There is a Use Constraints option on the View menu (say what?). Unselecting it does **not** turn off the Full Constraint setting on the elements. Whatever.

Here's what the dog's head looks like with just a single "Moonlight" object, default settings. Strangely enough, repositioning the "moon" has no effect on the lighting! I recognize that using C6P to its full potential will refine the image, of course.