In a previous study, no study has to date evaluated the effect of light color on human perception and impression evaluation during rainfall. In this study, the effect of light color during rainfall was evaluated, and the knowledge about creating attractive landscapes was investigated. Field experiments were carried out depending on the combination of changes in rainfall and light color. Then, the visual effect of light color during rainfall on human perception and impression evaluation was quantitatively assessed by rainfall simulation experiments.

　The factors evaluated were rainfall, light color, vertical illuminance, and stimulus purity. Three levels for rainfall (0 mm/h, 14 mm/h, 36 mm/h), four levels for light color (yellow, red, blue, green), and two levels for vertical illuminance (0.05 lx, 5 lx), and four levels of chroma (low, Low-mid., mid.-high, high) were set. Ninety-six presentation spaces constructed in all experiments were combined by factors and levels.

　As a result, the following became clear:

　1. Even if the amount of rainfall changes, the perception of Y system does not change in the low and medium chroma.

　2. When it rains, the chroma of the R system is perceived as low.

　3. When it rains, the chroma of B system is perceived as low.

　4. When it rains, the medium chroma and high chroma of the G system are perceived as low. On the other hands, when it rains, the low chroma of the G system is perceived as high.

　5. When there was a lot of rainfall, the light color signboards made a positive impression in terms of attractiveness, strength, flashiness, and beauty, and a negative impression in terms of stability, compared to when there was no rainfall.

　6. The attractiveness of the light color signboard in the night view during rainfall consisted of flashiness, beauty, and brightness. The attractive impression was enhanced in the case of G and Y system series, medium and high chroma, and rainfall of 36 (mm / h).