Base On Pedestrian Walk Through The Street LED Road Lighting Efficiency Study

LED as a new light source, the light-emitting principle and luminosity mode iscompletely different from the traditional light source. Contemporarily, LED hasapplied to carry out part of the city road lighting. Its energy-saving potential is veryhuge due to the flexibility of the control method and the less power than traditionallight source. The brightness level of the road illumination light environment is in themiddle of the visual environment, while the international community is still notunified the photometry model under mesopic vision. Consequently, the visual efficacyunder mesopic vision of LED must be studied to take advantage of new LED lightsource and produce the best possible results of saving energy, which has extremelysignificance of lighting energy-saving.The first stage of this subject has examined a large number of representative highpressure sodium lighting roads and LED lighting roads in Tianjin for a long term, andhas obtained the basic data required for the experiment. The research found that thephenomenon of pedestrian walking through road is more obvious in secondary roadsas well as in branch, meanwhile, on LED lighting roads, drivers are easier to findpedestrian who is walking through the road. Therefore, in the basis of the situation ofthe pedestrian walking through the roads, using the visual effectiveness of law whichemploys reaction time as parameters to research the road lighting under mesopicvision. According to the test data, basic information and research methods, thereaction time test system for road lighting was developed liberty during the secondstage, the preparatory work of experiment was complete as well. The third stage isexperimental section, at this stage the visual efficacy of high pressure sodium and thethree widespread LED lights were tested under mesopic vision, simultaneously, thebasic data of30samples was obtained. After screening and analysis the experimentalraw data scientifically,30samples’ universal parameter values of the reaction timeare gained which is under the condition of4lights in different road brightness level.On one hand, universal parameter values were used to fitting mathematical processthrough spass software, and then the visual efficacy function of the relationshipbetween surface brightness and reaction time of high pressure sodium and three LEDlights under mesopic vision was gained. On the other hand, after control analysis thecharacteristics and spectral of these universal parameter values and four kinds of lights, the main factors and wavelength spectrum which affect human reaction timeunder mesopic vision can be achieved.The article is divided into seven chapters, as follows:1Introduction;2Functional analysis of the human eye under mesopic vision;3Performance indicators of LED and early road lighting test;4Laboratory equipment and experimental designs;5Analysis of experimental data;6Conclusions and Outlooks...