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| Number | Title | Issue Date |
| 4999547 | Ballast for high pressure sodium lamps having constant line and lamp wattage A high efficiency, electronic ballast is taught for high pressure sodium (HPS) lamps. The ballast is powered by AC line current which is rectified so that 160 volts of direct current lights the lamp. The ballast maintains constant wattage to the lamp and ... | 03/12/1991 |
| 4686428 | High intensity discharge lamp self-adjusting ballast system with current limiters and a current feedback loop The invention comprises a self-adjusting ballast system for a high intensity discharge lamp. The ballast has a current limiter which modifies the lamp's present duty cycle to prevent damage if bulb rectification or another overcurrent condition occurs. It... | 08/11/1987 |
| 4682084 | High intensity discharge lamp self-adjusting ballast system sensitive to the radiant energy or heat of the lamp A self-adjusting ballast system for a high intensity discharge lamp. A lightweight, inexpensive and efficient ballast controls the strike and warmup stages of the high intensity discharge lamp, in particular high wattage lamps, through direct sensing of t... | 07/21/1987 |
