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 said subject is exposed to said actinic radiation, from outer spaces (150, 160) where a plurality of radiation 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 plurality of radiation sources; means (182, 192) providing said at least first and second parts of the chassis (180, 190) with electric power; means (183, 193) capable of ventilating, heating and/or cooling the device; and means (184, 194) for the operation of the device, including a processing unit; - said first and second parts of the chassis (180, 190) of the device being configured to complement each other in forming the outer shape of the device by being configured to hingedly move away from, or towards, each other; said device further comprising at least one further outer space separated from said inner space and located at either one or both of the longitudinal ends (111, 112) of the exposition tunnel, said at least one further outer space housing a plurality of additional radiation sources (310A, 310B) configured to emit radiation towards the subject in a direction forming an acute angle with a longitudinal axis (A - A) of the device, and at least one cooling means for the plurality of additional radiation sources (310A, 310B), characterized in that the additional radiation sources (310A, 310B) comprise LEDs, and that said at least one cooling means for the plurality of additional radiation sources (310A, 310B) comprises at least one narrow space light appliance cooling system comprising heat pipes for cooling the plurality of additional radiation sources (310A, 310B). - 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 said subject is exposed to said actinic radiation, from outer spaces (150, 160) where a plurality of radiation 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 plurality of radiation sources; means (182, 192) providing said at least first and second parts of the chassis (180, 190) with electric power; means (183, 193) capable of ventilating, heating and/or cooling the device; and means (184, 194) for the operation of the device, including a processing unit; means for fixedly holding, and electrically and electronically operating, said plurality of radiation sources; means (182, 192) providing said at least first and second parts of the chassis (180, 190) with electric power; means (183, 193) capable of ventilating, heating and/or cooling the device; and means (184, 194) for the operation of the device, including a processing unit; - said first and second parts of the chassis (180, 190) of the device being configured to complement each other in forming the outer shape of the device by being configured to hingedly move away from, or towards, each other;