单位面积功率指单位被照面积上灯的安装功率。也叫功率密度。
之后在器件的实际工作条件下，确立了以单位面积输出最大功率为原则对器件的几何尺寸进行了优化；
The maximum output power at the unit area was established as the principle to optimize the physical dimension of the device.
把用热器放在锅、水壶等）放在焦斑处，就可以得到较大的太阳辐射能流密度，也就是说，在单位面积上可以得到较高的太阳辐射功率。
When the heater is placed in the pot, kettle, etc. , it is placed in the focal spot, and the larger solar radiant energy density can be obtained.
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