Edison improved the incandescent lamp in 1879, but he didn't actually invent it. Sir Humphrey Davy is reputed to be the true inventor of the electric light. He passed electricity through a platinum wire and caused an arc lamp to glow as early as 1802. However, Davy did not pursue the discovery. By the time Edison entered the scene, arc lamps had been burning for several decades, but were limited by short life spans. Edison developed a long-lasting filament light in 1877, and in 1879 produced the first long-lasting light bulb.
