High intensity discharge lamp with improved startability and performance

11) A lamp comprising:

• a discharge vessel;
• electrodes spaced apart in the discharge vessel comprising tungsten or tungsten alloy;
• a fill sealed within the vessel having a pressure between 50-200 mbar, the fill comprising:
• a starting gas comprising:
• 85-95% argon and 15-5% xenon;
• optionally radioactive Kr85 with a maximum activity level of 0.124 MBq/l as part of the starting gas;
• a voltage riser component;
• a metal halide component;
• and
• an active tungsten regeneration cycle wherein the fill comprises a species of said tungsten or said tungsten alloy of the electrode material during lamp operation, wherein the solubility of tungsten or components of tungsten alloy in said tungsten or tungsten alloy species is lower in the gas phase adjacent to the electrodes than at close proximity of the wall of the discharge vessel.

15) A lamp comprising:

• a discharge vessel;
• electrodes spaced apart in the discharge vessel comprising tungsten or tungsten alloy;
• a fill sealed with the vessel having a pressure between 50-200 mbar, the fill comprising:
• a starting gas which comprises:
• 70-95% argon and 30-5% krypton;
• optionally radioactive Kr85 with a maximum activity level of 0.124 MBq/l as part of the starting gas;
• a voltage riser component;
• a metal halide component;
• and
• an active tungsten regeneration cycle wherein the fill comprises a species of said tungsten or said tungsten alloy of the electrode material during lamp operation, wherein the solubility of tungsten or components of tungsten alloy in said tungsten or tungsten alloy species is lower in the gas phase adjacent to the electrodes than at close proximity of the wall of the discharge vessel.

19) A lamp comprising:

• a discharge vessel;
• electrodes spaced apart in the discharge vessel comprising tungsten or tungsten alloy;
• a fill sealed within the vessel having a pressure of less than 50-200 mbar, the fill comprising:
• a starting gas which is completely void of argon comprising:
• at least one of xenon and krypton;
• optionally radioactive Kr85 with a maximum activity level of 0.124 MBq/l as part of the starting gas;
• a voltage riser component;
• a metal halide component;
• and
• an active tungsten regeneration cycle wherein the fill comprises a species of said tungsten or said tungsten alloy of the electrode material during lamp operation, wherein the solubility of tungsten or components of tungsten alloy in said tungsten or tungsten alloy species is lower in the gas phase adjacent to the electrodes than at close proximity of the wall of the discharge vessel.

23) A lamp comprising:

• a discharge vessel;
• electrodes spaced apart in the discharge vessel comprising tungsten or tungsten alloy;
• a fill sealed with the vessel having a pressure between 50-200 mbar, the fill comprising:
• a starting gas which comprises:
• 55-10% argon, 15-5% xenon and 30-5% krypton;
• optionally radioactive Kr85 with a maximum activity level of 0.124 MBq/l as part of the starting gas;
• a voltage riser component;
• a metal halide component;
• and
• an active tungsten regeneration cycle wherein the fill comprises a species of said tungsten or said tungsten alloy of the electrode material during lamp operation, wherein the solubility of tungsten or components of tungsten alloy in said tungsten or tungsten alloy species is lower in the gas phase adjacent to the electrodes than at close proximity of the wall of the discharge vessel.

27) A lamp comprising:

• a discharge vessel;
• electrodes spaced apart in the discharge vessel comprising tungsten or tungsten alloy;
• a fill sealed with the vessel having a pressure between 50-200 mbar, the fill comprising:
• a starting gas which comprises:
• 55-10% argon, 15-5% xenon and 30-5% krypton;
• a radioactive Kr85 with a maximum activity level of 0.124 MBq/l as part of the starting gas;
• a voltage riser component;
• a metal halide component;
• and
• an active tungsten regeneration cycle wherein the fill comprises a species of said tungsten or said tungsten alloy of the electrode material during lamp operation, wherein the solubility of tungsten or components of tungsten alloy in said tungsten or tungsten alloy species is lower in the gas phase adjacent to the electrodes than at close proximity of the wall of the discharge vessel.