Lighting system utilizing high intensity discharge lamps
Abstract
Abstract A lighting system is disclosed in which high intensity discharge lamps (e.g. mercury vapor lamps) are operated in combination with other lamps (e.g. incandescent lamps) to afford consistent and improved lighting. Somewhat-conventional ballast circuits are disclosed for energizing a high intensity discharge lamp in any of three states including warm-up, illumination and recovery. Another lamp is then included in the system, to be energized under the control of the potential developed across the high intensity discharge lamp, referenced to a base potential that is somewhat intermediate to the extreme levels developed across the discharge lamp during its various phases of operation, as provided by the ballast circuit. Embodiments with both autotransformer and dual winding transformer ballast circuits are disclosed, along with various sources of the intermediate base potential.
Inventors
- 👤 B Jones
Bibliographic Details
Claims Analysis
Total Claims: 11References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |