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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 −3. In its short history - the sodium-resistant translucent alumina used as the discharge tube material was invented only in the late.
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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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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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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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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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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.
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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 × 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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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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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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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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High pressure sodium lights are widely used in industrial lighting. Filter Ceramalux ALTO Non-Cycling 3 products Family leaflet Ceramalux Non-ALTO 5 products Family leaflet Ceramalux Instant Restrike 4 products Family leaflet MASTER SON PIA Plus 1 product Family leaflet Ceramalux ALTO 7 products Family leaflet
