Sodium Vapour Lamp: Unterschied zwischen den Versionen

Version vom 9. Juli 2012, 04:36 Uhr

Sodium Vapour Lamp consists of a discharge tube produced from a heat resistant glass, containing a modest amount of metallic sodium, neon gas and two electrodes, Neon gas is added to begin the discharge and to create enough heat to vaporize the sodium. mobile chicken coop Since of law pressure inside click for chicken coop the tube, a sufficiently extended tube essential to acquire much more light. To lessen the overall dimension of the lamp, this tube is generally 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 preserve this temperature. For this purpose 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. Although replacing the inner U-tube one should be very cautious since if it is broken and sodium comes in get in touch with with moisture, it could outcome in fire.

All electric discharge lamps need a larger voltage at the time of starting and low voltage during 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 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 power aspect 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 possessing yellow color. Sodium lamps are primarily portable chicken run employed for street, high way and airfield lighting exactly where color distinction is not so necessary.