Assessment of Anidolic Integrated Ceiling effects in interior daylight quality under real sky conditions

The goal of this research is to demonstrate, according to subjective and objective evaluations, that a passive Anidolic Integrated Ceiling (AIC) is able to provide an adequate illumination level for optimal visual and task performance in deeper office spaces and to prove its effectiveness in enhancing interior daylighting quality. A quantitative study was performed by calculating the D.GI.P from spherical images in an office room, while a qualitative evaluation was achieved by using questionnaire survey. Experimental results confirmed that the AIC significantly improves luminous comfort by providing a uniform luminance distribution throughout space. Responses obtained from 62 subjects show that 64.51% of participants were satisfied with their daylighting. In addition, ANOVA test results showed that there is a significant correlation between quantitative and qualitative evaluations of the interior daylight distribution.