Cool but... where is the relay/electronics/power supply that control the light itself? Most systems like that are home run back at the house electrical panel.

Cool but... where is the relay/electronics/power supply that control the light itself? Most systems like that are home run back at the house electrical panel. You don't save any copper at all compared to the traditional switch. In fact, you use more of it! edit: In case I wasn't clear. The relay is back at the house electrical panel. So now every light requires a full copper run. This is because the relay has to be serviceable. An alternative would be to have special light fixtures with an accessible relay. This way the light electrical supply can hop from light to light.