ABSTRACT
<b>Objective</b>: We conducted a clinical study to investigate the effects of newly developed LED lighting on living comfort and work performance in an indoor environment.<br> <b>Design</b>: Sixteen healthy subjects participated in a randomized crossover trial. They performed a mental task (2-back task and ATMT) for 8 hours under newly developed LED lighting or ordinary LED lighting. We evaluated subjective comfort using a visual analogue scale (VAS) and work performance by ATMT. Moreover, we measured changes in the autonomic nervous system by frequency analysis of a-a intervals on accelerated plethysmography (APG) waves to elucidate the mechanism of action.<br> <b>Result</b>: The subjects’ VAS evaluations showed that the newly developed LED lighting increased their comfort and attenuated their fatigue, and ATMT evaluations showed the lighting improved work performance during the mental task period, while APG frequency analysis revealed changes in the parasympathetic nerve system.<br> <b>Conclusion</b>: This newly developed LED lighting produces suitable illumination and color temperature and is useful for improving living comfort and performance in an indoor work environment.<br>