Exactly when the 60-watt bulb was manufactured and the year it was first turned on are a bit unclear, but according to Guinness World Records, the so-called Centennial Light is the longest-burning ...

Many manufacturers say that their bulbs can last up to 50,000 hours — up to 50 times the lifespan of an incandescent bulb and about five times as long as CFL bulbs. Unfortunately, your bulbs may ...