Spectrum Optimization Design Of LED Lamps Suitable For Lighting Of Chinese Historical Sites

With the continuous development of urbanization in China,urban lighting project has become one of the main ways to enhance the image of large and medium-sized cities.As a symbol of Chinese culture,Chinese ancient architecture will put forward higher requirements in lighting design.Compared with modern architecture,Chinese ancient architecture is rich in color,meanwhile requires high light source and high color rendering index.However,sometimes the light source with high color rendering index can not create a good night scene,mainly because CRI-R_a,the commonly used index to evaluate the color rendering index in lighting engineering at present,is based on a small number of color samples,and only considers the reduction degree of the color with medium brightness and color saturation,so it is not suitable for the white LED with narrow and steep spectrum,which leads to the designer could not choose lamps correctly.Therefore,this paper adopts a method to improve the color rendering performance of existing LED commercial lamps by superposing monochromatic light to optimize the spectrum.The specific methods are as follows:First of all,CQS(color quality Scale)based on the color calculation system,the area of the color gamut of the basic white LED light source can be increased in the range of visible light in the CQS system,and the amplitude of the superimposed monochromatic light can be selected according to the color quality scale Qa;secondly,the data of commercial LED beads can be selected in the best superimposed range for superimposed simulation,and then the target spectrum can be obtained.Through the analysis of the target spectrum obtained by simulation,the corresponding photometric and colorimetric parameters are calculated.The theoretical results obtained by this method are verified by trial production of lamps and visual experiments.Through the way of testing and illuminating the ancient Chinese architectural model,the optimized lamps are evaluated from the objective and subjective perspectives.The results show that the color rendering ability and color quality of the optimized lamps will be improved,and the color gamut area will be widened after the monochromatic light of the blue light band is superposed,but the visual effect is not good,and the color quality will decline;the color quality of the monochromatic light of the red light band will increase with the amplitude of the superposed beads,and the superposed junction of the red light in the subjective evaluation will be improved Fruit is also more popular.Through the above method,the light source with wide color gamut can be obtained more quickly,and the light source with wide color gamut can withstand the consideration of multiple color evaluation indexes.The optimization of spectrum is more purposeful and faster than the design of spectrum.We can optimize the spectrum according to the lighting requirements of ancient buildings,so as to obtain high-quality white LED light source.It is a new method to solve the problem of color rendering of white LED.