Patent ID: 7344427
Filing Date: 2008-03-18
Classification: H01J

Abstract:
1. A method for the design and construction of a discharge lamp having a power range of about 150 W to about 1000 W and comprising a ceramic discharge vessel enclosing a discharge space, said discharge vessel including within said discharge space an ionizable material comprising a metal halide mixture, a first and second discharge electrode feedthrough means, and a first and second current conductor connected to said first and second discharge electrode feedthrough means, respectively; which method comprises the steps of determining the dimensions of the arc tube of the discharge vessel and the electrode feedthrough means structure using a design space of parameters comprising at least one of the following parameters: (i) the arc tube length, diameter and wall thickness limits of said discharge lamp correlated to and expressed as functions of lamp power, and/or color temperature, and/or lamp voltage; and (ii) the electrode feedthrough structure limits used to conduct electrical currents with minimized thermal stress on the arc tube correlated to and expressed as a function of lamp current; and the metal halide mixture comprises the following salts of 6-25 wt % NaI, 5-6 wt % TlI, 34-37 wt % CaI