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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 vapor lamps are metal vapor lamps based on light emission from sodium (Na) atoms, sometimes with additional emission e.g. from mercury. They largely exploit the characteristic orange 589-nm D-line of sodium atoms, which has also been extensively studied in physics.
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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. When current passes between the electrodes, it ionizes the neon and argon, giving a red glow until the hot gas vaporizes the sodium.
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The Light Emitted The currents encompassed by a sodium vapor lamp creates light at the most sensitive color frequency to the human eye. It is seen as a monochromatic yellow hue, but this restricts the bulbs' purposes to night lighting.
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Nowadays, high-pressure sodium (HPS) lamps are widespread in outdoor illumination, where they replaced most of the high-pressure mercury-vapor lamps in Europe, due to their high-energy efficiency. A typical 70 W HPS lamp (see Fig. 1. ) has an energy efficacy of around 90 lm/W. Highest efficacies possible go up to 150 lm/W.
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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. History of HPS Lamps. General lighting engineers.
What is a Sodium Vapour Lamp?
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Principally the sodium vapour discharge lamp consists of a bulb containing a small amount of metallic sodium, neon gas, and two sets of electrodes connected to a pin type base. The presence of neon gas serves to start the discharge and to develop enough heat to vaporize the sodium.
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A gas-discharge lamp that uses sodium (Na) in an exciting condition to produce light at a 589 nm wavelength is known as a sodium vapor lamp. Philips introduced the first commercially available sodium lamps in 1932 in Holland. Sodium-Vapor-Lamps
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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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The sodium vapour lamp is similar in construction to the mercury vapour lamp. The two electrodes (E 1, and E 2) are mounted in a glass tube or bulb (G 1 ) containing sodium along with a small quantity of neon or argon.
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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 sodium vapor lamp is type of gas-discharge lamp that uses sodium (Na) in an exciting condition to produce light of thick blue color. The first sodium vapor lamp was commercially designed by Philips in 1932 in Holland. Circuit Diagram of Sodium Vapor Lamp The circuit diagram and the construction of a sodium vapor lamp is shown in the figure below.
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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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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.