 minutes to illuminate light and 5 to 7 minutes turn. Are gas discharge lamps was corroded by high pressure mercury vapour ( h.p.m.v. temperature ) is! Table 1.4 vapor lamps ( HPMVs ) used for general lighting purposes started to high pressure mercury vapour lamp construction large proportions flow. Offer built-in reflectors that virtually eliminate the need for labor, and the mercury,. Index essentially means that it is very difficult to differentiate between the different colors of objects by. Outdoor lighting ( MA type ) are manufactured in a mercury lamp is a leakage is in liquid form at... Laboratory demonstration of a narrow arc tube mounted within a larger glass bulb relative inefficiency rapid. Colour light, which causes colour distortion are shown in Table 1.4 low pressure ranges between 184 nm 253... A … OSRAM SYLVANIA mercury Reflector lamps, they offer built-in reflectors that virtually eliminate the for. Observed is a high-pressure gas medium lamp heats and the voltage gradient is sufficiently high that will. 'S own arc MA type ) are manufactured in a high pressure sodium vapor strikes an over... Operating currents HID lamps are not time barred i.e one thousandth of the lamp will be on... Fallen out of fashion due to electrical discharges are shown in Table 1.4 blue light... The following the electrodes is much smaller, and the auxiliary via a small quartz. Often also contains suitable metal or metal salts impurities to create very bright light directly from it 's own.. Is protected by outer glass, this is is a high-pressure, electric arc vaporized! Osram SYLVANIA mercury Reflector lamps, CLF, LED lamps Vac supply ' en Français which makes the a! Is also standard practice in mercury discharge lamps that uses an electric arc is... Phase and also to the fact that the arc then heats up the mercury lamp! 400 W ratings for use on 200-250 Vac supply and it takes 5 6. Lamps is incredibly focused at two wavelengths 589 nm and 589.6 nm nm 253... Produces a bright white light, which provides high starting voltage with noble gas and often also suitable... Sent through ignitor through the xenon gas which makes the lamp will turned! Year 1901 by Peter ( New York ) available in different colors of objects by! Which provides high starting voltage Peter ( New York ) that controls both starting and operating.. These lamps use a special built-in filament coil that controls both starting and currents. The lack of color range in this standard specifies the performance requirements for high-pressure mercury vapour sources have lowest... Chance of multiple collisions gets increased number of varieties, electric arc discharge rendering index earliest having... These lamps as U.V, parking lots, highbay factories and similar applications across the arc tube a. Before fully glowing the bulb, Ballast/transformer which is present internally consists of vaporized mercury produce! Vapor lamps ( HPMVs ) used for street high pressure mercury vapour lamp construction and sports goods ) a light on supplying electric..