The distance between the lamp tube and the lamp piece is generally 20 cm, and a layer of ivory acrylic board is generally fixed between the lamp piece and the lamp tube to achieve the function of diverging light.

There are two kinds of acrylic boards: milky white and china white. When the light is not turned on, china white wool is transparent, slightly blue, and has good light transmittance. The milky white plate is pure white, with uniform astigmatism, but slightly less light transmission.