Case Study on the Effect of a Human-Centered Smart Lighting System on the Comfort Preferences of Office Workers with Different CCTs

This study examines the impact of human-centric lighting (HCL) in an open-plan office at Istanbul Technical University, involving 24 participants. The design process included circadian lighting metrics and simulation tools, focusing on varying Correlated Color Temperatures (CCTs) and their influence on visual comfort and satisfactions. The experiment used a wireless automation system to adjust lighting conditions and collect data on visual cognitive performance and preferences through questionnaires and performance tests. The results showed that a CCT of 2700K positively impacted participants, enhancing vertical illuminance and reducing task errors compared to 3800K and 6000K. Some dissatisfaction was reported with the 6000K setting. The study suggests that individualized, user-controllable lighting systems can improve office workers' satisfaction and cognitive performance, proposing the integration of energy-efficient, human-centered lighting systems in open-plan offices.