We have just designed the Worlds thinnest LED wall light. 25mm thick! We did it using Tridonic replaceable LED boards and remote Tridonic LED drivers. Using a thick aluminium back plate and running the board at a low current we were able to keep the LEDs running at the correct temperatures. These are going into passenger lifts where space is at a premium. Front disc simply screws on and off to change the finish of the product or service the LEDs should you ever need to. Very sustainable!