In order to design an LED desk lamp with simple light distribution and uniform illumination, the impact of the LED light source location on the lighting effect is explained in detail, based on parabolic optical characteristics. It is proved that the LED surface light source can make even light divergence if it is placed between the focus and parabolic vertices. Based on such a characteristic of the parabolic and after many experiments, the single LED surface light source is placed at the correct position between the focus and the rotating parabolic mirror vertex As a result, uniform illumination is achieved in a space with an area of 1 000 mm × 1 000 mm and 400 mm from desk lamp. With 10 such distribution of light combination arranged into a 2 × 5 light source module at a fixed size array, the demand of the desk lamp light distribution is thus satisfied.%为了设计一款配光简单、光照均匀的LED台灯,从抛物线的光学特性出发,详细说明了LED光源的放置位置对出光效果的影响.证明了把LED面光源放置在中心轴上焦点与抛物线顶点之间的适当位置,可以使光线均匀发散.利用抛物线的这个特性,经过多次实验把单颗LED面光源放在旋转抛物反光镜顶点与焦点之间的正确位置,在距台灯400 mm、面积为1 000 mm×1 000 mm的平面得到了均匀的光照.在总体光通量基本不变的情况下,把10个如此配光组合按一定尺寸排列成2×5分布的光源模块,能很好地达到台灯的标准配光要求.
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