Moon On A Windy Stormy Night

I saw the moon through the clouds as I was driving home so when I got to my driveway I pulled out my camera using a 200mm lens to capture what I saw. Ended up taking two exposures. One for the clouds then one for the moon. Exposure Info. for the clouds  f-2.8   1/100  ISO 3200  for the moon   f-2.8   1/640  ISO 200. As you can see there is a big differences in the cloud exposure compared to the moon exposure. The way to understand why the moon needs less exposure is the fact the surface of the moon is as bright as a sunny day here on earth. Remember it is the same sun that lights the moon and earth. By the way I used Photoshop to combine the two images.