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照明计算中维护系数主要取决于三个因素，并用三个相应的系数表示，它们分别是光源的光通量衰减系数、照明器积尘减光系数和房间积尘污染光损失系数。本文用表格形式给出各种不同情况下的三个系数值，可供照明工程设计者使用。同时指出我国现行的主要照明设计标准中维护系数取值过高，或推荐照度值偏低，按这些标准设计的照明工程参考面上照度常常不能满足视觉要求
The maintenance factor in lighting calculation mainly depends on three factors and is represented by three corresponding coefficients, which are the luminous flux attenuation coefficient of the light source, the dust reduction coefficient of the luminaire and the light loss coefficient of the dust accumulation in the room, respectively. In this paper, the form of three different values given under different conditions, for lighting project designers. At the same time, it is pointed out that the maintenance coefficient of China’s current major lighting design standards is too high or the recommended illumination value is too low. According to these standards, the illuminance of the lighting project reference surface often can not meet the visual requirements