Prioritizing the effect of "Light" in the religious places and environments with an emphasis on the sense of spirituality

The current study aimed to study the light and its intensity in the case study (Cathedral of Santa Maria del Fiore). In the first section, the research method was field research and descriptive-analytical, and in the second section, the study was conducted using Analytic Hierarchy Process. The statistical population included experts in Islamic architecture, environmental psychology, and conservation. The research tools were visual questionnaires and the available software in this regard to analyze the data and simulate the lux intensity. The lighting confusion in the religious places, such as churches, caused issues that made the researchers consider developing codified principles and regulations to measure the required light in the interior environment of these buildings and direct the interior quality of the religious places to improve the spiritual aspect based on these principles. (c) 2021 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Ain Shams University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/ by-nc-nd/4.0/).