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Vol.26 No.3(2019-06)
Keywords Light pollution; Light trespass; Advertisement signs; Space lighting; Vertical illuminance
Abstract The purpose of this study is to figure out the current state of light trespass. This unwanted light at night was created particularly by advertising signs and was coming through windows in residential areas, including Seoul, Incheon and Gyeonggido, Korea. 235 locations have been selected in 58 regions of the three areas. The study has shown that 171 locations have complaints about light trespass from the sign and the average of illuminance was approximately 23 lx, ranging from 3 lx to 140 lx. And the average of illuminance in 64 locations of urban residential areas was 10 lx, ranging from 2 lx to 22 lx. Considering the allowable light level of 10 lx, the average in 171 locations and in 64 locations each exceeds 78% and 43% over. In terms of glare effect, (luminance) internally illuminated signs were lower than channel letter signs. However, unwanted light from the internally illuminated signs entering into a window was in a higher level as these signs have larger surface.