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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 gas and two electrodes, Neon gas is added to start the discharge and to create adequate heat to vaporize the sodium. Due to the fact of law pressure inside the tube, a sufficiently lengthy tube required to acquire far more light. To minimize the general dimension of the lamp, this tube is usually bent into U-shape.

The light created by this lamp is yellowish which is produced 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 retain this temperature. For this goal the U-tube is enclosed in a double walled flask to avoid lose of heat. The double walled flask is interchangeable and can be fitted on to an additional U-tube. While quality chicken coups replacing the inner U-tube one particular need to be very cautious because if it is broken and sodium comes in make contact with with moisture, it may possibly result in fire.

All electric discharge lamps require a higher voltage at the time of beginning and low voltage for the duration of operation. Generally, 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 adequate to start off the discharge. When the lamp is totally operative right after 10 - 15 minutes, the voltage across it falls to about 150 volts. Due to the fact of the high reactance of circuit, the power copyright aspect is low and therefore a p.f improvement mobile chicken coop capacitor is connected.

The efficiency of a low pressure sodium vapour lamp is extremely high (about 40 - 50 lumens/watt) and it produces a light of certain wavelength possessing yellow color. Sodium lamps are mainly employed for street, high way and airfield lighting where color distinction is not so required.