sodium vapor lamp consists of an exhaust pipe from a heat resistant glass, containing a small quantity of metallic sodium, neon gas and two electrodes, the neon gas, the discharge start and sodium develop enough heat to evaporate. The pressure inside the pipe case, a tube of sufficient length necessary to obtain more light. To reduce the total length of the tube lamp that is usually U-shaped bent
The light produced by this> Lamp is yellow, which generates at its optimum pressure at 0.004 mm of mercury. This pressure is produced at a temperature of about 280 ° C and is necessary to maintain this temperature. To this end, even the U-tube into a container with double wall is to prevent heat loss. The double cylinder is interchangeable and can be mounted to another U-tube When replacing the inner U-tube must be very careful, because if it is broken and the ash is in contacthumidity, can cause a fire.
All discharge lamps require a higher voltage to the start time and low voltage during operation. In general, sodium vapor lamps powered by a high reactance transformer losses. At the beginning of a high voltage of 450 volts is applied across the discharge lamp, sufficient to be started. When the lamp is fully operational after 10-15 minutes, the voltage drops to about 150 volts. Due to the highReactance of the circuit is the power factor is lower, and then a pf improvement capacitor is connected.
The efficiency of a sodium vapor lamp low pressure is very high (about 40-50 lumens per watt) and produces a specific wavelength of light with a yellow color. Sodium lamps are mainly for roads, airfield lighting and high distinction, where color is not used as required.
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