What is the vertical light level?

Ceiling lamp, ceiling lamp, flat lamp, printing lamp. When taking pictures in light, its longitudinal light levels include top light, top light, flat light and printing light. The top light is the illumination light coming from above the subject, which forms an angle of about 90 with the scene and the camera in the vertical direction. The dome light can make the subject get enough light, and avoid forming large shadows while creating a three-dimensional sense; Plane light refers to the light that propagates along a straight line after being reflected or transmitted from the surface of an object; Scattered light is light that is irradiated through a medium and then onto a house or a plant.