Mercury free metal halide lamp

Details Mercury free metal halide lamp Mercury free metal halide lamp

2007-05-15

2007-05-15

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

C313S620000

Reexamination Certificate

active

10526200

ABSTRACT:
A Hg-free metal halide lamp comprising a substantially cylindrical discharge vessel with a ceramic wall having an internal diameter Di, an internal length Li and a wall thickness Wt, and filled with an ionizable filling, wherein two electrodes are present having a mutual distance EA for maintaining a discharge in the discharge vessel, wherein the filling comprises an inert gas and a salt, wherein the internal length Li is smaller than 8 mm, wherein the electrode distance EA and the internal diameter Di comply with the relation EA/Di>;2, wherein the inert gas pressure PXe at room temperature is at least 5 bar, and wherein the wall thickness Wt and the internal diameter Di comply with the relation Wt/Di>0.15.

REFERENCES:
patent: 4161672 (1979-07-01), Cap et al.
patent: 5144201 (1992-09-01), Graham et al.

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