Hand Lamp

This is usually a small metal pot about the size of a night-light candle. It has a hinged flip-up lid with a mirror on the inside; a silver mirror is often used, so the item is not cheap. The mirror directs the light, and the lid also works as a snuffer when closed. The lamp provides enough light for the thief to work by (e.g., when trying to pick a lock in a dark place), while not shedding enough to give the thief away (hopefully). Certainly, the dim, focused light is unlikely to be visible at all further than some 20 feet from the thief, and even within this range it is very, very dim.