Worlds longest lasting light bulb?

Probably a LED bulb, because it has no wear-out components.

For example, a tungsten bulb filament gets thinner and thinner because tungsten sublimes off the filament and plates out on the glass envelope. CFL bulbs have hot cathodes with the same problem.

LED bulbs only fail due to manufacturing defect or misuse.

Answer:
The current holder for longest lasting bulbs is The world's longest lasting light bulb is the Centennial Light located at 4550 East Avenue, Livermore Clifornia. Its claimed that the bulb is at least 110 years old