A medical system for illuminating a structure of interest inside a human or animal body, the medical system comprising: i) a medical device comprising a controllable light source according to any of the preceding claims, characterized in that said medical system comprises: ii) a control unit for generating a control signal for controlling the controllable light source, wherein the control unit comprises, iii) a receiving unit configured to receive data of the human or animal body, iv) a further receiving unit (266, 366) configured to receive stored information from a memory (261, 361), said memory configured for storing information as to i) a depth of a structure of interest (220, 320) within a tissue and/or a cavity of the human or animal body, and ii) the wavelength, or range of wavelengths suitable for illuminating the structure of interest (220, 320) based on the depth of said structure of interest (220, 320) within the tissue and/or the cavity, whereby the control unit is arranged to generate, based on the received data and stored information, a control signal capable of being received by the controllable light source so that said controllable light source illuminates the structure of interest at a wavelength, or a range of wavelengths suitable to illuminate the structure of interest.L'invention concerne un système médical permettant d'éclairer une structure d'intérêt à l'intérieur d'un corps humain ou animal, le système médical comprenant : i) un dispositif médical comprenant une source de lumière réglable selon l'une quelconque des revendications, caractérisé en ce que ledit système médical comprend : ii) une unité de commande servant à générer un signal de commande pour régler la source de lumière réglable, l'unité de commande comprenant iii) une unité de réception conçue pour recevoir des données du corps humain ou animal, iv) une unité de réception supplémentaire (266, 366) conçue pour recevoir des informations stockées à partir d'une mémoire (261, 361),
