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.

Spray a mixture of alcohol and ketone soluble fluorescent powder onto the inner wall of the lamp tube with water, allowing it to dry naturally. Glue coating involves spraying a mixture of glue and fluorescent powder, and then drying it in an oven. Its viscosity and fastness are greatly superior to those of water coated powder tubes. Most advanced countries use three primary colors of lead coated glass tubes to produce neon lights, and some manufacturers in China have already used this type of neon tube.