Sodium Vapour Lamp

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Sodium Vapour Lamp consists of a discharge tube produced from a heat resistant glass, containing a quality small chicken house little amount of metallic sodium, neon gas and two electrodes, Neon gas is added to begin the discharge and to develop enough heat to vaporize the sodium. Due to the fact TM of law pressure inside the tube, a sufficiently long tube needed to acquire far more light. To lessen the general dimension of the lamp, this tube is usually 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 essential to maintain 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 one more U-tube. Whilst replacing the inner U-tube 1 should be really cautious because if it is broken and sodium comes in get in touch with with moisture, it may result in fire.

All electric discharge lamps call for a higher voltage at the time of beginning and low voltage throughout operation. Typically, 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 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 issue is low and therefore a chicken coops backyard online 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 possessing yellow color. Sodium lamps are mostly employed for street, high way and airfield lighting where color distinction is not so needed.