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Sodium Vapour Lamp consists of a discharge tube made from a heat resistant glass, containing a modest amount of metallic sodium, neon follow us on twitter gas and two electrodes, Neon gas is added to start off the discharge and to create enough heat to vaporize the sodium. Simply because of law pressure inside the tube, a sufficiently long tube necessary to acquire much more light. To decrease the overall dimension of the lamp, this tube is generally bent into U-shape.

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 essential to sustain this temperature. For this purpose the U-tube is enclosed in a double walled flask to avoid shed of heat. The double walled flask is interchangeable and can be fitted on to an additional U-tube. Even though replacing the chicken coop tractor inner U-tube 1 need to be quite careful due to the fact if it is broken and sodium comes in contact with moisture, it could tell us what you think result in fire.

All electric discharge lamps call for a greater voltage at the time of starting and low voltage for the duration of operation. Generally, sodium vapour lamps are operated by a high leakage reactance transformer. At starting a high voltage of about 450 volts is applied across the lamp which is adequate to start off the discharge. When the lamp is fully operative right after ten - 15 minutes, the voltage across it falls to about 150 volts. Due to the fact of the high reactance of circuit, the power factor is low and hence a p.f improvement capacitor is connected.

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