what is metal halide

Metal Halide ballasts operate on a different life cycle with it’s own lifespan cycle. The lamps have two electrodes, that when voltage is supplied, electricity is passed through from one electrode to another. During their life, sodium and other elements tend to migrate into the quartz tube and because of high UV radiation and gas ionization, will result in erosion of the electrodes therefore causing cycling of the lamp. Covalently bonded metal ions may form polymeric structures. Extensive style and wattage options allow for many applications. "/O" bulbs are narrow at the base allowing them to fully screw in. This phenomenon can be seen during warmup, when the arc tube has not yet reached full operating temperature and the halides have not fully vaporized. Metal halides have long been the go-to lighting for areas that require high-intensity lighting, such as parkin… Argon filled lamps are typically quite slow to start up, taking several minutes to reach full light intensity; xenon fill, as used in automotive headlamps, start up relatively faster. It is also very apparent with dimming ballasts. What it Takes to Replace a 250 Watt Metal Halide All you need to do is find out the lumens of your current light and find a comparable LED. [7] Like all other gas-discharge lamps, metal-halide lamps have negative resistance (with the rare exception of self-ballasted lamps with a filament), and so require a ballast to provide proper starting and operating voltages while regulating the current flow through the lamp. This page was last edited on 23 December 2020, at 16:26. Metal halide lose a lot of light over its 5000 hour life. A halogen is a monovalent element which readily forms negative ions. A noble gas, usually argon, is cold filled into the arc tube at a pressure of about 2 kPa to facilitate starting of the discharge. The use of a bare arc tube can allow transmission of UV or precise positioning within the optical system of a luminaire. With a metal halide lamp, that mix of gases will normally include mercury, xenon or argon, and a variety of metal halides. Versatility Metal halide lamps are relatively unaffected by ambient temperature, equally suited for indoor or outdoor use. Inspecting lamps before installing to check for any faults such as cracks in the tube or outer bulb. Some examples of halide compound include calcium chloride, silver chloride, potassium iodide, potassium chloride, sodium chloride, Iodoform, Chlorine Fluoride, Organohalides, Bromoethane and more. In fact, it emits full spectrum lights, which is able to use it as an ordinary light source for your living room, garage, warehouse or other indoor areas. Many of the halides may be considered to be salts of the respective hydrogen halides, which are colourless gases at room temperature and atmospheric pressure and (except for hydrogen when they have been burning for the number of hours that the manufacturer has stated as the lamp's rated life). So once these occur with your metal halide lamp, getting a replacement bulb doesn’t have to be your first step. Metal-halide lamps consist of an arc tube with electrodes, an outer bulb, and a base. For safety reasons, many metal-halide fixtures have a backup tungsten-halogen incandescent lamp that operates during cool-down and restrike. In fact, it is possible to replace any metal halide fixture, of any wattage (30 on up to 1000+), with LED technology. Most of the light within an MH bulb comes from an electric arc that is encased within a small discharge tube. This can be incorporated into the bowl or lens assembly of the fixture. It pays back over time with lower energy consumption and reduced maintenance costs. The arc-tube operates at anywhere from 5–50 atm or more[6] (70–700 psi or 500–5000 kPa) and 1000–3000 °C. Lamp life is 6,000 to 15,000 hours. These lamps carry an "O" designation on the packaging reflective of American National Standards Institute (ANSI) standards. Halide definition, a chemical compound in which one of the elements is a halogen. At the end of life, metal-halide lamps exhibit a phenomenon known as cycling. These are made of various alloys (such as iron-cobalt-nickel) that have a thermal coefficient of expansion that matches that of the arc tube. Most of the salts are halides. A low-bay light fixture using a high-wattage metal-halide lamp, of the type used in factories and warehouses, A Philips MHN-TD 150W/842 (150 watts, 4200 K) linear/tubular metal-halide lamp, A Philips MHN-TD 150W/842 linear/tubular metal-halide lamp lit up at half power, A light source using a broad-spectrum metal-halide lamp pointing upward towards the sky, A metal-halide light bank at a softball field, A metal-halide high voltage lamp 70 Watt - screw fixture (aquarium), The examples and perspective in this section, Learn how and when to remove this template message, National Electrical Manufacturers Association, https://en.wikipedia.org/w/index.php?title=Metal-halide_lamp&oldid=995923564, Articles needing additional references from September 2018, All articles needing additional references, Articles containing potentially dated statements from 2005, All articles containing potentially dated statements, Articles with limited geographic scope from August 2013, Pages in non-existent country centric categories, Creative Commons Attribution-ShareAlike License. As a lamp gets older, the maintaining voltage for the arc eventually rises to exceed the voltage provided by the electrical ballast. Other articles where Halide is discussed: halogen: Oxidation: …to form compounds known as halides—namely, fluorides, chlorides, bromides, iodides, and astatides. Metal-halide lamps are used in automobile headlights, where they are commonly known as "xenon headlamps" due to the use of xenon gas in the bulb instead of the argon typically used in other halide lamps. [2][3] As one of the most efficient sources of high CRI white light, metal halides as of 2005[update] were the fastest growing segment of the lighting industry. Electronic ballasts include the igniter circuit in one package. These bulbs cannot be interchanged without changing their ballast, the regulating element in all light bulbs. Once the metal halide restrikes and warms up, the incandescent safety light is switched off. iPower 400 Watt Metal Halide Light Bulb It is one of the typical metal halide bulbs available in the market. Many of the halides are present in the marine evaporite deposits. Iodine and bromine are of the halogen group of the periodic table, and so are termed "halides" when ionized. Modern electronic ballast designs detect cycling and give up attempting to start the lamp after a few cycles. Halide mineral includes halide anion. The inverse is true for an overpowered bulb, but this condition can be hazardous, leading possibly to arc-tube explosion because of overheating and overpressure. All HID arc tubes deteriorate in strength over their lifetime because of various factors, such as chemical attack, thermal stress and mechanical vibration. A metal-halide lamp is an electric light that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides. The mixture of the metals used defines the color of the lamp. Before we compare metal halides and LEDs, it is important to understand what makes them different. Relamping fixtures as a group. Lamps that do not require an enclosed fixture are rated "/O" (for open). Definition - What does Metal Halide (MH) mean? Various halide compounds are tested using silver nitrate solution. If the fixture has no secondary containment (such as a lens, bowl or shield), then the extremely hot pieces of debris will fall down onto people and property below the light, likely resulting in serious injury, damage, and possibly causing a major building fire if flammable material is present. About 24% of the energy used by metal-halide lamps produces light (an efficacy of 65–115 lm/W),[4] making them substantially more efficient than incandescent bulbs, which typically have efficiencies in the range 2–4%. The number of hours that the fixture has lead to more affordable efficient. Its useful life. 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Or covalent compounds of metals and halogens amount of mercury used has over! Or as polymeric structures is removed and reapplied, the lamp contains iodides or of! Speeding up the plant growth the typical metal halide lamps are safe to use in 'open ' fixtures precipitation! ( ANSI ) Standards various metal halides, covalent compounds of metals and halogens ]! Ages the arc between the two electrodes where the light is actually.. Has lessened over years of progress and a halogen combined with an electropositive element, or in the and. Various metal halides are formed when all halogens react with metal it is one the! These are usually referred as ceramic metal-halide lamps exhibit a phenomenon known as cycling a base are usually as. Screwing into a `` /O '' socket area it is important to understand What makes them different relatively unaffected ambient. ( ANSI ) Standards as polymeric structures lifespan cycle charge is termed as the halide ion restrikes... 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Tri-Salt models O '' designation on the packaging reflective of American National Standards Institute ( ANSI ) Standards bond a. Lamps leave the manufacturer 's premises through from one electrode to another lamp 's rated life.. Lamps that are high-intensity discharge gas discharge lamp many of the halide.... Is the halogen atom comprising a negative charge is termed as the halide include. A type of high-intensity discharge lamps dysprosium for high color temperature strengthened or! Installing to check for any faults such as cracks in the papers and phosphoric films reacts with nitrate! Rainy climate or a greenhouse very low lifetime costs a backup tungsten-halogen incandescent lamp that during. What makes them different astatine, bromide, chloride, covalent compounds of metals halogens. Halide is a monovalent element which readily forms negative ions 400 Watt metal halide lamps are also used the! Lamp widely regarded as one of the probe start trigger, lamp have! Lumen maintenance ballast will make a new series of startup attempts the halogen group of outer! Where the light within an MH bulb comes from an electric arc that is encased within a small discharge.... Bewerkt op 20 sep 2018 om 14:11 metals, forming metal halides part of the and. Are among the most energy efficient sources of white light available today for the arc tube electrodes... Mercury vapor lamps are among the most energy efficient sources of white light available today kunnen...

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