Super Fitness Health BlogSodium Vapour Lamp
Sodium Vapour Lamp consists of a discharge tube created from a heat resistant glass, containing a little amount of metallic sodium, neon gas and two electrodes, Neon gas is added to start off the discharge and to create adequate heat to vaporize the sodium. Because of law stress inside the tube, a sufficiently long tube needed to obtain a lot more light. To reduce the overall dimension of the lamp, this tube is typically bent into U-shape.
The light created by this lamp is yellowish which is created at its optimum stress of about .004mm of mercury. This stress is obtained at a temperature of about 280 C and so it becomes needed to maintain this temperature. For this objective 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. While replacing the inner U-tube a single need to be very cautious because if it is broken and sodium comes in contact with moisture, it might result in fire.
All electric discharge lamps require a larger voltage at the time of beginning and low voltage during operation. Usually, sodium vapour lamps are operated by a higher leakage reactance transformer. At starting a high voltage of about 450 volts is applied across the lamp which is enough to start the discharge. Identify further on our affiliated paper – Navigate to this website: igf1. When the lamp is fully operative after ten – 15 minutes, the voltage across it falls to about 150 volts. Because of the higher reactance of circuit, the energy element is low and therefore 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 possessing yellow color. Sodium lamps are primarily employed for street, high way and airfield lighting where colour distinction is not so essential.
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