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| − | Sodium Vapour Lamp consists of a discharge tube made from a heat resistant glass, containing a modest quantity of metallic sodium, neon [http://www.chickencoopselect.com/ research chicken coop for sale] gas and two electrodes, Neon gas is added to start the discharge and to develop sufficient heat to vaporize the sodium. Since of law pressure inside the tube, a sufficiently extended tube essential to acquire a lot more light. To minimize the general dimension of the lamp, this tube is typically bent into U-shape.<br><br>The light created 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 needed to preserve 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 an additional U-tube. While replacing the inner U-tube a single must be quite careful since if it is broken and sodium comes in speak to with moisture, it may result in fire.<br><br>All electric discharge lamps require [http://www.chickencoopselect.com/chicken-tractors found it] a larger voltage at the time of starting and low voltage for the duration of operation. Typically, sodium vapour lamps are operated by a high leakage reactance transformer. At starting a [http://www.chickencoopselect.com/ visit free chicken coops] high voltage of about 450 volts is applied across the lamp which is enough to begin the discharge. When the lamp is fully operative after 10 - 15 minutes, the voltage across it falls to about 150 volts. Because of the high reactance of circuit, the power element is low and therefore a p.f improvement capacitor is connected.<br><br>The efficiency of a low pressure sodium vapour lamp is quite high (about 40 - 50 lumens/watt) and it produces a light of distinct wavelength having yellow color. Sodium lamps are mostly employed for street, high way and airfield lighting where color distinction is not so essential.
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Текущая версия на 11:44, 26 декабря 2025
