Over 110 years, Livermore's Centennial Light Bulb has come to be recognized as the world's longest-lasting light, beaming 24 hours a day. Its 4-watt output and hand-blown glass bulb cast a soft crimson glow from a filament about the width of a human hair.

First installed at the fire department hose cart house on L Street in 1901. Shortly after it moved to the main firehouse on Second. In 1903 it was moved to the new Station 1 on First and McLeod, and survived the renovation of the Firehouse in 1937, when it was off for about a week. During it's first 75 years it was connected directly to the 110 Volt city power, (subject to the power outage), and not to the back-up generator for fear of a power surge.In 1976 it was moved with a full police and fire truck escort, under the watch of Captain Kirby Slate, to its present site in 1976 at Fire Station 6, 4550 East Ave., Livermore, California. It was then hooked to a seperate power source at 120V according to Frank Maul, Retired City Electrician, with no interuptions since.

Its declared the oldest known working light-bulb by Guinness Book of World Records.