Sodium Vapour Lamp

Sodium Vapour Lamp Sodium Vapour Lamp consists of a discharge tube made from a heat resistant glass, containing a small amount of metallic sodium, neon gas and two electrodes, Neon gas is added to start the discharge and to develop enough heat to vaporize... More

Sodium Vapour Lamp Sodium Vapour Lamp consists of a discharge tube made from a heat resistant glass, containing a small amount of metallic sodium, neon gas and two electrodes, Neon gas is added to start the discharge and to develop enough heat to vaporize the sodium. Because of law pressure inside the tube, a sufficiently long tube required to obtain more light.To reduce the overall dimension of the lamp, this tube is generally bent into Ushape. The light produced by this lamp is yellowish which is produced at its optimum pressure of about 0.004mm of mercury. This pressure is obtained at a temperature of about 280° C and so itbecomes necessary to maintain this temperature. For this purpose the Utube is enclosed in a double walled flask to prevent lose of heat. The double walled flask is interchangeable and can be fitted on to another U-tube. While replacing the inner Utube one must be very careful because if itis broken and sodium comes in contact with moisture, itmay result in fire. A Less