The purpose of this research is to examine an ideal street lighting environment in Yatsuo Town in Toyama City which would not only harmonize with the streetscape but would also assist in crime prevention. The authors produced experimental lighting environments taking advantage of light leakage from building openings instead of present street lamps. The experiment results showed that the dangerous atmosphere of the street was reduced by light from the openings on the first floor. It was also found that light from openings with latticework were effective in recreating the traditional atmosphere of Yatsuo old town. In addition, it was understood that light from these openings, along with soft illumination of outside walls produced an attractive spectacle, when visitors viewed the row of houses from a distance.
