pyrometric cone number

例句：

1. 1. The pyrometric cone numberis used to measure the intensity of light.
   测光锥数用于测量光线的强度。
2. 2. The pyrometric cone number isan important factor in determining the brightnessof a scene.
   测光锥数是决定场景亮度的一个重要因素。
3. 3. Thepyrometric cone numberis used to calculate the exposuretime for photography.
   测光锥数用于计算摄影的曝光时间。