Light emitting means for external medical treatment with light

Apparatus for external medical treatment with the aid of light, said apparatus comprising:

• a light-emitting device to be held in close proximity to a patient's body, wherein said light-emitting device includes a plurality of light emitting elements that emit monochromatic light, drive means controlling the light-emitting device to emit at least one type of monochromatic light over at least one predetermined time period and to pulsate said emitted light in accordance with a predetermined pulse frequency over said at least one time period, and wherein said light-emitting device includes a casing and a plate that carries said light-emitting elements, an eccentric drive arrangement which includes a first part that is fixed relative to said casing and a second part that is connected to said plate;
• a spring carried by the casing to prevent rotation of the plate;
• and wherein the first part includes an electric motor to drive said eccentric drive arrangement so that the plate carrying said light-emitting elements executes an oscillatory movement.