The role of top light：

A. When the lamp lights into the stage, its function is the same as the surface light;

B. When the lamp is lighting vertically to the table, it is used as the vertical coloring of the space (multiple colors or single color), large-area coloring, and the light hits the object with little shadow and the best effect;

C. When the lamp is illuminated outside the stage (backlight), it will produce a strong contour effect, showing the brightness and color of the space-light curtain.