Patent ID: 8729500

Claim:
A dielectric barrier discharge, DBD, lamp device comprising a toroid shaped discharge chamber having a discharge chamber wall comprising: a tubular inner wall section; a tubular outer wall section; two ring-shaped end wall sections, each of the end wall sections extending between an end of the outer wall section and an end of the inner wall section; a low voltage electrode comprising an electrically conducting fluid surrounded by the inner wall section of the discharge chamber wall, the low voltage electrode further comprising an electrically conducting element surrounded by the inner wall section of the discharge chamber wall and extending at least partly from a first end of the inner wall section to the other end, said electrically conducting element being electrically connected only at the first end; and two bushes at or near both ends of the inner wall section, said bushes comprising an electrically conductive part, the electrically conductive element being electrically connected to the electrically conductive part of a first one of two bushes without touching the electrically conductive part of the second one.