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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 off the discharge and to create enough heat to vaporize the sodium. Simply because of law pressure inside the tube, a sufficiently lengthy tube necessary to obtain a lot more light. To reduce the all round dimension of the lamp, this tube is usually bent into U-shape.

The light produced 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 sustain this temperature. For this purpose the U-tube is enclosed in a double walled flask to avert lose of heat. The double walled flask is interchangeable and can be fitted on to an additional U-tube. Even though replacing the inner U-tube one particular must be quite careful simply because if it is broken and sodium comes in get in touch with with moisture, it could outcome in fire.

All electric discharge lamps demand a greater voltage at the time of beginning and low voltage in the course of operation. Usually, 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 enough to start off the discharge. When the lamp is totally operative following ten - 15 minutes, the voltage across it falls to about 150 volts. Due to the fact of the high reactance of circuit, the energy element 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 particular wavelength getting yellow color. Sodium lamps are mostly employed for street, high way and airfield lighting where color distinction is not so necessary. wholesale electric cigarette review continue reading visit my website