"IF the Moon had a shiny mirror-like surface, the sun light would reflect directly off it and shine on the "back" of the Earth. this wouldn't mean "less" energy, but the moon would look like a small dot of bright light - like a more-distant version of our Sun."

The brightest of this spot would blind a human eye so one would probably unable to see the less bright areas of this Moon.

As far as less energy, there would more reflected energy and thereby less heat energy to radiate [wouldn't function as much of a black body.] Though aluminum which less reflective can get pretty hot in Space and Aluminum [given enough time] would oxide from the Oxygen the in solar wind.