client wants LED lights ( the small decking type ) fitting up the sides of the stairs. access is no problem, can get into void at side and supply from under stairs. the problem is that he wants them to switch using 2 PIRs, one at the bottom and one at the top, mounted in the same side panel. the only things i can find are occupancy sensors, but these are 3" diameter. what i need is 2 PIRs that are only about 1" diam. anyone know of a source for something suitable, or an alternative way of automatic switching from top and bottom of stairs.