A Model Of Lighting Quality In Classroom Based On Field Luminance Distribution

In recent years,with the popularization of higher education and the poverty alleviation of education in poverty-stricken areas,the demand for educational resources in China has gradually increased.As an infrastructure,the number of classrooms is increasing.Due to the arrangement of class hours,the use of classroom at night is widespread and more frequent.As one of the physical environment of classroom,lighting environment has an important impact on the construction of learning atmosphere and visual effect.The current classroom lighting design standard specifies several main lighting quantities,such as illuminance,color temperature,color rendering index,etc.However,the lighting environment in space is a whole.The traditional lighting parameters not only ignore the coordination and unity of the lighting environment,but also are difficult to establish a direct relationship with the subjective and objective response of people.Therefore,it is of great significance to explore the influence of classroom lighting environment on human subjective and objective performance by choosing parameters with stronger integrity and closer relationship with human.This study put forward three research problems to be solved: 1)determine new parameter variables,which can reflect the integrity of lighting environment,and have stronger relevance to the subjective and objective performance of people;2)take the subjective feeling and objective visual function as the evaluation indexes to explore the influence of parameter variables on the quality of classroom lighting environment;3)determine the recommended parameter indexes of lighting design and establish the evaluation model of classroom lighting environment quality.Through the reading and thinking of relevant literature,combined with the problems to be solved in this paper,the processes of this study is proposed: use luminance parameters,supplemented by color temperature parameters,to explore the feasibility of it as the overall lighting environment parameters and determine the variable parameters of this study,then explore the impact of variable parameters on subjective feelings and objective visual function indexes through experiments.This paper will rely on the variable space experimental cabin of Tianjin University to carry out the relevant experimental research.The specific research process includes:(1)build the real scene of the classroom in the experimental cabin,using adjustable lighting equipment to set the lighting conditions,and measuring the brightness and color temperature parameters;(2)carry out subjective evaluation and objective visual function test experiments,and obtaining the experimental data;(3)use Logical Regression and Factor Analysis to deals with the experimental data,explores the law between the variable parameters and the subjective and objective evaluation indexes,and determines the comprehensive quantitative index F of classroom lighting environment quality;(4)use Support Vector Machine(SVM)algorithm to establish the comprehensive evaluation model of classroom lighting quality.In this paper,the influence of luminance and color temperature parameters on the subjective and objective indicators of the classroom lighting quality is studied,which provides a theoretical basis for the optimization of the relevant standards of the classroom lighting.At the same time,the comprehensive quantitative index F of the classroom lighting quality is defined,and the comprehensive evaluation model of the classroom lighting environment is established,which provides guidance for the classroom lighting design.