A device for an application of directed actinic radiation to a subject, said device comprising: - an exposition tunnel being capable of surrounding said subject to be exposed to said actinic radiation, said exposition tunnel being formed of one semi-cylinder barrel-shape first surface made of a material substantially permeable to said actinic radiation to be applied to the subject, and of at least one second surface made of said material substantially permeable to said actinic radiation to be applied to the subject, said at least one second surface being capable of complementing the first surface in forming said exposition tunnel; - the surfaces (120, 140) of said exposition tunnel separating an inner space where a subject is exposed to said actinic radiation, from outer spaces (150, 160) where light sources capable of emitting actinic radiation through said surfaces (120, 140) are mounted; - said outer spaces (150, 160) being housed in at least first and second parts of a chassis (180, 190) of the device and comprise means for fixedly holding, and electrically and electronically operating, said light sources; means (182, 192) providing said at least first and second parts of the chassis (180, 190) with electric power; means capable of ventilating, heating and/or cooling the device; and means (184, 194) for the operation of the device, including a processing unit; said device further comprising - at least one means capable of controlling, and optionally varying, a radiant flux Φ of at least one actinic radiation-emitting light source by changing the at least one light source's electronic parameters in accordance with the geometric position of said at least one actinic radiation-emitting light source, relative to its distance from the inner space, thereby achieving an even radiance E at the subject exposed to said actinic radiation, wherein said means capable of controlling, and optionally varying, a radiant flux Φ of at least one actinic radiation-emitting light source comprise at least one or more than one electronic control member changing the light sources' electronic parameters in accordance with the geometric position of said at least one actinic radiation-emitting light source, relative to its distance from the inner space. - an exposition tunnel being capable of surrounding said subject to be exposed to said actinic radiation, said exposition tunnel being formed of one semi-cylinder barrel-shape first surface made of a material substantially permeable to said actinic radiation to be applied to the subject, and of at least one second surface made of said material substantially permeable to said actinic radiation to be applied to the subject, said at least one second surface being capable of complementing the first surface in forming said exposition tunnel; - the surfaces (120, 140) of said exposition tunnel separating an inner space where a subject is exposed to said actinic radiation, from outer spaces (150, 160) where light sources capable of emitting actinic radiation through said surfaces (120, 140) are mounted; - said outer spaces (150, 160) being housed in at least first and second parts of a chassis (180, 190) of the device and comprise means for fixedly holding, and electrically and electronically operating, said light sources; means (182, 192) providing said at least first and second parts of the chassis (180, 190) with electric power; means capable of ventilating, heating and/or cooling the device; and means (184, 194) for the operation of the device, including a processing unit; - at least one means capable of controlling, and optionally varying, a radiant flux Φ of at least one actinic radiation-emitting light source by changing the at least one light source's electronic parameters in accordance with the geometric position of said at least one actinic radiation-emitting light source, relative to its distance from the inner space, thereby achieving an even radiance E at the subject exposed to said actinic radiation,