Light in Nightscape and Perception of Security among Pedestrians, Case Study: Tehran

Abstract

One of the most important urban areas is street s and intersections that play an important role in shaping the overall identity of a city. The city is defined by the presence of the humans at night and nightlife plus visual sense plays the most important role in the perception of urban space. In addition, most of the things that are received by the sense of sight are with the help of light. Therefore, light and lighting in urban spaces as a non-physical element will have a huge impact on the quality of urban space. The main question in this study is the effects of lighting on the pedestrians’ understanding of the sense of security in Valiasr Street .In this regard, two variables of light color and light intensity are evaluated and considered based on eight hypotheses. To test these hypotheses, the main variables were first investigated and scrutinized. Then, according to the survey conducted, indicators related to the variables were determined and the items were designed. The main data collection tool is the questionnaire and among the pedestrians of Valiasr Street in Tehran that were selected as statistical population, 228 persons were randomly questioned. Due to the discrete nature of variables, a nonparametric function was used for their analysis. Calculation method using Kendall’s correlation analysis was analyzed using SPSS software. The findings show that that the satisfaction rate of light intensity is low, but their satisfaction with the lighting, light color, sense of security, and the ability to recognize faces is assessed averagely. Regarding the light color, people preferred white color to yellow one. The findings in this study suggest that using the white light instead of yellow and increase of light intensity increase the sense of security in pedestrians.

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