<P> This is a list of the longest lasting incandescent light bulbs . </P> <P> The world's longest lasting light bulb is the Centennial Light located at 4550 East Avenue, Livermore, California . It is maintained by the Livermore - Pleasanton Fire Department . The fire department claims that the bulb is at least 116 years old (installed 1901) and has only been turned off a handful of times . The bulb has been noted by The Guinness Book of World Records, Ripley's Believe It or Not!, and General Electric as being the world's longest - lasting light bulb . </P> <P> While it might seem astonishing that so many longest - lasting light bulbs have been so infrequently turned off, this is the precise reason for their longevity . Most of the wear and tear that leads to burnouts in incandescent light bulbs is caused by turning them on and off, not by burning them . Each time the bulb is turned on and off, the filament is heated and cooled . This causes the material of the filament to expand and contract, in turn causing micro stress cracks to develop . The more the light is turned on and off, the larger these cracks grow, until eventually the filament breaks at some point, in non-spectacular fashion, thus causing the light to burn out . Another reason for the longevity of bulbs is the size, quality and material of the filament . </P>

Where is the oldest light bulb that is still working