Subjective Evaluation And Visual Function Research On White LED Classroom Light With The Same CCT And Different Spectrum

This thesis based on the general program of National Natural Science Fund of China, "photo-biological safety study of classroom light environment "(Grant No. 51178483), upon our preliminary research results and the latest research results at home and abroad in the field of photo-biological effect, for three white LED light environment with the same color temperature and illuminance and different spectrum, through multi-sample evaluation index investigation, the subjective evaluation experiment of classroom white LED light environment with same color temperature and different spectrum, and small sample visual function experiment, using the reasonable data processing methods for statistical analysis, studied subjects’ subjective evaluation difference in the artificial light environments with the same color temperature and illuminance and different spectrum, and their influence on the subjects’ visual function, and put forward the integrated light environment evaluation method.First of all, on the basis of related research at home and abroad, the thesis introduced the domestic and foreign photo-biological effect research result of light environment with same color temperature and different spectrum, and corresponding research method of light environment subjective evaluation, and analyzed the advantages and disadvantages of LED used in the classroom lighting, and various design indexes of classroom lighting, confirmed the main problems and research direction of this thesis, that was through the subjective evaluation experiment of classroom white LED light environment with same color temperature and different spectrum, and visual function experiment, to explore the light environment on which the subjects’ subjective evaluation and physiological reactions were better, and to comprehensively evaluate the light environment with scientific data processing method.The thesis research mainly divided into three parts: the first part was the importance rating investigation about the subjective and objective evaluation index for classroom light environment. The second part was the subjective evaluation experiment of classroom white LED light environment with same color temperature and different spectrum, as well as the establishment of the subjective evaluation function. The third part was the visual function experiment of classroom white LED light environment with same color temperature and different spectrum through the index test of emotional scale, KSS scale and far vision, color vision. At last, based on the result analysis of the subjective evaluation experiment and visual function experiment, reasonable suggestions were put forward on the classroom light environment design and evaluation.The part of importance rating investigation about the subjective and objective evaluation index: for many college students, importance rating research on the subjective and objective evaluation index were made, according to the results of the investigation, objective light environment physical indicators needed to control in the follow-up experiment, and the evaluation index used in the subjective evaluation experiment were confirmed.The part of subjective evaluation experiment: mainly the subjective evaluation experiment of classroom white LED light environment with same color temperature and different spectrum was conducted, and according to the importance rating investigation the various indexes’ weight were determined, and then the evaluation results were made by the evaluation function established with analytic hierarchy process(AHP), finally, in three kinds of light environment with the same color temperature and illuminance and different spectrum, the one with participants’ better subjective evaluation was determined, and the possible reason for the evaluation result was analyzed from the spectral formation.The part of visual function experiment: mainly the visual function impact experiment of the three light environments has been carried, and according to the experimental result, it was concluded that the light environment in which subjects’ visual function affect was the smallest, and the cause of the more biological effect such as the subjects’ mood change and degree of fatigue was analyzed from the spectral composition.Through the above study, the thesis finally reviewed and summarized the whole experiment, and based on the analysis of spectral characteristics and color rendering performance of light environment, reasonable suggestions for classroom lighting design were provided, and the comprehensive evaluation method for light environment, the combination of subjective evaluation and visual function physiology experiment, was put forward.