Construction of Mercury Vapor Lamp

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Construction of Mercury Vapor Lamp

The construction and circuit for a mercury vapor lamp is shown in the figure below.

  • It consists of an inner tube containing mercury vapor and it is made of hard glass.

  • It also has an outer glass cover which protects the inner tube from coming in direct contact with the atmospheric temperature variations and also absorbs the UV rays emitted by the lamp during operation.

  • The inner tube has a percentage of argon gas.

  • The lamp has two main electrodes viz. main electrode 1 & 2, which are made of tungsten wire and an auxiliary (or starting) electrode which is spaced very close to one of the main electrodes.

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