Metal halide discharge lamp containing a sodium getter
AssigneeGeneral Electric Company
InventorsTimothy D. Russell, Raymond A. Heindl
Life of this patent
Estimating the term…
Abstract
Sodium metal has been found to be effective in gettering excess halogen present in metal halide lamps containing mercury, an inert starting gas and at least one ionizable metal halide for forming a light-emitting arc.
Claims11
A metal halide arc discharge lamp comprising a light-transmissive arc chamber hermetically sealed and containing within a fill comprising sodium metal, mercury metal, a starting gas and at least one ionizable metal halide, wherein said sodium metal is present in an amount sufficient to getter any excess halogen initially present in said arc chamber and wherein said amount of sodium metal present initially ranges between 1 to 5 mole % of the total amount of said mercury metal and said sodium metal.
A metal halide arc discharge lamp comprising a light-transmissive fused quartz arc chamber hermetically sealed and including within a pair of spaced apart electrodes and a fill comprising sodium metal, mercury metal, a starting gas and at least one ionizable metal halide for forming a light-emitting arc, wherein said sodium metal is present in said arc chamber in an amount sufficient to getter any excess halogen and other impurities initially present in said arc chamber and wherein said amount of sodium metal present initially ranges between 1 to 5 mole % of the total amount of said mercury metal and said sodium metal.
Dependencies are inferred from the claim text.