Dimmable metal halide lamp and lighting method
US7138766B2 · kind B2 · utility
4Cited by
7References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2004 |
| Grant date | Nov 21, 2006 |
| Priority date | — |
| Expiry date | Aug 13, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/125
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A metal halide lamp in which an arc tube is housed within a bulb having a base at one end thereof. The arc tube includes a main tube, two thin tubes that extend one from each end of the main tube, and a pair of electrode inductors. The main tube and the thin tubes are made from translucent polycrystalline alumina and constitute a discharge vessel having a discharge space therein. Lamp power under dimming conditions is set in a range defined by maximum lamp power Wmax [W] and minimum lamp power Wmin [W], with a surface area S [cm2] of the inner surface of the discharge vessel satisfying Wmax/60≦S≦Wmin/20.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.