The purpose of this research is to examine the causal relationship on comprehensive impression evaluation based on the perceived spatial distribution of light. The evaluation grid method was conducted to derive a causal hypothesis on the evaluation of various lighting environments in living-dining rooms, followed by a subjective experiment in actual spaces to analyze the causal relationship between perception and impression through structural equation modeling. The results showed that "brightness" and "dimness" caused by the position of light in the space are perceived as spatial distribution, and "spaciousness" or "interest" with those balances leads to a "preferable" impression through "comfort".