Hermetical lamp sealing techniques and lamp having uniquely sealed components

A lamp, comprising:

• a ceramic arc envelope;
• a cerment end member diffusion bonded, without an intermediate seal material, directly to the ceramic arc envelope to define a hermetical seal, wherein the hermetical seal comprises a ceramic material from both the ceramic arc envelope and the cerment end member;
• a ductile dosing tube coupled to the cerment end member to define a dosing passage into the ceramic arc envelope;
• and
• a lead wire extending through the dosing passage to an arc tip disposed inside the arc envelope, wherein a portion of the ductile dosing tube is compressed about the lead wire.

A lamp, comprising:

• a ceramic arc envelope;
• an end structure coupled to the ceramic arc envelope;
• a dosing tube coupled to the end structure, wherein the end structure comprises an end cap or an end plug;
• and
• wherein the ceramic arc envelope comprises alumina or yttrium-aluminum-garnet (YAG) and the end member comprises a molybdenum-zirconia cerment, wherein the ceramic arc envelope and the end member are thermally diffusion bonded together via diffusion of aluminum and zirconia across adjacent surfaces.