luminous time ratio

例句：

1. 1. The luminous time ratio of the light source is an important factor in determining its efficiency.
   光源的光时间比率是决定其效率的重要因素。
2. 2. The luminous time ratio of the LED light is much higher than that of the traditional incandescent light.
   LED灯的光时间比率远高于传统白炽灯。
3. 3. In order to improve the efficiency of solar cells, researchers are working on reducing the luminous time ratio of the solar cells.
   为了提高太阳能电池的效率，研究人员正在努力降低太阳能电池的光时间比率。