Research On Digitalized Model Of Spectral Response For Biological Effects Of Lighting

This dissertation is a subsidiary of the national basic research program of China (973 program NO.2010CB734102). This research presents two main ideas. One is to establish a spectral response model based on physiological changes like heart rate, body temperature, blood pressure. Second is to establish a modification spectral response model for V(?) based on the difference between subjective brightness and measured luminance because the V(?) underestimates the contribution for short wavelength. The evaluation model established in this study seprates the visual channel and non-visual channel effectively and is useful for on-site lighting evaluation of biological effects. This work may have some contributions to the establishment of people-oriented lighting standards.This research works starts with the investigation of the main researches in this topic internationally. This work introduces the visual channel and non-visual channel between eye and brain, as well as the limitation of the CIE photometric system for biological effect evaluation. The two main evaluation models including based on melatonin suppression and pupil size variation are also introduced. Both the advantages and the disadvantages of the two models are discussed. The immediate physiological changes and subjective brightness are presented to establish a more direct and practical spectral response model.In this work a vital signs observation system is used to record the physiological changes according to different light level and spectra. The difference between subjective brightness and measured luminance is discussed and the spectrum is determined as a main cause of different subjective brightness under same measured luminance or illuminance.The physiological changes and subjective brightness due to different light level and spectra are analyzed based on the theory of psychophysics and experimental psychology. The new evaluation model for biological effects is established based on the experiment results. Compared with the present two evaluation models, the models established in this work is more direct and practical for application.Besides the theoretical study, the results from this study are also applied in lighting projects. The school lighting environments are observed and analyzed. A new design guide which consider both visual effects and non-visual effects is applied in classroom lighting design project. The suggestions for white LED application in future indoor projects are also discussed based on the design guide.The innovations of this dissertation are as following:1). The immediate physilogical changes are applied to evaluate the biological effects of lighting. Based on the study of CIE photometric system, the spectral response model based on heart rate through target function and characteristic wavelength study is established. The evaluation model is more immediate, direct and wide-used compeared with the melatonin suppression model.2). The difference between subjective brightness and measured physical luminance is used to evaluate the lighting biological effects. A spectral response model is established to modify the underestimation of short wavelength by V(?). This evaluation model is more simple and practical for application compared with the pupil size variation model.3). According to the school lighting environment observation, the spectra diffence between daylight and artificial light is studied. The design guide for school classroom lighting design is prsented by the consideration of both visual requirements including illuminance, uniformity, color rendering, glare and non-visual requirements including spectrum and CCT. The design guide is applied to real lighting projects and gets good feedback.