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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 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.

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.

All electric discharge lamps require 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 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.

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.