Patent ID: 6867556

Claim:
Device for operating a high pressure discharge lamp comprising: a discharge lamp, wherein the discharge lamp further comprises: a silica glass discharge vessel housing a pair of opposed electrodes separated by a distance that is less than or equal to 1.5 mm, wherein the discharge vessel is filled with at least 0.15 mg/mm 3 of mercury, and bromine in the range of 10 −6 μmol/mm 3 to 10 −2 μmol/mm 3 ; and a feed device that supplies an alternating current to operate the discharge lamp, wherein the feed device controls the discharge lamp such that a reduction of the operating voltage of the discharge lamp causes a reduction in the discharge wattage and an increase in the operating voltage of the discharge lamp causes an increase in the discharge wattage, and wherein the control of the discharge wattage is carried out without interruption with respect to the change of the voltage.