neon tubes

Neon tubes are glass cylinders filled with noble gases, like neon, and coated internally with phosphor. When an electric current passes through, it excites the gas atoms, causing them to emit bright, colorful light—most famously red for neon. Different gases and coatings produce various colors. These tubes are used in signage and decorative lighting due to their vibrant glow, durability, and efficiency. The process involves plasma formation inside the sealed tube, with electricity stimulating the gas atoms to emit visible light without heat.