An experimental test of light supplementing effect on the growth of lettuce (Lactuca sativa L.) planted in greenhouses has been conducted with two types of light source of 400 watt, one of which is a high pressure sodium lamp (HPSL), and the other is a sunlight dysprosium lamp (SDL). The results show that the promotive effect of HPSL on photosynthesis is better than that of SDL under the same luminous intensity, but the difference is little. The distribution of luminous intensity of HPSL and SDL is different in space, and the total luminous intensity of HPSL is larger than that of SDL under the same power. According to the illumination requirement on crop growth and the luminous intensity distribution of different light sources, reasonable disposition of these two light sources in greenhouses has been designed: for HPSL 0.126/m2 and for SDL 0.171/m2.%用400 W的高压钠灯(HPSL)和日光色镝灯(SDL)两种光源对温室栽培生菜（Lactuca sativa L.）的生长进行了补光效果测试.结果表明，在相同的光照强度下，对于光合作用强度的促进效果，钠灯比镝灯好，但差异不很大.钠灯和镝灯在空间的光照强度分布不一样，在相同功率下，钠灯所产生的光照强度总体上比镝灯强.根据作物生长对光照的要求和不同光源的光照强度分布特点，分别设计了钠灯和镝灯在温室中的合理配置方式，钠灯为0.126 盏/m2,镝灯为0.171 盏/m2.
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