High efficacy pulsed, dimmable high pressure cesium lamp
US6441564B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 2000 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Dec 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/3928
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dimmable electrical discharge lamp providing radiation and having a CRI of over 90 and a color temperature of between about 3000-4000° K even when dimmed by up to 40% of its rated power. The lamp contains a fill of a mixture of cesium, mercury and a rare gas. The fill is enclosed in a hermetically sealed polycrystalline alumina arc tube having an electrode at each end and the arc tube is enclosed in an outer jacket. The lamp is provided with a circuit for providing current to the arc tube. A low frequency wave simmer current is provided and one or more current pulses are superimposed on the simmer current. The gradient of the leading edge of the pulse is short whereby to generate a high electrical field and cause a high degree of ionization of the cesium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.