1- School of Architecture and Environmental Design, Iran University of Science and Technology
2- School of Architecture and Environmental Design, Iran University of Science and Technology , yazdanfar@iust.ac.ir
3- School of Architecture and Environmental Design, Iran University of Science and Technology, Tehran, Iran
Abstract:
Light significantly affects human physiological and psychological dimensions, particularly emotions, which play a key role in mental health. Exploring the relationship between the quantitative and qualitative characteristics of light and emotional or affective states in indoor architectural spaces is essential due to the substantial time people spend in such environments. However, a comprehensive study that integrates and summarizes existing knowledge in this field is still lacking. This systematic review aims to synthesize current evidence and identify research gaps. A total of 4,897 records were identified using relevant keywords from five databases: Scopus, Web of Science, ScienceDirect, PubMed, and APA PsycINFO. The review followed the Prisma 2020 guidelines. After screening (kappa = 0.784) and assessing eligibility based on PICOS criteria, 14 articles were selected according to the inclusion criteria and authors' consensus. Reviewing references led to the inclusion of one additional article. All 15 studies were rated as of acceptable quality, and their data were extracted. The findings reveal that most prior studies have evaluated the effects of Illuminance, Correlated Color Temperature (CCT), Lighting Color, and Lighting Distribution or Direction on Pleasure, Arousal, and Dominance (PAD) in predominantly administrative, commercial, or educational indoor spaces. Generally, all PAD dimensions are directly correlated with Illuminance level, and Arousal is directly related to CCT. Furthermore, the combination of direct and indirect Lighting and relatively complex lighting Distribution increase Pleasure, and Colored light heightens Arousal while reducing Dominance. Identified research gaps underscore the need for future studies focusing on artificial lighting dependent on interior architectural form, indoor natural light, residential environments, and the use of behavioral and neurophysiological indicators for emotion evaluation.