Iodine getter for a high intensity metal halide discharge lamp

Details Iodine getter for a high intensity metal halide discharge lamp Iodine getter for a high intensity metal halide discharge lamp

1993-07-16

1994-08-30

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

313638, 313161, 313562, 315248, H01J 1720, H01J 6118

Patent

active

053431189

ABSTRACT:
A high intensity discharge lamp having a fill including at least one rare earth metal iodide has an additional metal component for avoiding a substantial loss of the metal component of the fill and the attendant substantial buildup of free iodine, thereby increasing the useful life of the lamp. During lamp operation, the additional metal component combines with iodine in the vapor phase, forming a relatively stable iodide and thus reducing the total level of free iodine in the lamp. As a result, arc instability is avoided. The additional metal component also emits visible light and hence improves efficacy. Moreover, the additional metal component does not attack the arc tube wall by reducing silica. Suitable additional metal components include indium and thallium.

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