standard irradiance

例句：

1. 1.The standard irradiance of the sun is about 1360 W/m².
   太阳的标准辐射强度约为1360瓦特每平方米。
2. 2. The standard irradiance of sunlight varies with altitude and time of day.
   阳光的标准辐射强度随海拔和一天中的时间而变化。
3. 3. The standard irradiance of a light bulb is measured in lumens per second.
   灯泡的标准辐射强度以流明每秒为单位测量。