According to research by the National Association of Homebuilders, the average appliance lasts less than 15 years, although some have been around for much longer. As per the Guinness World Records, the Centennial Light Bulb in Livermore, California, was installed in 1901 and is the world's longest-burning light bulb. The Shelby Electric Company in Ohio created the hand-blown bulb in the late 1890s, and it was handed to the Livermore Fire Department in 1901. It was originally a 30-watt light, but since 2010, it has been running at about 4 watts. According to Guinness, it has been left on 24 hours a day at Fire Station #6 "to provide night illumination to the fire engines." It has rarely been switched off since its installation in 1901, has outlived every firefighter of the time, and has been named the ‘Eternal Light’ by General Electric engineers and scientists all around the world. The origins of the bulb, termed the Centennial Light, raises the question of whether it is a physics marvel or a hint that modern bulbs are weaker in make and design. Its long-term viability is still a mystery.