I would use no light at all.

Put a ball where the moon is, and give that ball a healthy dose of ambient.....

Preview will be black, but the render would come out quite well.

Did this to simulate a streetlight once.
Takes some guesswork, but well worth it.
Render low quality untill satisfied. As it will take a lot f test renders.
Then increase the quality for the final result.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!