• Usually Argon, though some smaller (flashlight, usually) bulbs use Krypton or Xenon.
  • "Low pressure inert gas (argon, neon, nitrogen)" "General service incandescent light bulbs over about 25 watts in rating are now filled with a mixture of mostly argon and some nitrogen, or sometimes krypton. Xenon gas, much more expensive, is used occasionally in small bulbs, such as those for flashlights. Since a filament breaking in a gas-filled bulb can form an electric arc which may spread between the terminals and draw very heavy current, intentionally thin lead-in wires or more elaborate protection devices are therefore often used as fuses built into the light bulb. More nitrogen is used in higher-voltage lamps to reduce the possibility of arcing." Source and further information:

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