Device for external medical treatment using light, comprising a light emitting means (1) arranged to abut against or be held near the body of an individual as well as a drive device (9,10) for the light emitting means, which light emitting means comprises light emitting diodes or the corresponding (3,4), which light emitting diodes are arranged to emit light indifferent wavelength intervals, wherein the drive device (9,10) is arranged to control the light emitting means (1) to emit light of one or several wavelengths during one or sever- al predetermined times and to emit said light in a pulsating manner, which light emitting means comprises a cover and a light emitting diode plate(2), supporting the light emitting diodes, and wherein the light emitting diodes are positioned on said plate so that there is a certain distance between two adjacent light emitting diodes. The invention is characterised in that the drive device (9,10)is arranged to control the light emitting means to emit pulsating light with a pulse length which lies within an interval of about 60% to 90% of the time between the respective start edge of two consecutive pulses, and is arranged to vary the length of the pulses over time.Dispositif de traitement médical externe utilisant la lumière et comprenant un moyen démission de lumière (1) agencé pour venir en contact avec le corps dune personne ou être maintenu à proximité de celui-ci, ainsi quun dispositif de commande (9,10) pour le moyen démission de lumière, lequel moyen démission de lumière comprend des diodes électroluminescentes ou analogues (3,4), qui sont conçues pour émettre de la lumière dans différents intervalles de longueur donde, le dispositif de commande (9,10) étant conçu pour commander le moyen démission de lumière (1) afin quil émette de la lumière dune ou de plusieurs longueurs donde pendant un ou plusieurs laps de temps prédéterminés de manière pulsée. Le moyen démission de lumière comprend un couvercle et une plaque (2) supportan
