# US 8,569,952 B2 · Ceramic metal halide lamp having a high color temperature

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- Number: US 8,569,952 B2
- Document ID: US8569952B2
- Status: Granted
- Kind: B2
- Application number: 13/127,498
- Filed: 2009-10-26
- Published: 2011-08-25
- Granted: 2013-10-29
- Earliest claimed: 2008-11-06
- Assignees: Osram Gesellschaft Mit Beschraenkter Haftung
- Applicants: Andreas Genz
- Inventors: Andreas Genz
- Web page: https://patentgrep.com/patent/US8569952B2

## CPC

- H01J 61/827: {Metal halide arc lamps}
- H01J 61/125: {having an halogenide as principal component}
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The high-pressure discharge lamp as claimed in claim 1,
wherein the relative proportions lie between 0.2 and 0.8, marginal values included.

### Claim 3 (depends on 1)

The high-pressure discharge lamp as claimed in claim 1,
wherein the halide is at least one of iodine and bromine, and
wherein at least one of xenon and argon is used as the inert gas.

### Claim 4 (depends on 1)

The high-pressure discharge lamp as claimed in claim 1,
wherein the metal halides additionally have at least one of Ho and Pr as rare earths, each at max. 10 mol %.

### Claim 5 (depends on 1)

The high-pressure discharge lamp as claimed in claim 1,
wherein halides of at least one of In and TI are used in addition as metal halides.

### Claim 6 (depends on 1)

The high-pressure discharge lamp as claimed in claim 1,
wherein the content of Hg is in the range of 1 to 20 mg/cm3.

### Claim 7 (depends on 1)

The high-pressure discharge lamp as claimed in claim 1,
wherein the molar ratio between the sum of all rare earths and Na is in the range 0.2 to 5.

### Claim 8 (depends on 1)

The high-pressure discharge lamp as claimed in claim 1,
wherein the lamp has a color rendering index of at least 80.

### Claim 9 (depends on 1)

The high-pressure discharge lamp as claimed in claim 1,
wherein the lamp has a light yield of at least 90 lm/W.

### Claim 10 (depends on 3)

The high-pressure discharge lamp as claimed in claim 3,
wherein the halide is at least one of iodine and bromine with max. 50 mol % bromine.

### Claim 11 (depends on 7)

The high-pressure discharge lamp as claimed in claim 7,
wherein the molar ratio between the sum of all rare earths and Na is in the range 0.3 to 3.