Glad you have decided to have a go at natural id. Hope it goes well.
Hogs don’t like the lights going on and off too much, but if the light is on when they come to feed, they don’t seem to mind at all. So, I turn on the light – in the summer when it starts to get dark – usually before they arrive. I think if there is food there, they would get used to it. The patio here is rather old and has grass growing between the bits, but I don’t think they would mind normally flat stone, but possibly not loose stuff so much. After I have taken the bowls in (I normally only feed for 2-3 hours), I use solar lights, which have the advantage that they can be moved onto grassy areas and being aimed generally downwards, not so intrusive to the neighbours.