An international survey on residential lighting: Analysis of winter-term results

By conducting an international survey on residential lighting, a great variety of data showing the differences and similarities in lighting conditions among Poland, Turkey, Sweden and the U.K. were collected which provided an overall perspective for raising the standards of luminous environments. A total of 500 participants (125 respondents from each country- 47.6% females, 51.2% males, and 1.2% who did not wish to specify gender) provided detailed self-assessments of the lighting conditions in their living areas. The study identified interrelated factors associated with residential lighting using descriptive statistics, correlation coefficient functions and thematic analysis. As the survey results showed, the satisfaction with daylighting quality depends on daylighting sufficiency, daylighting uniformity, and number of sunlight hours (i.e., sunlight exposure), view-out and ratio of windows in the living area. Moreover satisfaction with artificial lighting quality depends on artificial lighting sufficiency, artificial lighting uniformity, artificial lighting brightness, and artificial lighting color rendering index. Overall, the findings of the study showed the potential factors that can be used to effectively change the day- and artificial lighting in residential areas, leading to a sustainable and better lighting environment

An international survey on residential lighting: Analysis of summer-term results

Obtaining visual comfort, satisfaction and well-being in residential interiors are now becoming more important, especially in times of extreme events such as the COVID-19 pandemic. It also became important to collect users' evaluations and their own solutions for residential lighting in order to improve the current lighting conditions. For this aim, with a group of international and inter-disciplinary researchers, a comprehensive study was conducted. This study is the last part of a three-stage investigation aimed at increasing our knowledge of the current lighting conditions in residential areas during and after the COVID-19 pandemic. For the current study, an online survey and in-depth interviews were conducted between June and August 2022 in Poland, Turkey, Sweden, and the U.K., with 520 participants. As results of this study show, a correlation was found between daylight satisfaction and its sufficiency. Similar correlations were found between artificial lighting satisfaction, its sufficiency, and its uniformity. The differences between seasons were detected for being very satisfied with daylight quality. Also, the correlation between satisfaction with daylighting and the ratio of windows showed difference among seasons. Stronger correlations between satisfaction with artificial lighting, its sufficiency and uniformity were found in summerterm according to winter-term results. Correlations between artificial lighting brightness – CRI and uniformity weakened in summer-term. Results from open-ended questions and in-depth interviews showed, removing the shading device and augmenting the characteristics of artificial lighting were the mostly done adjustments during the COVID- 19 pandemic. The most prominent theme is visual comfort according to the in-depth interview responses.

Short-term analysis of residential lighting: A pilot study

Lighting is one of the environmental elements that facilitates people to maintain their lives. With light people can collect visual cues about their environments in which they can perform visual tasks safely and comfortably. Exploring the lighting systems and conditions in residential interiors is important for introducing new concepts concerning human visual comfort. The study aimed to collect data and conduct a short-term analysis about residential lighting which will be a part of a more comprehensive research. The study focused on day- and artificial lighting systems, conditions and people’s assessments in interiors of residential buildings. An internet-based survey was distributed in July-August 2020 through Google Survey across Poland, Turkey, the U.K. and Sweden in the native languages of each country. 29 adult females and 31 adult males voluntarily participated in the present study. The study identified several interconnected factors related to residential lighting and explored them in detail. Large percentage of the respondents were satisfied or very satisfied with daylighting quality in summer (86.7%) and artificial lighting quality (78.4%) in their living areas. The amount and uniformity of lighting were the most effective cues connected with the respondents’ satisfaction. Reasonable and promising outcomes that were found can be used in generating new and comprehensive data about lighting quality in residential buildings

Analysis of residential lighting in Poland: results from a winter term survey

In 2020, an international project on residential lighting started and was implemented in four countries (Poland, Sweden, UK and Turkey). This article presents the results of a survey carried out in Poland, in the winter term between November 2020 and January 2021. A total of 125 Polish residents (59 women, 65 men, one person did not wish to specify gender) participated in the survey. A variety of data was collected on the respondents and their assessments as well as on their satisfaction with day- and artificial lighting in residential living spaces. The results from questionnaires were analyzed with STATISTICA 13.3. Descriptive statistics and Spearman rank order correlations were adopted to identify the light-related aspects, lighting patterns, and respondents’ perception of day- and artificial lighting conditions in living areas. The results revealed that satisfaction with daylighting in the living area, both in summer and winter, was significantly correlated with daylighting level, daylighting uniformity, sunlight exposure and view-out. The results also revealed that satisfaction with artificial lighting was significantly correlated with artificial lighting level, artificial lighting uniformity and color rendering. The results provide valuable information on lighting and factors that influence the luminous environment in residential living spaces