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Sodium Vapour Lamp consists of a discharge tube created from a heat resistant glass, containing a small quantity of metallic sodium, neon gas and two electrodes, Neon gas is added to commence the discharge and to develop enough heat to vaporize the sodium. Simply because of law pressure inside the tube, a sufficiently long tube necessary to obtain a lot more light. To reduce the overall dimension of the lamp, this tube is typically bent into U-shape.

The light created by this lamp is yellowish which is created at its optimum pressure of about .004mm of mercury. This pressure is obtained at a temperature of about 280 C and so it becomes essential to preserve this temperature. For this purpose the U-tube is enclosed in a double walled flask to prevent company web site shed of heat. The double walled flask is interchangeable and can be fitted on to one more U-tube. Even though replacing the inner U-tube one particular need to be very careful simply because if it is broken and sodium comes in speak to with moisture, it may result in fire.

All electric discharge lamps require chickens coops 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 look into chicken house for sale transformer. At beginning a high voltage of about 450 volts is applied across the lamp which is enough to begin the discharge. When the lamp is completely operative immediately after 10 - 15 minutes, the voltage across it falls to about 150 volts. Since of the high reactance of circuit, the power aspect is low and hence 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 obtaining yellow color. Sodium lamps are mainly employed for street, high way and airfield lighting where color distinction is not so required.