The Influence of Lighting System Photometric Characteristics on Mental State of Users. The Case Study of Keyboard Handwriting

Abstract

The results of existing research regarding the relationship between color temperature, lighting parameters, and mental state have limited data on multi-user space. This study is aimed at identifying the possible effect of color temperature and illuminance on mood, concentration, and, as a result, improvement or deterioration of the performance. During the experiment, the participants solved problems related to professional and educational activities. The collection of data on the mental state of the subjects was carried out automatically using an electronic survey including: self-assessment scale (SAN), state-trait anxiety inventory, visual-associative self-assessment of the emotional state of the masked personality, subjective well-being scale. In addition, to the assess performance, Kraepelin Table was used. The relationship between lighting and the mental state often manifests itself after a long-term effect. The illumination modes 3500 K 325 lx and 4000 K 300 lx are the most optimal modes for implementing artificial lighting in adaptive systems for office spaces. The collected results, conclusions, and recommendations were based on correlating the data of psychological surveys of participants and an objective method of analysis based on the investigation of the keyboard handwriting of subjects. The results show that color temperature and light levels affect behavior, mood, and performance in multiplayer environments. Taking into account the results obtained, this adaptive lighting technology can be introduced into the system of an office or study space, where adaptation is important not only for a specific person, but also for a group of users.