Research On The Influence Of Working Lighting Environment On Human Alertness And Its Regulation

With the research progress of human-machine-environment relationship in modern ergonomics and the advancement of LED technology,people have increasingly demanding lighting environments.In areas such as office lighting,vehicle lighting,surgical lighting,and aerospace lighting,LED lighting has been applied on a large scale,and the concept of health lighting has gradually received attention.Illumination can improve human performance,and the discovery of autonomous photosensitive ganglion cells(ipRGCs)has greatly promoted the study of non-visual effects of light.The current research methods for non-visual effects of light mainly rely on traditional subjective scales and task performance,and a few use the physiological signal methods of nuclear magnetic resonance and EEG.This study used near-infrared spectroscopy imaging technology combined with subjective scales and task performance to study the effects of different color temperature light environments on human alertness and working memory during the day and their regulating effects.This article first introduces the current status of research on the non-visual effects of light at home and abroad,summarizes the impact and adjustment results of lighting on human alertness,and then introduces the knowledge of photobiology and the basis of light affecting human performance.The third part is to design the experiment based on two factors of different color temperature and different light duration.It introduces the three correlated color temperature and light environment required for the experiment,the experimental process,the criteria for selecting subjects,and the evaluation methods used in this experiment,such as subjective Scale,task performance and physiological signals.The fourth part is a statistical analysis of the experimental data of this experiment,mainly including two results: First,the effect of different light on human alertness and working memory ability,among which,subjective scales(KSS,SSS,NASA-TLX),tasks Performance(MCT,N-back experiments)and physiological signals(fNIRS signals,including oxyhemoglobinHbO and deoxyhemoglobin Hb)both show that in terms of alertness,the higher the color temperature of the light environment,the better the alertness of the person.The degree of subjective alertness has increased significantly.The human brain has a higher oxygenated hemoglobin concentration in high color temperature and light environment,and the right brain is more sensitive to color temperature changes than the left brain.The deoxygenated hemoglobin concentration is higher in low color temperature and light environment.,22 channels show significant differences;in terms of working memory,different color temperature light environment will have a greater impact on tasks with lower working memory difficulty,and high color temperature environment can make people perform better.The second is the effect of different light duration on human alertness and working memory ability.The results show that the alertness of people in high color temperature environment will increase,and the alertness of human subjects in low color temperature light environment will decrease;in working memory,high The increase in the length of light in the color temperature light environment improves the working memory ability in low-difficult tasks,but has no obvious effect on high-difficult tasks.This research can be used to improve people's alertness and working memory ability through working with LED lighting,and improve work efficiency.The application of near-infrared spectral imaging technology has made attempts to improve the research direction of the non-visual effects of light on the human body,and verified the feasibility.