<p>The invention relates to an SAD lamp, comprising a light source that emits light comprising wavelengths in the range from 400 to 500 nm, a blue-free region (2) in which blue light of wavelengths from 400 to 500 nm is not emitted being arranged in the central field of the lamp (1). The invention also relates to a device for producing a blue-free region (2) of an SAD lamp (1), comprising a shutter (2) whose size can be varied by means of a control unit, the control unit being connected to a distance sensor (3) for determining the distance A from the lamp (1) to the eye of the viewer.</p>
