The Sun is far more brilliant in space than on Earth.
Our atmosphere scatters the Sunlight all over the sky (well, the blue color), but on the Moon, the Sunlight comes only from one source: the Sun.
The amazing thing about our Moon is that its axis of rotation is only tilted 1.5 degrees relative to the Sun.
If you're on the Poles of the Moon, you'd see the Earth at the same place on or above or below the horizon and changing just a little during a lunar orbit around the Earth (libration).
The Sun would also be very close the horizon but circle around you, always very close or below the horizon, during the same timeframe.

If we ever placed a huge mast on the uppermost mountain in the Poles, we'd have constant sunlight bathing its highest parts.

That energy could be beamed towards the Earth, but not necessarily.
It could also be beamed to other spacecrafts, satellites, probes, to feed them or to push them.
Of course, if it's a tight energy beam, it better not be aimed towards Earth.

Raoul