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US 8,569,952 B2Granted
Ceramic metal halide lamp having a high color temperature
AssigneeOsram Gesellschaft Mit Beschraenkter Haftung
InventorAndreas Genz
Life of this patent
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Abstract
In various embodiments, a high-pressure discharge lamp is provided. The high-pressure discharge lamp may include a ceramic discharge vessel which encloses a discharge volume, wherein a filling containing sodium halides, rare earth halides, mercury and inert gas is accommodated in the discharge volume, wherein the filling at the same time includes the rare earths Tm and Gd, the relative proportions between Gd and Tm, considered as a molar ratio, lying in the range 0.1 to 1.
Claims11
A high-pressure discharge lamp, comprising:
- a ceramic discharge vessel or a quartz glass vessel which encloses a discharge volume,
- wherein a filling containing sodium halides, rare earth halides, mercury and inert gas is accommodated in the discharge volume,
- wherein the filling at the same time includes the rare earths Tm and Gd, the relative proportions between Gd and Tm, considered as a molar ratio, lying in the range 0.1 to 1 wherein the color temperature is in the range from 5950 k to 6500 k.
Dependencies are inferred from the claim text.