Limelight is a type of stage lighting once use in theatres and music halls. An intense illumination is created when an oxyhydrogen flame is directed at a cylinder of calcium oxide, which can be raised to white heat without melting. The light is produced by a combination of incandescence and candoluminescence. Although it has long since been replaced by electric lighting, the term has nonetheless survived, as someone in the public eye is still said to be "in the limelight".