Sodium Vapour Lamp Working Principle
Sodium vapor lamps are some of the most efficient lamps in the world. They have an efficiency of up to 190 lumens per watt compared to an incandescent street lamp which has between 15 and 19.
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High pressure sodium vapor (HPS) lights, similar to LPS lights, are a specific type of gas- discharge light (also known as a high intensity discharge, HID or arc light). The principal difference between low and high pressure sodium lights is the operating pressure inside the lamp.
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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.
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The Sodium Lamp - How it works and history Sodium Lamp High lumen output at high efficiency (1920 - Today) Sodium Lamps were first produced commercially by Philips in Holland in 1932. There are two kinds of sodium lights: Low Pressure (LPS) and High Pressure (HPS). These lamps are mostly used for street lighting as well as industrial uses.
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Sodium gas discharge lamps can be distinguished in two main groups: low-pressure sodium lamps in which the gas pressure is very low (0.7 Pa or 7.10 6 atm) and high-pressure sodium lamps in which the gas pressure is a factor 10,000-100,000 times higher (10 -100 kPa); [2 -4].
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sodium-vapour lamp, electric discharge lamp using ionized sodium, used for street lighting and other illumination. A low-pressure sodium-vapour (LPS) lamp contains an inner discharge tube made of borosilicate glass that is fitted with metal electrodes and filled with neon and argon gas and a little metallic sodium.
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Dimensions: 3.5 ร 3.5 ร 16.8 cm. This lamp has a discharge tube which vaporises sodium under low pressure, and produces light with a yellow tinge, characteristic of the sodium ion. The tube is operated from the AC mains through a ballast (inductor) to limit the current drawn.
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Hollo S (1997) High-pressure sodium discharge lamps. In: Coaton JR, Marsden AM (eds) Lamps and lighting, 4th edn. Routledge, New York, pp 235-248 Jack AG, Koedam M (1974) Energy balances for some high pressure gas discharge lamps. J IES, Annual IES conference. Light Division, N.V. Philips' Gloeilampenfrabrieken, Eindhoven, pp 323-329
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A gas-discharge lamp that uses sodium (Na) in an exciting condition to generate light at a 589 nm of characteristic wavelength is known as a sodium vapor lamp. These lamps were commercially designed first sodium lamps by Philips in the year 1932, Holland.
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What is a High Pressure Sodium Lamp? A high-pressure sodium lamp is a specialized gas discharge lamp containing sodium metal vapor operating at high pressures that produces light by the excitation of sodium ions. They provide high luminous efficacy and long life, making them suitable for street lighting, floodlighting, etc.
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Gas-discharge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a plasma . Typically, such lamps use a noble gas ( argon, neon, krypton, and xenon) or a mixture of these gases.
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Sodium gas discharge lamps can be distinguished in two main groups: low-pressure sodium lamps in which the gas pressure is very low (0.7 Pa or 7.10 โ6 atm) and high-pressure sodium lamps in which the gas pressure is a factor 10,000-100,000 times higher (10-100 kPa); [ 2 - 4 ].
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When the sodium vapor lamp is turned on, it sends an electric discharge within the neon gas which generates sufficient heat to evaporate the solid sodium. In case, when the sodium vapor lamp is not operated, the sodium remains deposited on the side walls of the tube in solid condition.
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High-pressure sodium discharge lamps. The review article deals with the high-pressure sodium (HPS) discharge lamp, characterised by a sodium vapour pressure above 5 kPa and a power density of about 100 Wcm โ3. In its short history - the sodium-resistant translucent alumina used as the discharge tube material was invented only in the late.