You got that a bit wrong Little Hawk.
The light on the moon is direct from the sun and the phase of the moon depends on the viewing angle.
To demonstrate:-
1: Get yourself a torch with a good strong beam and a ball.
2: Set up torch and ball so that the torch shines DIRECTLY onto the ball from a distance of 4 or 5 feet.
3: Draw the curtains and turn the lights off.
4: Walk around the ball and look at the way that, from different angles, the light from the torch only lights up a portion of the ball as seen from each angle.
If you view from behind the torch you will see the full ball;
If you view from 90 degrees to the light beam you will see a half ball.
At different angles you will see a different "phase of the ball."
The phases of the moon are caused by the same effect.