The lifespan on incandescent isn’t a conspiracy. Cheap bright incandescents don’t last very long. The centennial light was neither cheap or bright - presently

The lifespan on incandescent isn’t a conspiracy. Cheap bright incandescents don’t last very long. The centennial light was neither cheap or bright - presently it’s about the strength of a 4-watt nightlight. You put enough power through a thick filament it will glow for a very very long time, but no one wants to illuminate their house that way!