The Centennial Light is the world’s longest-lasting light bulb. It is at 4550 East Avenue, Livermore, California, and maintained by the Livermore-Pleasanton Fire Department.[1] The fire department says that the bulb is at least 113 years old and has been turned off only a handful of times. Due to its longevity, the bulb has been noted by The Guinness Book of World Records,[2] Ripley’s Believe It or Not!, and General Electric.[3] It is often cited as evidence for the existence of planned obsolescence in later-produced light bulbs.[4]