Patent ID: 7245075

Claim:
An arc discharge lamp comprising: a light transmissive envelope formed from ceramic, the envelope having a wall defining an enclosed volume; a first electrode assembly extending from the lamp exterior through the wall in a sealed fashion to be in contact with the enclosed volume; a second electrode assembly extending from the lamp exterior through the wall in a sealed fashion to be in contact with the enclosed volume; a xenon fill gas in the enclosed volume with a cold fill pressure from 100 Kilopascals to 500 Kilopascals; a fill material including NaI with a weight percent from 29.91 to 38.40, CeI 3 with a weight percent from 12.80 to 18.14, DyI 3 with a weight percent from 33.50 to 52.28, CaI 2 with a weight percent from 11.31 to 15.02 and TlI with a weight percent from 3.49 to 4.25; and wherein the fill material does not include mercury, indium, gallium, or zinc or compounds including these elements.