A neon lamp is a type of gas discharge lamp. They are filled with a gas at low pressure, and an electric current passed through the gas causes it to glow. Neon lamps were one of the first types of gas discharge lamps and they remain popular for some applications.
The most common gas used in neon lamps is neon, although other gases can be used. When the electric current is applied, the neon atoms become excited and emit light. The color of the light depends on the gas used. Neon lamps are used in a variety of applications, including signs, aviation lighting, and high-voltage indicators.
Neon lamps have a few disadvantages. They can be fragile, and the glass envelope can break if the lamp is dropped. They also require a high voltage to operate, which can be a safety hazard.