beam brightness

例句：

1. 1. The beam of sunlight illuminated the path ahead.
   阳光的光束照亮了前方的道路。
2. 2. The new LED light bulb has a much higher brightness than the old one.
   这款新型LED灯泡比旧款的亮度要高得多。
3. 3. The scientist used a special device to measure the beam brightness of the sun.
   科学家使用了一种特殊的设备来测量太阳的光束亮度。