SODIUM-XENON LAMP WITH IMPROVED PROPERTY ON ENDING ITS LIFE

摘要

PROBLEM TO BE SOLVED: To provide an improved mercury-free high-pressure sodium lamp. SOLUTION: Sodium, xenon and zinc as an elemental metal additive is added to a high-pressure mercury-free sodium vapor lamp. The addition of the metal additive prevents an undesirable low-voltage operation mode for sodium-xenon discharge in relation to the mercury-free HPS lamp, generated when the sodium is no more related to arc discharged.