High-power, high-pressure metal halide discharge lamp with improved spectral light distribution
Abstract
Abstract To increase the power output of a high-pressure metal halide discharge lampaving a fill of mercury and at least one noble gas, and rare-earth halides which include at least one of: holmium; dysprosium, preferably present, each, of from 0.01 to 2.4 mg/cm 3 of the discharge vessel, a gadolinium halide, present of from 0.01 to 2.3 mg/cm 3 of the discharge vessel is additionally included in the fill. The discharge vessel is made of quartz, the electrodes of tungsten, and, in an example, a lamp operating at 12 kW, with 380 V power supply at 65 A is obtainable, the light output being comparable to that of daylight based on CIE standard D 60, with a color temperature of 6000° K. so that an overall color temperature of about 5600° K. is obtainable when the lamp is installed in a customary fixture, for example used in theatrical, film or television illumination application. The preferred halogens are bromium and/or iodine, in which the halogen is present in excess over the rare-earth - halide stoichiometric relationship. The specific arc power obtainable is between 1000 to 5000 W/cm, with a wall loading of between 50 to 120 W/cm 2 .
Inventors
- 👤 Alexander Dobrusskin
- 👤 Bernd Lewandowski
- 👤 Walter Kiele
Bibliographic Details
Claims Analysis
Total Claims: 5References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |