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Nitrogen or argon is filled in GLS lamps to

  • Nitrogen or argon is filled in GLS lamps to Retard evaporation of tungsten filament.
  • When an electric current passes through the filament of a GLS lamp, the filament heats up, causing it to emit light.
  • At high temperatures, the tungsten in the filament can start to evaporate, which can cause the filament to weaken and eventually break.
  • This process is called evaporation, and it can lead to a decrease in the lifetime of the lamp.
  • By filling the space inside the bulb with an inert gas such as argon or nitrogen, the evaporation of the tungsten filament is slowed down.
  • The gas molecules act as a barrier between the filament and the glass envelope, reducing the amount of tungsten that is able to escape from the filament.