With the development of newer technologies in lighting industry, it has become widespread that lighting not only aims to meet visual needs on task planes, but also consider overall spatial brightness. Spatial brightness relates to the perceived quantity of light within a space, or the light that is influencing the appearance of a space rather than illuminating the tasks. Many past studies have pointed out two main factors that affect perceived spatial brightness [1]. The first factor is the space surface reflectance. In Figure 1, it is perceived that surfaces with higher reflectance are brighter. The second factor is the lighting distribution of space. Figure 2 shows that different lighting distribution of lamps can greatly affect the perception of brightness. In this study, an alternative luminance-based metric �Feu� was used as a spatial brightness indicator. A set of computer experiments were conducted to evaluate how surface reflectance and the lighting distribution influence the perceived spatial brightness. Based on the results of the experiments, recommendations for surface reflectance and light distribution were proposed.