Exploring The Non-visual Effects Of The Integration Of Daylight And Electric Lighting In Workspaces

Healthy building is the strategic demand of healthy China,the demand for the deep development of green buildings,and also represents the demand for healthy life of people with growing living standards.As an important component of architectural health,how light affects people’s physiological and psychological health is a research hotspot in architectural optics.The concept of rhythmic lighting has emerged and has made extensive progress in improving emotions,promoting arousal,regulating rhythmic disorders,and developing intelligent lighting products.However,in real office spaces,natural light and artificial light are often used in a mixed state,which is currently a gap in research on rhythmic lighting.It is urgent to establish a quantitative evaluation of the non-visual effects of mixed light environments.The main content of this study includes: 1.on-site research on the current situation of mixed light use in office/learning spaces in Beijing,and literature review on relevant data on mixed light use in office spaces abroad;2.Conduct mixed light experiments and illuminance color temperature cross experiments in real office spaces to verify the nonvisual effects of mixed light use and select appropriate experimental parameter ranges;3.Design an experimental space that can meet the needs of mixed light experiments,and control and adjust the light environment parameters of the experimental space through an intelligent lighting control system and adjustable skylights and side windows;4.We conducted research experiments on mixed lighting scenarios using various non-visual evaluation methods such as subjective questionnaire,cognitive performance evaluation,and physiological indicator detection,targeting different modes of skylight and side window lighting;5.Explore the laws of experimental data,propose a function curve of non-visual proportion parameter time of daytime natural light,and summarize suggestions for architectural design and lighting design.The paper consists of nine chapters.The first chapter introduces the research background,elaborates on the research content and methods,research significance,proposes the research framework of the paper,and clarifies the key issues and innovative points to be solved.Chapter 2 reviews the current status of non-visual research on light through a systematic literature review,pointing out the shortcomings of the mixed use of natural and artificial light.Chapter 3 summarizes the seasonal,temporal,and directional patterns of the existing office space lighting environment through on-site research and literature search,accumulating data on the proportion of natural light in real space.Chapter 4 clarifies the control requirements for the experimental light environment through mixed light experiments and illumination color temperature cross experiments conducted in real office spaces.In Chapter 5,a mixed light experimental space with controllable natural and artificial light was designed and completed.The non-visual proportion index of natural light in the eyes was proposed,and the experimental process design was completed for two different experimental scenarios: skylight and side window.Chapters 6 and 7 analyzed the results of skylight and side window experiments,analyzed the impact of non-visual proportion of natural light in the eyes on subjects’ arousal,emotions,physiological indicators,and cognitive performance,and explored the effect of natural light fluctuation on non-visual feedback.Chapter 8 delves into the experimental results,evaluates the non-visual differences between skylight lighting and side window lighting,summarizes the threshold time curve of the optimal natural light proportion coefficient,and establishes a model to evaluate the non-visual performance of office space mixed light scene cases.Chapter 9 summarizes the research conclusion and proposes design suggestions for mixed lighting usage scenarios in office space,including office space design,health lighting design,and lighting and shading products.The research limitations and prospects are pointed out.