The present invention relates to a device (100) for an application of directed actinic radiation to a subject (200), said device (100) comprising: an exposition tunnel (110) being capable of surrounding said subject (200) to be exposed to said actinic radiation, said exposition tunnel (110) being formed of one semi-cylinder barrel-shape first surface (120) made of a material substantially permeable to said actinic radiation to be applied to the subject (200), and of at least one second surface (140) made of said material substantially permeable to said actinic radiation to be applied to the subject (200), said at least one second surface (140) being capable of complementing the first surface (120) in forming said exposition tunnel (110)； the surfaces (120, 140) of said exposition tunnel (110) separating an inner space (130) where said subject (200) is exposed to said actinic radiation, from outer spaces (150, 160) where a plurality of radiation sources (170) 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 (100) and comprise means for fixedly holding, and electrically and electronically operating, said plurality of radiation sources (170)； 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 (100)； and means (184, 194) for the operation of the device (100), including a processing unit； said first and second parts of the chassis (180, 190) of the device (100) being capable of complementing each other in forming the outer shape of the device (100) by hingedly moving away from, or towards, each other； said device (100) further comprising: at least one further outer space separated from said inner space (130) by not any of said radiation-permeable first and second surfaces and located at eith
