ABSTRACT Research on human-centric lighting (HCL) is actively being conducted to provide an optimal lighting environment that takes into account the physical and mental states of humans, as well as energy savings and improvements in convenience. This study is a proof-of-concept study that proposes and implements the concept of an IoT-based emotional lighting system using instant message (IM) data. The system we propose performs emotion analysis based on IM data to automatically control the lighting environment of the home according to the emotional state of the occupants when they return home. The lighting system was programmed using Node-RED to extract only the necessary data for emotion analysis from IM data, translate it into English, and perform emotion analysis in IBM Cloud’s Natural Language Understanding (NLU) to adjust the color of the lighting according to the emotional state of the occupants. Based on previous studies that demonstrated the effect of color on emotion regulation, this study selected lighting colors that are appropriate for the emotional state of occupants. The operability of the system was then tested through its implementation in a mock-up studio. Our proposed emotional lighting system, which utilizes IM data, enhances convenience by minimizing the need for occupants to manually intervene. Furthermore, this system can be effortlessly implemented in any personal space and offers scalability due to its seamless integration with other smart devices.
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