A bedside wall light has to do two jobs: give enough light to read by and stay out of the eyes of the person next to you. Fix it so the source sits about 60cm above the top of the mattress, usually 1.2 to 1.3m from the floor, then check the projection. Anything that projects more than about 30cm can catch a shoulder when you sit up.
A fitting with a glass or crystal diffuser gives a softer light over the pillow than an open lamp. Wiring is the part to settle early, since a chased-in cable and a switch reachable from the bed cost much less before the walls are finished.
