There is an lightbulb that is in a service since year 1901!
The Livermore Centennial Light Bulb, at Firestation #6, Livermore, California, USA, has been burning since it was installed in 1901. As of 2010, the hand-blown bulb has operated at about 4 watts, and has been left on 24 hours a day in order to provide night illumination of the fire engines. There has only been one break in its operation when it was removed from one fire station and fitted in another.
And its official since it is noted in Guiness World Records as "Longest burning light bulb"
You can check on the webcam Centennial Light Bulb status
Must seen documentary on planned obsolescence theme.