luminance distribution

例句：

1. 1.The luminance distribution of the light source is crucial for accurate measurement.
   光源的光度分布对准确测量至关重要。
2. 2. In this experiment, we measured the luminance distribution of the LED light source.
   在这个实验中，我们测量了LED光源的光度分布。
3. 3. The luminance distribution of the sky was changing as the sun set.
   随着太阳落山，天空的光度分布正在变化。