Neon lights are brightly emitting, electrically charged glass tubes or bulbs filled with thin neon gas or other rare gases, and are a type of cold cathode gas discharge lamp. A neon light tube is a sealed glass tube with electrodes at both ends, which is filled with some low-pressure gas. A voltage of several thousand volts is applied to the electrode, and the gas in the ionization tube emits light. The color of light depends on the gas in the tube.

According to the materials used for coating fluorescent powder inside neon tubes: ① Most of the neon tubes used are sprayed with "ordinary fluorescent powder", which is relatively cheap and can generally meet the requirements of various colors. ② The "three primary colors" fluorescent powder, also known as rare earth fluorescent powder, has better brightness, chromaticity, and freshness compared to ordinary fluorescent powder.