Mercury-metal halide discharge lamp
US4247798A · kind A · utility
7Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1979 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Apr 3, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Metal halide discharge lamps based on sodium and scandium iodides show improved color rendering without important loss of efficacy by the inclusion of lithium iodide, especially in the molar proportion of 10-50% LiI based on the total of Li, Na and Sc iodides. The ratio of alkali metal of SC iodides should be between 5.4:1 and 57.5:1. Especially preferred are lamps with less than 10 molar % ScI and the lamps may additionally contain caesium iodide to broaden the emission spectrum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.