Sodium Vapour Lamp Working Principle
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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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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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.
Sodium Vapour Lamp Working Principle
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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In order to get the electric discharge started, the lamp housing needs to contain a small amount of a starter gas, typically neon and/or argon, in addition to the sodium. The discharge can then be initiated in that gas, and the resulting temperature rise leads to evaporation of the sodium. It takes a couple of minutes until the lamp can reach.
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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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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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What Is a Sodium Vapor Lamp The low-pressure sodium vapor lamp gives off yellow light at the same wavelength 5980°A. The efficiency of a sodium vapor lamp is 50 lumen/watt. This lamp has a discharge tube made of a special composition of glass that can withstand high temperatures (300°C) of electrical discharge.
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Dimensions: 3.5 × 3.5 × 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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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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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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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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Working of Sodium Vapour Lamp. The lamp requires high voltage at the time of starting i.e. switching on, which is obtained from the high leakage transformer. The discharge takes place through the neon gas and is of pink colour. The gas is heated up and sodium is vaporised. A yellowish light is produced when sodium vapours also takes part.
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A low-pressure sodium lamp is shown in Figure 6.3.9. Even though they emit a yellow light, a low-pressure sodium lamp should NOT be confused with a standard high-pressure sodium lamp, which is a high-intensity discharge lamp. Figure 6.3.9. Low-pressure sodium lamp. Low-pressure sodium lamps operate much like fluorescent lamps and require ballast.
