A processing chamber including a reaction chamber having a processing area, a processing gas inlet in communication with the processing area, a first excited species generation zone in communication with the processing gas inlet and a second exited species generation zone in communication with the processing gas inlet. One embodiment of the apparatus is a headlamp having an illumination source, a camera, and two eye pieces. The lamp is used to illuminate the decorative member. A first part of the visible side of the profile strip here lies in the extension of the surface formed by the gypsum panel while a second part of the visible side of the profile strip protrudes from this surface.