Street lighting lamp with long life, high efficiency, and high lumen maintenance

A method of forming a lamp, comprising:

• providing a discharge vessel;
• sealing an ionizing fill within the vessel, the fill including;
• an inert gas, a halide component including:
• a sodium halide,
• a thallium halide,
• at least one of a calcium halide and a strontium halide,
• at least one of a rare earth halide selected from the group consisting of lanthanum, cerium, praseodymium, and neodymium;
• and
• positioning electrodes within the discharge vessel to energize the fill in response to a voltage applied thereto.

A lamp comprising:

• a discharge vessel:
• electrodes extending into the discharge vessel,
• an ionizable fill sealed within the vessel, the fill including:
• an inert gas, a halide component including:
• a sodium halide,
• a thallium halide,
• at least one of a calcium halide and a strontium halide, and
• at least one of a rare earth halide selected from the group consisting of lanthanum, cerium, praseodymium, and neodymium, and combinations thereof;
• and wherein an aspect ratio of the discharge tube is satisfied by:
• 2.0<EA/Di<4.8
• where EA=a distance between the electrodes, and
• Di=an inner diameter of the discharge vessel.