Newport also recommends using an electronic shutter to block the beam when the source is not in use but remains turned on. Usually, the borosilicate glass outer bulb of the lamp performs this function but special care must be taken if the lamp is installed in a situation where this outer envelope can become damaged. It does not affect the use of mercury in compact fluorescent lamp, nor the use of mercury lamps for purposes other than lighting. Remove this product from your comparison list? Rated life of mercury arc lamps is as follows: HBO 50W : 100 hrs. What is the definition of mercury arc lamp? 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. After a lamp has reached its rated life in hours, it should be inspected for cloudiness. They have many intense bands at wavelengths across the UV and visible light spectrum and emit bright UV light. [citation needed]. Although other types of HIDs are becoming more common, mercury vapor lamps are still sometimes used for area lighting and street lighting in the United States. Because of the light emitted by the filament, they have slightly better color rendering properties than mercury vapor lamps. [4] In February 1896 Herbert John Dowsing and H. S. Keating of England patented a mercury vapor lamp, considered by some to be the first true mercury vapor lamp.[5]. Even at full intensity, the light from a mercury vapor lamp with no phosphors is distinctly bluish in color. Choose products to compare anywhere you see 'Add to Compare' or 'Compare' options displayed. When the lamp is in operation, the mercury within the tube evaporates completely and creates the required pressure. Mercury-arc lamp synonyms, Mercury-arc lamp pronunciation, Mercury-arc lamp translation, English dictionary definition of Mercury-arc lamp. HXP lamps are short arc lamps in which the discharge arc burns in an atmosphere of mercury vapour at very high pressure. Mercury vapor lamps are more energy efficient than incandescent and most fluorescent lights, with luminous efficacies of 35 to 65 lumens/watt. 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 and medical applications. Clear mercury lamps produce white light with a bluish-green tint due to mercury's combination of spectral lines. In contrast, xenon arc lamps contain pure xenon gas. The strongest peaks of the emission line spectrum are[12][13]. "Mercury Lamp" redirects here. HBO mercury lamps are short arc lamps in which the luminous arc burns in an atmosphere … As the main arc strikes and the gas heats up and increases in pressure, the light shifts into the visible range and the high gas pressure causes the mercury emission bands to broaden somewhat, producing a light that appears more nearly white to the human eye, although it is still not a continuous spectrum. (This electrical potential in the presence of the halides can cause the failure of the glass/metal seal). Additional CAD file downloads are not available for this product. HBO 100W: 200 hrs. A very closely related lamp design called the metal halide lamp uses various compounds in an amalgam with the mercury. Login to view your complete order history. To correct the bluish tinge, many mercury vapor lamps are coated on the inside of the outer bulb with a phosphor that converts some portion of the ultraviolet emissions into red light. Most modern mercury vapor lamps have this coating. These lamps use a tungsten filament in series with the arc tube both to act as a resistive ballast and add full spectrum light to that of the arc tube. Sodium iodide and scandium iodide are commonly in use. The mercury short-arc lamps commonly utilized in fluorescence microscopy are gas-discharge lamps that contain a mixture of liquid mercury and an inert gas (such as argon or xenon), housed within a glass envelope together with a pair of closely spaced electrodes. The XLB series lamp ballasts are offered in 7 sizes from 150 to 6000 watts and are constant current sources designed for precision operation of short-arc Xenon lamps. The MLB series Mercury lamp ballasts are offered in 5 sizes from 650 to 7000 watts. Newport strives to keep Hg bulbs in stock to reduce lead times when ordering a replacement. In low-pressure mercury-vapor lamps only the lines at 184 nm and 254 nm are present. The mercury vapor lamp is a negative resistance device. 0 Antworten: stern lamp - Hecklaterne: Letzter Beitrag: 12 Jul. The center discharge tube of the high-pressure mercury lamp is made of quartz glass. It continued in use in more specialized applications where a high intensity point light source wa… [2], Charles Wheatstone observed the spectrum of an electric discharge in mercury vapor in 1835, and noted the ultraviolet lines in that spectrum. mercury =… 3 Antworten: arc welder's eye - die Schweißerophtalmie: Letzter Beitrag: 26 Okt. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. Creating a nearly shadow-free light and less glare, the lamp immediately found wide use for industrial and street lighting in the United States. The 6283NS Mercury Arc Lamp contains an exactly measured amount of mercury and either argon gas or xenon which acts as a starter gas as the mercury vaporizes. ©2021 Newport Corporation. Mercury vapor lamp ballasts are similar to the ballasts used with fluorescent lamps. The first mercury vapor lamp to achieve widespread success was invented in 1901 by American engineer Peter Cooper Hewitt. In addition to the mercury, the tube is filled with argon gas at low pressure. Product family … In medium-pressure mercury lamps, a plasma that emits UV light is generated by applying electrical voltage. [16], In the US, ballasts for mercury vapor lamps for general illumination, excluding specialty application mercury vapor lamp ballasts, were banned after January 1, 2008. Self-ballasted mercury vapor lamps can be screwed into a standard incandescent light socket supplied with the proper voltage. [1] "Color corrected" mercury bulbs overcome this problem with a phosphor on the inside of the outer bulb that emits white light, offering better color rendition. [citation needed], Mercury vapor lamps are used in the printing industry to cure inks. 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. The arc tubes of high-pressure lamps, which have a diameter of 8–60 mm and a length of 30–1,500 mm, are made of refractory, transparent quartz glass and are filled with an inert gas and a certain quantity of mercury. 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. Continued vaporization of the liquid mercury increases the arc tube pressure to between 2 and 18 bar, depending on lamp size. [6] Hewitt was issued U.S. Patent 682,692 on September 17, 1901. Lighted UV warning signs, posted outside laboratory doors where UV sources are operating, can prevent accidental exposure. It is recommended to vent the ozone that is produced by some lamp models to the outside or use an Ozone Eater. In fact, the first British fluorescent lamps were designed to operate from 80-watt mercury vapor ballasts. [citation needed], High-pressure mercury vapor (and some specially-designed metal-halide) lamps find application in molecular spectroscopy due to providing useful broadband continuum ("noise") energy at millimeter and terahertz wavelengths, owing to the high electron temperature of the arc plasma; the main UV emission line of ionized mercury (254 nm) correlates to a blackbody of T= 11,500 K. This property makes them among the very few simple, inexpensive sources available for generating such frequencies. A mercury arc lamp, broadly speaking, is constructed of a long sealed quartz tube which is filled with a starting gas and a small amount of mercury and has an electrode at each end. The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the first decade of the 1800s, was the first practical electric light. There are also self-ballasted mercury vapor lamps available. Department of Energy §431.286 Energy conservation standards and their effective dates. When outside, coated or color corrected lamps can usually be identified by a blue "halo" around the light being given off. A mercury-vapor lamp is a gas-discharge lamp that uses an electric arc through vaporized mercury to produce light. The increase in pressure results in further brightening of the lamp. For placements where light pollution is of prime importance (for example, an observatory parking lot), low-pressure sodium is preferred. They use a lot of energy and generate heat. This helps to fill in the otherwise very-deficient red end of the electromagnetic spectrum. In the EU the use of low efficiency mercury vapor lamps for lighting purposes was banned in 2015. These lamps can produce much better quality light without resorting to phosphors. Enter your email address below to reset your account password. [6] The ultraviolet light from mercury vapor lamps was applied to water treatment by 1910. Provide an order number and postal code to check the status of an order or download an invoice for an order that has shipped. Even with these methods, some UV radiation can still pass through the outer bulb of the lamp. These lamps have only the same or slightly higher efficiency than incandescent lamps of similar size, but have a longer life. [1] For these reasons, they are used for large area overhead lighting, such as in factories, warehouses, and sports arenas as well as for streetlights. We recommend purchasing replacement Mercury lamps only as needed. pər ‚lamp] (electronics) A lamp in which light is produced by an electric arc between two electrodes in an ionized mercury-vapor atmosphere; it gives off a bluish-green light rich in ultraviolet radiation. One of the original complaints against mercury lights was they tended to make people look like "bloodless corpses" because of the lack of light from the red end of the spectrum. 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 light produces, and a convenient mounting for the fused quartz arc tube. Mercury arc lamps are the workhorses of the curing industry. Advanced Radiation Corporation's series of direct current Mercury Short Arc Lamps for photolithography represents the state-of-the-art in design, manufacture, and performance of high intensity ultraviolet sources. To access this and other valuable technical resources, please sign in or register for a new online account. Fused silica is used in the manufacturing to keep the 184 nm light from being absorbed. High-pressure mercury-vapor lamps are commonly used for general lighting purposes. Arc Lamp, Mercury, 100 W, 0.25 x 0.25 mm Effective Arc Size, Arc Lamp, Mercury, 50 W, 2.0 x 0.35 mm Effective Arc Size, Arc Lamp, Mercury, 200 W, 0.6 x 2.2 mm Effective Arc Size, Arc Lamp, Mercury, 500 W, 1.1 x 4.1 mm Effective Arc Size, Arc Lamp, Mercury, 350 W, 0.8 x 2.7 mm Effective Arc Size, Socket Adapter, 50W Hg Lamp, For Q Series Lamp Housings, Lamp Socket Adapter, For 6283NS 200 W Mercury Lamp, Lamp Socket Adapter, For 6282 50 W Mercury Lamp, UV Protective Gloves, Size 8, Black Neoprene, Set of 3, Ultraviolet Protective Gloves, Size 10, Black Neoprene, Set of 3, Safety Goggles, UV Light Sources, Flexible Frame, Low Power Research Series Mercury Light Sources. What is the meaning of mercury arc lamp? Polycarbonate suffers particularly from this problem, and it is not uncommon to see fairly new polycarbonate surfaces positioned near the lamp to have turned a dull, yellow color after only a short time. As it emits narrow spectral lines at two very close wavelengths, it is the easiest to filter out. [20] When used in locations like gyms, the fixture should contain a strong outer guard or an outer lens to protect the lamp's outer bulb. They emit primarily in the blue and green. "Understanding high intensity discharge lighting", https://en.wikipedia.org/w/index.php?title=Mercury-vapor_lamp&oldid=1000243231, Articles needing additional references from April 2013, All articles needing additional references, Articles with unsourced statements from December 2015, Articles with unsourced statements from February 2019, Creative Commons Attribution-ShareAlike License, This page was last edited on 14 January 2021, at 08:24. 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. This means its resistance decreases as the current through the tube increases. It was widely used starting in the 1870s for street and large building lighting until it was superseded by the incandescent lightin the early 20th century. Some bulbs include a thermal switch which shorts the starting electrode to the adjacent main electrode, extinguishing the starting arc once the main arc strikes. If you have turned a 100W burner on only 10 times for 20 hr periods and otherwise cared for it properly, it may not be cloudy and last for many hours beyond its rated life. [19] There have been documented cases of lamps being damaged in gymnasiums by balls striking the lamps, resulting in sun burns and eye inflammation from shortwave ultraviolet radiation. If they use a starting electrode, there is always a thermal shorting switch to eliminate any electrical potential between the main electrode and the starting electrode once the lamp is lit. United States Patent 4156826 . They are enclosed and have protections to prevent human exposure as well as specialised exhaust systems to remove the ozone generated. Some mercury vapor lamps (including metal halide lamps) must contain a feature (or be installed in a fixture that contains a feature) that prevents ultraviolet radiation from escaping. Mercury vapor lamps are becoming obsolete due to the higher efficiency and better color balance of metal halide lamps. USHIO Germicidal lamps are Low-Pressure Mercury-Arc lamps that emit radiation peaking at 253.7nm (UV-C). Additional drawings are not available for this product. There is also an increase in red color (e.g., due to the continuous radiation) in ultra-high-pressure mercury vapor lamps (usually greater than 200 atm. 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. It needs to be vaporized and ionized before the lamp can produce its full light output. These lamps provide intense radiation corresponding to the photo-sensitivity of most presently available photoresist materials. They give light immediately on startup, but usually need a few minutes to restrike if power has been interrupted. An arc initiates between the two main electrodes and the lamp will then radiate[8] mainly in the ultraviolet, violet and blue emission lines. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. These are typically high powered to rapidly cure and set the inks used. by interruption of the electric supply), it is not possible for the lamp to restrike until the bulb cools enough for the pressure to fall considerably. Abstract: A mercury arc lamp envelope is made of high purity synthetic fused silica which contains total metallic impurities of less than one part per million by weight and OH radical content of less than five parts per million by weight. The mercury in the tube is a liquid at normal temperatures. 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 light produces, and a convenient mounting for the fused quartz arc tube. [7] In 1903, Hewitt created an improved version that possessed higher color qualities which eventually found widespread industrial use. 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