... yyy-zzz-DxL 5 CE Kr lamp Kr Lamp produce light by an electric arc (also called a voltaic arc). The ... typically made today of tungsten, which are separated by a gas. The type of lamp is often named ... by the gas contained in the bulb; including neon, argon, ... xenon, krypton, sodium, metal halide, and mercury, or by the type of electrode as in carbon-arc lamps. It ...