Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 11, 2007
0Patent Application Number
113113730
Date Filed
December 20, 2005
0Patent Primary Examiner
Patent abstract
When a discharge lamp is preheated, impedance of a filament electrode of the discharge lamp is computed. In accordance with the computed impedance, preheating and lighting of the discharge lamp are controlled.
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