lighting facts

did you know that the world's longest-lasting light bulb is the centennial; it’s at least 114 years old. the improved incandescent lamp, invented by adolphe a. chaillet, is a hand-blown bulb with carbon filament. it is at california, at the livermore-pleasanton fire department. due to its longevity, the bulb has been noted by the guinness book world records. it is often cited as evidence for the existence of planned obsolescence in later-produced light bulbs.