Electric light be made with a screw-thread base, two metal pins, two metal caps or a bayonet cap. The three main categories of electric lights are incandescent lamps, which produce light by a filament heated white-hot by electric current, gas-discharge lamps, which produce light by means of an electric arc through a gas, and LED lamps, which produce light by a flow of electrons across a band gap in a semiconductor. Before electric lighting became common in the early 20th century, people used candles, gas lights, oil lamps, and fires. Cornish chemist Humphry Davy developed the first incandescent light in 1802, followed
Light Years, The Very Best of Electric Light Orchestra but was withdrawn. Although not in chronological order, it is however the most comprehensive assemblage of the band's hits of the many compilations available. The album reached 60 in the UK Album Charts. The album was also released in Europe with an identical track order under the titles, The Swedish Collection and The Danish Collection. Light Years, The Very Best of Electric Light Orchestra Light Years, The Very Best of Electric Light Orchestra is a two CD compilation album by Electric Light Orchestra (ELO). The album celebrates the band's 25th Anniversary singles career starting in 1972 and contains all of