I have a stain glass window that I want installed correctly as a basement faux window with a light behind it.?

I want suggestions on light kits or back lighting that is safe to put in a wall? As it is right now the contractor wants to put tin foil in the wall to act as a reflector and I would prefer he not do this due to safety concerns. Please suggest safe ways to back light a stain glass window installed in a sheet rock and timber wall structure.