| Multimedia classroom is a place where students engage in mental activities for a long time.The lighting environment plays a vital role in the students’ learning activities and health.In addition to meeting the needs of visual effects,the photobiological safety of the lighting environment in the multimedia classroom space should also be fully considered.and non-visual effects,providing a comfortable,safe and healthy lighting environment.The thesis takes the lighting environment of the multimedia classroom as the research object,adopts the objective quantitative experimental method,and based on the research on the biosafety of lighting in the multimedia classroom,the students’ subjective alertness and concentration,mental work ability,brain fatigue load and daytime The degree of sleepiness is the experimental index.The parameter variables of illuminance(300lx,1000 lx and 2000lx)and lighting color temperature(4000K,5000 K and 6500K)are used to study the influence of different lighting conditions on non-visual effects in multimedia classrooms.The function model is used to evaluate and apply the lighting environment of multimedia classrooms,and propose healthy lighting parameters and lighting environment space optimization strategies that comprehensively consider vision,photobiological safety and non-visual effects in multimedia classrooms.The thesis is one of the main contents of the "Thirteenth Five-Year" key R&D plan funded by the Ministry of Science and Technology,"Research on Key Technologies of Dynamic Light Environment Design Based on Non-Visual Effects".The research results provide basic data and specific parameter suggestions for the key technology research and application of healthy lighting environment in multimedia classrooms.The main research contents of the paper include:(1)Investigate and study the basic lighting conditions,light environment distribution characteristics,student behavior characteristics and subjective evaluation of the multimedia classroom space,and analyze the practical problems existing in the multimedia classroom lighting environment;(2)Set up experiments to test the multimedia classroom space lighting under different lighting conditions.Measure the spectral distribution of the display terminal and the display terminal,and evaluate the photobiological safety of the multimedia classroom lighting environment according to the actual use;(3)Using intensity,mental work ability,brain fatigue load and daytime sleepiness as indicators,experiments were set up to quantitatively study the influence of different lighting conditions in multimedia classrooms on each indicator;(4)Based on photobiological effect optical radiation measurement system,the optical radiation illuminance of multimedia classrooms was established.According to the calculation method,a comprehensive evaluation model of multimedia classrooms is established according to the contribution weights of key technical indicators,and a comprehensive evaluation of the lighting environment of multimedia classrooms is carried out.(5)The key parameters and design strategies for the practical application of healthy lighting suitable for multimedia classroom spaces are proposed.The paper mainly draws the following conclusions:(1)The spectral radiation intensity actually received by human eyes in the multimedia classroom space is far lower than the direct radiation intensity of the light source.Under normal use conditions,the blue light radiation of LED lighting and display terminals commonly used in the multimedia classroom space is within the safety limit.(2)The changing characteristics and rules of the influence of different lighting conditions on students’ non-visual effect indicators were obtained.Relatively higher color temperature can improve students’ alertness and concentration,and reduce daytime sleepiness,but high color temperature lighting also increases the degree of brain fatigue,and the ability of mental work increases first and then decreases with the increase of color temperature.(3)Obtain the comprehensive evaluation results of multimedia classroom lighting.Under the commonly used illumination level of 300lx～500lx,the comprehensive evaluation of 4000 K lighting is lower,and the color temperature of 5000 K has a better comprehensive effect.The multimedia classroom should appropriately increase the illumination and color temperature to meet the healthy lighting environment.demand.(4)It is concluded that when the non-visual equivalent illuminance value of multimedia classroom is 300 lx,it has the best comprehensive effect,and the corresponding recommended values of common architectural lighting color temperature and illuminance parameters are 4000 K and 1500 lx ～2000lx,5000 K and 1000lx～1500lx,6500 K and 500lx～ 750 lx.(5)Propose a design strategy suitable for the application of healthy lighting in multimedia classrooms.According to the spectral distribution characteristics of multimedia classrooms and the requirements of healthy light environment,it is proposed that the horizontal distance between the front of the front row of desks and the electronic display screen should not be less than 2.7m.This paper provides basic data and specific parameters for the construction of a people-oriented healthy lighting environment in multimedia classrooms,and has practical significance for solving the major needs of multimedia classroom space healthy environment.The research results are of great value to the research and application of key technologies for healthy lighting environment in multimedia classrooms,and have important reference significance for the research and evaluation standards of healthy lighting environment in other types of building spaces.The paper mainly achieves innovation in the following aspects:(1)According to the spatial light distribution characteristics and student behavior characteristics of multimedia classrooms,the paper studies the blue light weighted radiation intensity under different illumination,color temperature and lighting distance conditions through experiments,and establishes a blue light radiation intensity model of LED lighting in multimedia classroom spaces.The evaluation was carried out,and the illuminance limit value under the distance between the multimedia classroom space lighting fixture and the human eye was proposed.(2)On the basis of photobiological safety,the paper quantitatively studies the influence of multimedia classroom lighting environment on physiological indicators such as daytime alertness,concentration,brain fatigue and daytime sleepiness of students through experiments,and proposes a comprehensive evaluation index of multimedia classroom lighting.and evaluation models.(3)According to the distribution characteristics of lighting environment in multimedia classrooms and the characteristics of students’ behavior,the paper proposes specific parameters and space optimization design strategies suitable for healthy lighting in multimedia classrooms. |
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