Patent ID: 8766518

Claim:
A high intensity discharge lamp comprising: an electrically insulating arc tube comprised of light transmissive material having a central portion and two legs each of which extends from said central portion, said central portion forming an interior discharge region; electrical conductors each extending through one of said legs and being spaced apart from each other in said discharge region; a sealed shroud comprised of light transmissive material enclosing said arc tube and electrical connection to said electrical conductors through said sealed shroud; an electrically conductive frame member disposed in an interior of said shroud that is electrically connected to one of said electrical conductors; an ignition aid comprising electrically conductive foil that is fastened to said frame member and forms a closed loop that encircles one of said legs of said arc tube around one of said electrical conductors, wherein said foil encircles said leg by a range of at least 270 degrees to 360 degrees; and wherein said foil includes two end portions, and a central portion therebetween that encircles said arc tube leg, a first said end portion of said foil being connected to said frame member and a second said end portion of said foil being connected to said foil between said central portion and said first end portion of said foil.