Metal halide lamp containing ScI.sub.3 with added cadmium or zinc
US4387319A · kind A · utility
13Cited by
6References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1981 |
| Grant date | Jun 7, 1983 |
| Priority date | — |
| Expiry date | Mar 30, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A high intensity metal halide discharge lamp has a fill comprising mercury, sodium iodide and scandium triiodide plus an inert starting gas. Cadmium or zinc may be added in a molar ratio relative to ScI.sub.3 within the range of 0.04 to 1.0 to achieve a lowering in color temperature of several hundred degrees Kelvin at the cost of a minor decrease in lumens which is offset by an improvement in maintenance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.