brightness coefficient

例句：

1. 1.The brightness coefficient of the light source is crucial for the accuracy of the measurement.
   光源的亮度系数对于测量的准确性至关重要。
2. 2.In this experiment, we used a brightness coefficient to adjust the brightness level of the display.
   在这个实验中，我们使用亮度系数来调整显示的亮度水平。
3. 3.The brightness coefficient of the material was determined by measuring its reflectivity and transmittance.
   该材料的亮度系数是通过测量其反射率和透射率来确定的。