The present invention relates to a device and to a method 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 a subject (200) is exposed to said actinic radiation, from outer spaces (150, 160, ...) where light 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 (181, 191, ...) for fixedly holding, and electrically and electronically operating, said light 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 further operation of the device (100) said device (100) further comprising at least one means (171) capable of controlling, and optionally varying, a radiant flux Φ of at least one actinic radiation-emitting light source (170) by changing the at least one light sources electronic parameters in accordance with the geometric position of said at least one actinic radiation-emitting light source (170), relative to its distance fro
