JanessaHollaway169

2012-08-23T08:20:33Z

JanessaHollaway169: Created page with 'Sodium Vapour Lamp consists of a discharge tube produced from a heat resistant glass, containing a tiny quantity of metallic sodium, neon gas and two electrodes, Neon gas is adde…'

Sodium Vapour Lamp consists of a discharge tube produced from a heat resistant glass, containing a tiny quantity 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. Because of law pressure inside the tube, a sufficiently lengthy tube needed to obtain more light. To lessen the all round dimension of the lamp, this tube is normally bent into U-shape.

The light developed 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 needed to preserve this temperature. For this objective 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 an additional U-tube. While replacing the inner U-tube one particular need to be very careful due to the fact if it is broken and sodium comes in get in touch with with moisture, it might result in fire.

All electric discharge lamps require a greater voltage at the time of beginning and low voltage for the duration of operation. Normally, 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 adequate to commence the discharge. When the lamp is completely operative following 10 - 15 minutes, the voltage across it falls to about 150 volts. Due to the fact of the high reactance of circuit, the power element is low and therefore a p.f improvement capacitor is connected.

The efficiency of a low pressure sodium vapour lamp is very high (about 40 - 50 lumens/watt) and it produces a light of specific wavelength obtaining yellow color. Sodium lamps are mainly employed for street, high way and airfield lighting exactly where color distinction is not so required. [http://water-vaporcigarette.com/ the guide to vapor cigarette] [http://water-vaporcigarette.com/ consumers] [http://newelectroniccigarettereview.com/ electric cigarette brands website]

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