This has two LEDs, but the coverage is so good that I usually switch on just one. You don't have to reposition it for every page. Possibly too bright for totally dark rooms, but not enough light for an unlit room during the day, if there are windows. If there is any little light in the room at night, it's fine. Probably about the same amount of light as those key ring LED lights, but more evenly lit, and covers a larger area.