High mercury density ceramic metal halide lamp
US7474057B2 · kind B2 · utility
1Cited by
25References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2005 |
| Grant date | Jan 6, 2009 |
| Priority date | — |
| Expiry date | Nov 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A low wattage mercury vapor lamp comprises a discharge vessel (10) including a tubular body (12), first and second electrodes (20, 22) and two end walls (16, 18), which close opposite ends of the tubular body. The discharge vessel contains an ionizable fill material having a concentration of mercury of from 0.10 to 0.20 mg/mm3. The discharge vessel operates at elevated pressures of from 80 to 170 atmospheres at power of 20 watts resulting in improved lumen maintenance and reduced through-life color shift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.