To provide enough brightness for optical tasks is the primary purpose of the lighting. However, just making light brighter is not sufficient in Japan today. In fact, in a variety of spaces, such as restaurants, cafés, bars and hotels, many fascinating lightings are installed to make spaces interesting, and many people prefer them. One of popular method to create a desirable lighting environment is to use partial and indirect lighting, which provides non-uniform light settings. Why people prefer non-uniform lighting? One possible reason is that non-uniform lighting makes a space complicated and interesting. However, we do not highly evaluate all non-uniformly lit environments, and thus there may be other reasons rather than complicatedness. Another possible reason should be that lighting can function to boost a sense of safety. Whether we can see surroundings and whether strangers can see us are also affected by the condition of lighting. The present study examined the effects of non-uniform lighting on the evaluation of a room. As stimulus, pictures of a scale model of a room were adopted. In the model there are two lights, one lit up a stranger in the back and another lit up the near table, supposed as participants. The physical brightness of a light for a stranger (bright or dark) and a light for a participants (bright or dark), and the color of lights (cool or warm) were systematically varied to provide all possible combinations. The participants were 118 students at the Nihon University (40 males and 78 females, average age: 19.07 years). Results revealed that the subjective brightness affects the evaluations of the room, and the physical brightness of the light for a stranger is the primary determinant of the subjective brightness. In addition, there is an interaction between the brightness of the light for a stranger and the color of the lights. For many evaluative scales, whether the color of the light has significant effects on them depends on the brightness of the light. In short, the brightness of the light for a stranger can strongly affects the evaluation of a room.