Study for the Sodium-Loss Locations of High Pressure Sodium Lamp

摘要

References(7) Cited-By(1) From the point of suppressing the increase of lamp voltage and making longer stable life performance of the high pressure sodium lamp, it is important to suppress the reaction of sodium in the arc tube of high pressure sodium lamp during operation. We made the inquiry for the sodium distribution after the long burned lamps. As the result of analysis with arc tubes of high pressure sodium lamp, the reaction of poly crystalline alumina is under 0.1 mg with the wall temperature being the wall temperature kept under 1,100 degree Centigrade after the burning of over 20,000 hours, regardless of electrode constructions. And sodium loss is mainly caused with the sealing frit. It will be requested to raise up the tolerance of sodium for the frit.