街路灯の光源種類が歩行者の視環境に与える影響: 津田沼南口商店会の街路灯改修(水銀灯からLEDランプへ)の効果検証

摘要

夜間に歩行者が感じる犯罪に対する不安感を軽減し、安心して歩行できる外部空間を形成するためには、見通しや鉛直面照度の確保が重要であると指摘されている。実際に鉛直面照度が高い方がひったくりの発生件数が少ないとの調査報告もある。%Subjective experiment was conducted to identify the effects of changing the light source of the street lighting on the passengers' visual environment at nighttime in an actual situation. The results showed that there was no significant difference in the impression of the lighting environment evaluated at the entrance of the street between high pressure mercury lamp street lighting and LED street lighting. However, visibility of the opposite passenger's face was improved by changing the light source of the street lighting from high pressure mercury lamp to LED. It was also identified that LED street lighting caused significantly higher glare than high pressure mercury lamp street lighting.