Big flat light means that there are two flashlights with soft boxes on the left and right sides of the camera. Only two lamps are used to project the moon from the left and right corners to the height of the head and face. This projection method has no three-dimensional sense and layering, and there is no light bar. It only means that the eyeliner, nostril mouth line and nose bridge are flat. Nowadays, many ID photos use this light, and so do wedding photos. But it has no appearance, just light exposure.