Metal halide lamp having open tungsten coil electrodes

Details Metal halide lamp having open tungsten coil electrodes Metal halide lamp having open tungsten coil electrodes

H - Electricity

01

J

313/10, 313/132,

H01J 61/06 (2006.01) H01J 61/073 (2006.01) H01J 61/18 (2006.01)

Patent

CA 1071685

ABSTRACT OF THE DISCLOSURE In a metal halide lamp of the sodium-scandium-thorium iodide type utilizing tungsten electrodes without emission mix, lumen depreciation during life results primarily from blacken- ing of the arc tube wall by electrode sputtering during the glow-to-arc transition phase of lamp start-up. The glow-to- arc transition is speeded up by a lower glow-to-arc transition voltage which is achieved by using electrodes comprising an open tungsten wire coil on a tungsten shank, the coil comprising two layers of a composite wire made by open-winding a 2 mil overwind on a 4 mil core and then close-winding two layers of the composite wire on the shank. This decreases sputtering at at starting and improves lamp maintenance.

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