The wall light is the most versatile lamp in the house: it lights your bed for reading, replaces bedside table lamps, guides you down the stairs, illuminates the bathroom mirror and welcomes guests at the front door. There is just one condition – it has to hang in the right place and at the right height. In this guide we have gathered specific measurements for every room: how high to mount a wall light by the bed, in the living room, bathroom and on the façade, how to choose the light direction, and when to go for a wall light with a switch or a USB port.