Directional adaptation describes the ability of a lamp to change the direction in which it emits light. This feature allows the user to direct the light beam to the exact area of the body desired, for example the face in the treatment of seasonal affective disorder or a specific joint. Directional adjustment is provided in a variety of ways, most commonly by means of an adjustable joint, a flexible arm called a gooseneck, or a folding stand. This allows the lamp to be used in a variety of positions, whether the user is sitting at a desk or lying down. Correctly directing the light is crucial to ensure that the therapy is effective and that the light hits the target area at the correct angle and from the recommended distance.