What is the best ceiling brightness?

(1) the optimal brightness of the ceiling is mainly due to the brightness of the ceiling lamp. (2) the brightness of the ceiling also depends on the height of the ceiling, the ceiling is high enough, so that in the visual range, its height is not too much impact on people's comfort. At this time, the brightness of the ceiling can simply choose according to the actual needs. The ceiling height is low, so that the lamp is exposed to the visual range, such as the ceiling height of about 3M, its brightness should be designed and selected to avoid the impact of glare on people. (3) to increase the brightness of the ceiling can be used for upward lighting fixtures. At the top of the lamp is fully embedded, the ceiling, such as simply rely on the ground to reflect light, it is difficult to achieve the recommended brightness. The key is to choose what kind of lamps, while the ceiling should be as high as the reflection ratio. (4) when the lighting fixture is used in dark, the reflection coefficient of the ceiling surface should be greater than 0.6, and the illumination of the ceiling surface should not be less than L / 10 of the working surface illumination.