High efficacy metal halide lamp with praseodymium and sodium halides in a configured chamber
US6979958B2 · kind B2 · utility
5Cited by
17References
15Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jan 31, 2002 |
| Grant date | Dec 27, 2005 |
| Priority date | — |
| Expiry date | Nov 23, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/827
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An arc discharge metal halide lamp for use in selected lighting fixtures having a discharge chamber with light permeable ceramic walls of a selected shape about a discharge region of a selected volume. A pair of electrodes are supported in the discharge region separated from one another by a separation length. The separation length is in a ratio to the effective inner diameter that is greater than four. Ionizable materials are provided in the discharge region comprising a quantity of mercury in a ratio to the discharge region volume that is less than 4 mg/cm3, a noble gas, praseodymium halide, and sodium halide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.