Patent ID: 6853119

Claim:
An electrode coil for a HID lamp, comprising: a tungsten core with a free end adapted to be placed in a HID tube; a first coil on said tungsten core, said first coil comprising a first wire wrapped in a first direction with each turn of said first wire touching another turn of said first wire, said first coil having an exterior surface with a helical groove therein, said free end of said tungsten core being adjacent to but spaced from a corresponding end of said first coil, an exterior of said tungsten core touching an interior of said first coil; and a second coil on said first coil, said second coil comprising a second wire wrapped in the first direction directly on said first wire in said helical groove whereby the interior of said second coil touches the exterior of said first coil, a first turn of said second wire touching a first turn of said first wire and a last turn of said second wire touching a last turn of said first wire, each turn of said second wire touching two turns of said first wire 36 .