The effect of command cabin light environment on work performance based on psychophysiological characteristics

Command cabins often cause operator fatigue and errors due to confined layouts, complex tasks, and monotonous environments. This study recruited 25 healthy male operators. Under a fixed illuminance of 340 lx and three correlated color temperature (CCT) conditions (3000 K, 4500 K, 6000 K), participants performed dynamic tasks. Psychological comfort was assessed with Likert scales, task performance with accuracy and completion rates, and synchronized physiological indicators were recorded. Results showed that 4500 K lighting produced smaller pupil diameters, reduced physiological tension, and yielded the best performance and comfort. The 3000 K condition significantly increased pupil diameter, electromyography (EMG), and electrodermal activity (EDA), indicating higher physiological load and reduced efficiency. Although 6000 K also reduced pupil diameters, it induced larger EMG and EDA fluctuations, reflecting discomfort and poorer performance. These findings identify 4500 K as the optimal lighting for sustained-attention tasks and provide guidance for command cabin lighting design.