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| − | Sodium Vapour Lamp consists of a discharge tube created from a heat resistant glass, containing a modest quantity of metallic sodium, neon gas and two electrodes, Neon gas is added to commence the discharge and to develop sufficient heat to vaporize the sodium. Since of law pressure inside the tube, a sufficiently lengthy tube needed to obtain much more light. To reduce the overall dimension of the lamp, this tube is normally bent into U-shape.<br><br>The light produced by this lamp is yellowish which is made at its optimum pressure of about .004mm of mercury. This pressure is obtained at a temperature of about 280 C and so it becomes required to sustain this temperature. For this goal the U-tube is enclosed in a double walled flask to stop shed of heat. The double walled flask is interchangeable and can be fitted on to another U-tube. Whilst replacing the inner U-tube a single [http://www.chickencoopselect.com/chicken-tractors movable chicken coop talk] must be quite careful due to the fact if it is broken and sodium comes in speak to with moisture, it might result in fire.<br><br>All electric discharge lamps [http://www.chickencoopselect.com/chicken-tractors quality urban chicken tractor] need a greater voltage at the time of beginning and low voltage during operation. Normally, sodium vapour lamps are operated by a high leakage reactance transformer. At beginning a high voltage of about 450 volts is applied across the lamp which is enough to start the discharge. When the lamp is fully operative after 10 - 15 minutes, the voltage across it falls to about 150 volts. Since of the high reactance of circuit, the power issue is low and therefore a p.f improvement [http://www.chickencoopselect.com/chicken-tractors www] capacitor is connected.<br><br>The efficiency of a low pressure sodium vapour lamp is really high (about 40 - 50 lumens/watt) and it produces a light of particular wavelength obtaining yellow color. Sodium lamps are primarily employed for street, high way and airfield lighting where color distinction is not so required.
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Текущая версия на 11:44, 26 декабря 2025
