Evaluation of Annual Light Environment for Visual and Non-visual Effects in the Ground-floor Classroom Based on Lark 2.0 Spectral Simulation Tool
The quality of the classroom light environment has a significant influence on the physical and mental health of teenagers.With a typical ground-floor classroom in Soochow University Experimental School as an example,the Lark 2.0 spectral simulation tool was used to evaluate the trends and compliance of annual Melanopic Equivalent Daylight(D65)Illuminance(M-EDI)and horizontal illuminance in each area of the classroom based on the threshold standards of visual and non-visual metrics.The results show that:1)The availability of natural light in the classroom on the ground floor is limited.Under natural lighting only,the near-window area on the north side can provide adequate M-EDI and horizontal illuminance,while the compliance rates in other areas are low.2)The annual light variations in different areas are complicated and differently influenced by seasonal conditions.The percentage of Circadian Effective days in the front area is significantly lower than that of Visual-illuminance Effective days,and the opposite in the back area.3)The rates of light compliance before 09:00 and after 15:00 are lower.The Stimulus frequency compliance days are relatively low in winter,with a fragmented distribution from April to October,and insignificant differences between spring,summer,and autumn.4)In actual use,the annual horizontal illuminance of classrooms can reach the threshold,while the M-EDI cannot.This study aims to provide a reference for visual and non-visual driven healthy light environment design in the classroom.
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