Patent ID: 8450932

Claim:
A high pressure sodium lamp, comprising: a lamp base for electrically connecting to an external AC power source; and a light admissible housing provided on said lamp base and defines a lamp cavity within said light admissible housing; and a sodium vapor illumination arrangement, which comprises: a light core extended from said lamp base into said light admissible housing; a supporting frame longitudinally extended in said light admissible housing, wherein said supporting frame has an upper end portion supported by an upper portion of said light admissible housing, and a lower end portion supported by said light core; and an arc tube which is made by aluminum oxide ceramic, and has a first and a second electrode formed at two ends thereof and electrically connected with said upper end portion of said supporting frame and said light core respectively, wherein said arc tube is filled with sodium vapor such that when said lamp base is electrically connected with an external AC power source, said sodium vapor in said arc tube is electrically excited to discharge light having an intensity equivalent to that generated by more than 1000 W power.