Ac high pressure discharge lamp, especially for high current...

Details Ac high pressure discharge lamp, especially for high current... Ac high pressure discharge lamp, especially for high current...

H - Electricity

01

J

313/167

H01J 17/52 (2006.01) H01J 61/073 (2006.01)

Patent

CA 2008646

ABSTRACT OF THE DISCLOSURE To prevent the formation of melt-back slugs or granules on electrodes of high pressure, high power discharge lamps, when the lamps are operated under alternating current conditions of between about 20 to 60 A, for example, the electrodes are terminated in regions of decreasing diameter and, in accordance with the invention, comprise tungsten doped with lanthanum oxide (La203) between about 0.5 to 2%, by weight, preferably about 1%. The doping intensity may increase towards the inside region of the electrode.

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