The Centennial Light bulb in California has been on for 122 years.

The light bulb in the number 6 fire station in Livermore, California, USA, has been burning almost continuously since 1901.
The century-old lamp, known as "The Centennial Light", has the title of the world's longest burning bulb.
The eight-centimetre centennial lamp, which was made manually by Shelby Electric Company founder Adolphe Chaillet in the 1890s, has not gone out almost since 1901.