Sodium Vapour Lamp: Unterschied zwischen den Versionen
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| − | Sodium Vapour Lamp consists of a discharge tube produced from a heat resistant glass, containing a | + | 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 start the discharge and to develop sufficient heat to vaporize the sodium. Because of law pressure inside the tube, a sufficiently long tube required to obtain a lot more light. To minimize the general dimension of the lamp, this tube is usually bent into U-shape.<br><br>The light made 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 sustain 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. Although replacing the inner U-tube 1 have to be extremely cautious since if it is broken and sodium comes in get in touch with with moisture, it may possibly result in fire.<br><br>All electric discharge lamps call for a higher voltage at the time of beginning and low voltage during operation. Typically, sodium vapour lamps are operated by a high leakage reactance transformer. At starting a high voltage of about 450 volts is applied across [http://www.chickencoopselect.com/ remove frames] the lamp which is enough to start off the discharge. When the lamp is totally operative following ten [http://www.chickencoopselect.com/ go here] - 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.<br><br>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 obtaining yellow color. Sodium lamps are primarily employed for street, high way and [http://www.chickencoopselect.com/ read about chicken coop] airfield lighting exactly where color distinction is not so needed. |
Version vom 31. Juli 2012, 03:38 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 start the discharge and to develop sufficient heat to vaporize the sodium. Because of law pressure inside the tube, a sufficiently long tube required to obtain a lot more light. To minimize the general dimension of the lamp, this tube is usually bent into U-shape.
The light made 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 sustain 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. Although replacing the inner U-tube 1 have to be extremely cautious since if it is broken and sodium comes in get in touch with with moisture, it may possibly result in fire.
All electric discharge lamps call for a higher voltage at the time of beginning and low voltage during operation. Typically, sodium vapour lamps are operated by a high leakage reactance transformer. At starting a high voltage of about 450 volts is applied across remove frames the lamp which is enough to start off the discharge. When the lamp is totally operative following ten go here - 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 efficiency of a low pressure sodium vapour lamp is quite high (about 40 - 50 lumens/watt) and it produces a light of particular wavelength obtaining yellow color. Sodium lamps are primarily employed for street, high way and read about chicken coop airfield lighting exactly where color distinction is not so needed.
