Study On The Classroom Lighting In University On Cirtopic

This dissertation is a subsidiary subject of the NCFS subject"Healthy Classroom Lighting Base on Cirtopic"(Grant No 50778182). The emphasis is focused on the optical biological effect of college classroom lighting and base on which to study the relationship between students'visual psychological feeling, physiological reaction, visual performance and illuminant colour, lighting condition. The purpose of this research is to provide enhanced scientific basis for the quantitative research of optical biological effect, applicable choice of illuminant colour, proposal of standard value of illuminance and energy saving lighting research.The ipRGCs which is the third kind of retinal cell, controls human biorhythm, biological clock and human pupil size through biological reaction by visible radiation, by which to influence human physical and mental health. It is called Cirtopic for this non-visual biological reaction and effect (Vision that supervises non-visual effect of the light, or vision of optical biological effect), it is also called optical biological effect for short. It is human being that apperceiving the light, so it should be more human-oriented and we should study more on optical biological effect such as visual perception, psychological feeling, physiological reaction and visual performance while considering the development of classroom lighting, by which to provide illumination environment of visual easy, myopia-prevention, physical and mental health and high learning efficiency.Firstly, this dissertation analyze the features of visual task of classroom, which are variability, long-term and quick-acting, pointing out that classroom lighting must fulfil the requirement of readability, psychic and physiological health and energy-saving lighting. We can understand that students would pay close attention to subjective feeling of visual perception and influence of illuminant colour of classroom lighting. Illuminant colour has close relationship with optical biological effect that has specific spectrum, light color, luminous intensity and pupil characteristic. It embodies research strategy that combines qualitative analysis with quantitative analysis by analyzing the relationship between subjective perception, physiological effect, visual performance of human being and objective changing data under different circumstances of illuminant colour and illumination level.This dissertation focused on the experiment device of"Measurement system of pupil size and recognition time under classroom lighting", chose three kinds of fluorescent lamps of typical colour temperature of High(6500K), Medium(4000K), Low(2700K), used eye tracker to analyze the specified laws for change of pupil size and recognition time under different illuminant colour and background luminance, figured out the function equation of variables by using the regression analysis and established the mathematical model of classroom lighting on Cirtopic. Research on the influence on difference of pupil size and recognition time under different circumstances of sighting targets and colour contrast has been implemented as well as followed by drawing a conclusion. It demonstrates that the spectrum distribution of fluorescent lamps of 4000K and 6500K is in accordance with the fact that ganglion cell of human eye would be sensitive while encounters shortwave light, from which the experiment result of little change of pupil size and faster speed for recognition of under medium and high colour temperature was verified.Comparison between visual task performance under different illuminant colour was carried out in real classrooms to study the relationship between different illuminant colour and visual performance and the influence upon study efficiency, together with analyzing the influence and effect of visual perception physiological caused by luminous environment through comparing human blood pressure, pulse and heart rate under diverse illuminant colour, and the evaluation from students concerning the favorability and comfort level of illuminant colours. Through experiments and research of psychological outcomes and physiological reaction of visual perception, the fact that illuminant colour has apparent biological effect on human being was further verified.This dissertation furthers applicative research base on optical biological research, analysis of current situation and experiments research. The Analytic Hierarchy Process was implemented to suggest an applicable illuminant colour, illuminance standard value and design concept for classroom lighting base on the overall evaluation of luminous environment from people. The dissertation point out that we should start from the user's need, combine student's subjective perception, qualitative valuation with illumination effect, quantitative analysis, and consider the overall effect that visual psychological feeling, physiological reaction, studying efficiency (visual performance) and illumination energy, Then we can design out the university classroom illumination environment satisfying the call for student study, health and green lights.The innovations of this dissertation are as following:1) Human-oriented is regarded as the basic principle, the research on the relationship among illuminant colour of artificial lighting of college classroom, student's vision, physical and mental health, study efficiency and energy-saving lighting base on human visual psychological feeling, physiological reaction and visual performance was carried out to create new design concept for classroom lighting base on photic biological effect.2) The visual effect on cirtopic under classroom lighting level was illustrated quantitatively and initially by pupil size and recognition time.3) The strategy for determining illuminant colour and proposed luminance standard value of artificial classroom lighting under optical biological effect was brought forward creatively.