According to the evaluation indexes of road lighting, the light distribution of Light Emitting Diode(LED) luminaries was optimized. A mathematical model of the illumination distribution for LED luminaries was established based on the relationship between the evaluation of road lighting and the illumination distribution. By taking the evaluation indexes of road lighting as the optimization conditions and the ratio(Q) of average luminance to average illuminance of road surface as an optimization target,the light distribution was obtained by solving a constrained optimization problem. Finally, the optimized light distribution was induced into lighting simulation software to simulate the LED luminaries for an asphalt trunk road. The result shows that the light distribution is asymmetric in the lateral direction, and the maximum intensity direction leans to the traffic lane. The light distribution saves 30. 3% in energy consumption compared to traditional symmetrical light distribution. Moreover,the Q value is 0. 072 7, which is higher than that of the normal asphalt trunk road. The evaluation of the road lighting meets the standard of CJJ 45-2006, and demonstrates that the lighting parameters are optimized well.%从道路照明评价指标出发,对发光二极管(LED)道路照明的配光进行优化设计.综合考虑照度分布与道路照明评价指标之间的函数关系,建立了LED路灯照度分布的数学模型.以照明评价指标为优化条件,亮度-照度比Q为优化目标,求解有约束的最优化问题,得到配光曲线.以沥青路面主干路为例,把得到的配光曲线导入照明模拟软件中进行仿真模拟.配光优化结果表明:其横向配光呈非对称分布,且最大光强偏向机动车道方向,比传统的对称式配光曲线节能30.3％;Q为0.072 7,高于一般沥青路面的比值;同时各项照明评价指标均符合CJJ 45-2006的要求,配光性能良好.
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