Amid popular attention to nighttime views, night scenery of waterfronts is very popular with people. Even so, the issue of light hazards has appeared even in the case of waterfronts, and related quarters are presumably anxious about countermeasures to be taken. This research is to verify to what degree light can be reduced, with the evaluation of night views left intact. Consequently, the following three points became clear: (1) "Walls" are composed of a great volume or light and highly brilliant rays. (2) However, "walls buttress the evaluation of night views. (3) It is possible to reduce the light on walls to about 30% of its original level, without deteriorating the evaluation of the night views concerned.
