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Sodium Vapour Lamp consists of a discharge tube created from a heat resistant glass, containing a tiny amount of metallic sodium, neon gas and two electrodes, Neon gas is added to commence the discharge and to create sufficient heat to vaporize the sodium. Due to the fact of law pressure inside the tube, a sufficiently extended tube necessary to acquire far more light. To minimize the all round dimension of the lamp, this tube is usually 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 maintain this temperature. For this goal the U-tube is enclosed in a double walled flask to stop lose 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 a single should be really careful simply because if it is broken and sodium comes in contact with moisture, it may outcome in fire.
All electric discharge lamps require a larger voltage at the time of starting and low voltage during 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 sufficient to begin the discharge. When the lamp is completely operative following 10 - 15 minutes, the voltage across it falls to about 150 volts. Simply because of the high reactance of circuit, the power factor is low and hence a p.f improvement capacitor is connected.
The effectiveness of a low pressure sodium vapour lamp is very high (about 40 - 50 lumens/watt) and it produces a light of distinct wavelength obtaining yellow color. Sodium lamps are primarily employed for street, high way and airfield lighting exactly where color distinction is not so required. For more information, please go to: <a href="http://owuwug.wordpress.com/">electronic cigarette</a>v2 cigs, v2 cigs For more, please go to: <a href="http://aaronrhunter.multiply.com/">electronic cigarette</a>v2 cigs, v2 cigs To check out more, please go to: <a href="http://bresslykerug.posterous.com/">electronic cigarette</a>v2 cigs, v2 cigs
