A guesthouse stairwell had a switch only at the bottom, and a guest missed the last two steps coming down in the dark. PIR-controlled corridor and stairwell lighting removes the need to find a switch at all: lights trigger automatically as someone approaches and switch off on a delay after they've passed. This guide covers where PIR suits guest corridors versus where microwave sensors work better, how to avoid a stairwell light cutting out mid-flight, and how this differs from outdoor PIR security floodlighting.

