Abstract: Disclosed herein are mercury free ceramic metal halide high intensity discharge lamps of specified arc tube geometry and composition of ionizable fill. Embodiments herein generally employ a discharge vessel formed of a ceramic material having an aspect ratio satisfied by 1<ITL/ID<4.5 where ITL is the inner total length of the discharge vessel and ID is the inner diameter of the discharge vessel. The ionizable fill typically comprises xenon at a cold fill pressure of from about 3 to about 15 bar, and a halide component comprising sodium halide, thallium halide and/or indium halide, and at least one rare earth halide. Disclosed advantages may include betterment in both lumen run-up and color shift upon dimming, as compared to mercury-containing CMH HID lamps.

Abstract: Disclosed herein are mercury free ceramic metal halide high intensity discharge lamps of specified arc tube geometry and composition of ionizable fill. Embodiments herein generally employ a discharge vessel formed of a ceramic material having an aspect ratio satisfied by 1<ITL/ID<4.5 where ITL is the inner total length of the discharge vessel and ID is the inner diameter of the discharge vessel. The ionizable fill typically comprises xenon at a cold fill pressure of from about 3 to about 15 bar, and a halide component comprising sodium halide, thallium halide and/or indium halide, and at least one rare earth halide. Disclosed advantages may include betterment in both lumen run-up and color shift upon dimming, as compared to mercury-containing CMH HID lamps.

Abstract: A lamp having a ceramic arc envelope, an end structure coupled to the ceramic arc envelope and extending across an opening in the ceramic arc envelope, where the end structure comprises a passageway communicative with an interior chamber of the ceramic arc envelope is provided. The lamp further includes a molybdenum-rhenium electrode lead extending through and sealed with the passageway. The molybdenum-rhenium electrode lead includes a molybdenum-rhenium alloy. Furthermore, the lamp includes an arc electrode tip coupled to the electrode lead inside the interior chamber.

Abstract: A lamp having a ceramic arc envelope, an end structure coupled to the ceramic arc envelope and extending across an opening in the ceramic arc envelope, where the end structure comprises a passageway communicative with an interior chamber of the ceramic arc envelope is provided. The lamp further includes a molybdenum-rhenium electrode lead extending through and sealed with the passageway. The molybdenum-rhenium electrode lead includes a molybdenum-rhenium alloy. Furthermore, the lamp includes an arc electrode tip coupled to the electrode lead inside the interior chamber.