The front piece is Plexiglas covered in a sun film. Both sides are reflective, one more than the other. But its still transparent.
The back is another piece of plex the same size, covered in a completely reflective mylar film. They were both purchased surplus for maybe $0.50 a yard. It came with
no adhesive coating, so I mixed some corn syrup with water and rubbed the film smooth onto the plex, let dry overnight, worked better than I thought.
LEDs are then suspended around the perimeter in the middle of the 2 mirrors. They are all wired in parallel and are powered from a
Simple Constant Current Regulator and a 5 volt power supply.
The gallery has a layout diagram that helps explain.