Why bulbs fail

March 8, 2016

  • 99.9% of early bulb failures in aftermarket applications are not the fault of the bulb itself. 
  • Failure can be due to several factors, including:
    • Voltage surges in the vehicle that are larger than the filament is designed to handle (over-voltage).
    • If the bulb receives an impact or jolt while hot, it can cause direct damage to the bulb.
  • Bulbs do experience end of life failure – heating and cooling cycles cause the coils of the filament to become pitted and eventually break in two.
  • Dropping the bulb can cause the filament to break or result in early bulb failure. 
  • Dropping can crack the bulb and cause the gas fill mixture to leak out. This is evident by a white color in the glass (fast leak) or black color in the glass (slow leak). 

filament-failures

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