For the moon object, put the light at exactly the same coords that the moon has, make twice as large as the moon, max it's strength and turn off cast shadows. That allows the light to radiate through the moon. I then put the sun at 0 and 90 vertical and dial it's strength back to 1 and turn off shadows for it as well. You will need t replace the tree object/pop with the default Sweet Birch, almost the same tree and find a map for the moon...mine didn't work today...I really must refine how I got it to work next time I do...save it as a .tgc next time I guess....