High-pressure mercury vapor discharge lamp
AssigneeU.S. Philips Corporation
InventorsHanns E. Fischer, Horst Horster
Life of this patent
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Abstract
A high-pressure mercury vapor discharge lamp whose envelope two tungsten electrodes disposed therein of tungsten and a filling containing a rare gas, a quantity of mercury larger than 0.2 mg/mm.sup.3 at a mercury a pour pressure of more than 200 bar and at least one of the halogens chlorine, bromine or iodine in a quantity between 10.sup.-6 and 10.sup.-4 .mu.mol/mm.sup.3. The wall load in operation is higher than 1 W/mm.sup.2.
Claims5
A high-pressure mercury vapor discharge lamp comprising a discharge envelope, a pair of discharge electrodes comprising tungsten between which a discharge is maintained during lamp operation, and a filling essentially consisting of mercury, a rare gas, and a halogen for maintaining a tungsten transport cycle during lamp operation, characterized in that:
- the quantity of mercury is larger than 0.2 mg/mm.sup.3, during lamp operation the mercury vapor pressure is higher than 200 bar and the wall load is higher than 1 W/mm.sup.2, and in that at least one of the halogens Cl, Br or I is present in a quantity between 10.sup.-6 and 10.sup.-4 .mu.mol/mm.sup.3.
Dependencies are inferred from the claim text.