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
The Essential Electric Light Orchestra also rearranged the entire track order. This is the third ELO compilation that presents a chronological run-through of ELO's singles/songs. The original artwork has been slightly altered as well to differentiate from the single CD release. All tracks written by Jeff Lynne, except where noted. All tracks written by Jeff Lynne, except where noted. The Essential Electric Light Orchestra The Essential Electric Light Orchestra is a single CD, US-only compilation album by the Electric Light Orchestra (ELO), released in 2003. It is part of Sony Music's "The Essential" series. It was preceded by US compilations "Olé ELO" in 1976 and