Arc lamp

Patent Granted An arc lamp or arc light is a lamp that produces light by an electric arc (also called a voltaic arc). The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the early 1800s, was the first practical electric light.[1] It was widely used starting in the 1870s for street and large building lighting until it was superseded by the incandescent light in the early 20th century.