73‐3: Invited Paper: Influences of Circadian Illuminances from Lighting and TV on the Human Locomotor Activity, Sleep Disorder, EEG, HRV, and Melatonin Secretion

To address the need for an accurate evaluation of circadian illuminance (CIL) that precisely characterizes the intensity of blue light emanated by displays and/or lighting and to investigate how the blue light affects the human body biology, we developed the circadian illuminometer and applied it to two comparative clinical studies. In terms of the CIL from lighting, all of the circadian rhythm of locomotor activity, sleep quality, and melatonin secretion were improved for 12 subjects under circadian lighting in comparison to normal lighting. In a comparative study of the effects of evening watching TVs in high dynamic range mode, i. e., using two different types of 65‐inch TVs (A and B) in the market, on an electroencephalography (EEG), heart rate variability (HRV), and melatonin secretion, B is found for 32 subjects to have a better health effect on the human body than A in perspective of visual fatigue, arousal, concentration, comfort, and sleep disorder. A also showed significant circadian disturbance, which are mainly caused by a higher CIL in A (54.28 blx) than in B (25.18 blx). Finally, our results show evidence that the effects of CIL on locomotor activity, sleep disorder, EEG, HRV, melatonin, and circadian rhythm can potentially play the role of a new performance metric for human‐centric displays/lighting.