Noble gas lamps are lighting devices that use noble gases, such as neon, argon, or krypton, to produce light. When an electric current passes through these gases, they emit a bright glow. Each type of noble gas produces a different color; for example, neon gives off a reddish-orange light, while argon can create a blue hue. These lamps are commonly used in signs and decorative lighting due to their vibrant colors and energy efficiency. They are often found in neon signs and can be shaped into various designs, making them popular for both commercial and artistic applications.