Starting arrangement for high pressure discharge sodium lamp

Details Starting arrangement for high pressure discharge sodium lamp Starting arrangement for high pressure discharge sodium lamp

H - Electricity

01

J

313/10, 313/125,

H01J 61/54 (2006.01) H01J 7/30 (2006.01)

Patent

CA 1124303

19 48,013 ABSTRACT OF THE DISCLOSURE High-pressure-discharge (HID) sodium lamp has a starting aid comprising a plug-like ceramic member extend- ing through the longitudinal wall of the arc tube proximate one of the lamp electrodes. The plug-like ceramic member is fused to the alumina arc tube and is electrically conduc- tive by virtue of having embedded therein a small percen- tage of finely divided refractory metal. At least during lamp starting, the plug-like ceramic starting aid is elec- trically connected through a resistor to the opposite lamp electrode and, as a result, on application of energizing potential, a glow discharge is established between the interior surface of the plug-like ceramic member and the proximate lamp electrode to ionize the atmosphere within the arc tube to facilitate lamp starting.

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