闪光指数

例句：

1. 1. The flash index is used to measure the brightness of a light source.
   闪光指数用于测量光源的亮度。
2. 2. The flash index is an important factor in determining the quality of lighting.
   闪光指数是决定照明质量的重要因素。
3. 3. The flash index can be affected by various factors, such as temperature and humidity.
   闪光指数会受到温度和湿度等多种因素的影响。