support the free end of the inner tube for example in the region of the getter tube between the inner tube and the outer tube with a suitable means for example an appropriately sized holding disk in order not to impair the exchange of discharge medium and consequently the getter effect the holding disk does need to have corresponding openings for example bores slits or the like however the invention will be explained in more detail below with reference to an exemplary embodiment in the figures fig1 a shows a longitudinal sectional illustration of a dielectric barrier discharge lamp according to the invention fig1 b shows a cross sectional illustration of the lamp shown in fig1 a along the section line ab identical or functionally identical elements have been provided with the same reference symbols in the figures fig1 a and 1 b show a very schematized illustration of a longitudinal section and respectively a cross section along the section line ab of an exemplary embodiment of the dielectric barrier discharge lamp 1 according to the invention the elongate discharge vessel of the lamp 1 comprises an outer tube 2 and an inner tube 3 with a coaxial double tube arrangement as a result of which the longitudinal axis l of the discharge vessel is defined the.