Patent ID: 8729800

Claim:
A high intensity discharge lamp, comprising a ceramic discharge vessel having sealed first and second end plugs and an external electrical antenna, wherein a. The discharge vessel encloses a discharge volume, comprises first and second electrodes, and contains a filling; b. the end plugs enclose first and second current lead-through conductors, which current lead-through conductors are in electrical contact with the electrodes, and which current lead-through conductors comprise first and second metal portions extending to the exterior of the ceramic discharge vessel through first and second end plug openings; c. the end plug openings are sealed with first and second sealing glasses enclosing at least part of the metal portions; d. the external electrical antenna extends over at least part of the external surface of the ceramic discharge vessel and over at least part of external surface of first end plug, wherein the shortest distance (L A-M ) between a first end of the electrical antenna and the first metal portion is in the range of 0.1-5 mm, and wherein the electrical resistance of the first sealing glass between the first end of the electrical antenna and the first metal portion is <100 kΩ.