Means for controlling lumen output in power consumption of phosphor excitable lamps
US4475064A · kind A · utility
Inventor
Key dates
| Filing date | Dec 11, 1981 |
| Grant date | Oct 2, 1984 |
| Priority date | — |
| Expiry date | Dec 11, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device and a method for reducing power consumption and correspondingly reducing lumen output of a phosphor excitable lamp, such as a fluorescent lamp, connected to a source of power for operation of the same, without any appreciable loss of operating efficiency. A load limiting arrangement, often referred to as a load limiting control device, and which generally includes a capacitive element is electrically connectable to one terminal of the phosphor excitable lamp. This device, when connected, is effectively electrically interposed between the lamp and the source of power in a series connection. The capacitive element is selected with a capacitive value so that the lumen output is reduced but with substantially uniform lumen output at the reduced level and the power consumption is reduced without substantially changing the voltage to the lamp and without any appreciable effects on the efficiency of operation of the lamp or the source of power. Further, when using the device and method, a circuit path is not created directly between the conductive terminal of the socket and the end terminal of the lamp, but rather through the capacitive element to thereby reduce the power consump…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.