Effects of Newly Developed LED Lighting on Living Comfort in an Indoor Environment (Part 2) / 日本補完代替医療学会誌

ABSTRACT

<b>Objective</b> We conducted a clinical study to investigate the effects of newly developed LED lighting on living comfort in an indoor environment.<br> <b>Design</b> Twenty healthy subjects participated in a randomized crossover trial. They performed a mental task for 4 hours under ordinary lighting, and then rested for 1 hour under newly developed lighting or ordinary lighting. Sixteen of the subjects (8 males, 8 females) completed the trial. We evaluated subjective comfort using a visual analogue scale (VAS) and measured autonomic nervous system effects by the frequency analysis of a-a intervals on accelerated plethysmography (APG) waves.<br> <b>Result</b> The subjects’ VAS evaluations showed that the newly developed lighting increased their comfort, while frequency analysis of APG during the rest period was found to activate 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 in an indoor environment during a rest period after daytime work.<br>