Moire fringes appear on the lighting equipment.

Light is generated when it passes through a mask or is blocked.

When the light passes through the mask or is blocked, a wave pattern, called moire fringe, will be formed on the mask or irradiation surface.

They are caused by the molar effect. Moore effect is a special optical phenomenon, which is a visual effect produced by the interference of two lines or two objects at a fixed angle and frequency. These interference patterns can be seen when the human eye cannot distinguish between these two lines or two objects. Moire fringe is very common in some fine-grained situations, such as cloth in photography, which will be displayed by brightness or color.