Intensity balance for multiple lamps
AssigneeLeviton Manufacturing Co., Inc.
InventorJaiganesh Balasubramanian
Life of this patent
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Abstract
A compensation system includes first and second sensors to determine the intensities of first and second fluorescent lamps, a compensator to control the intensity of the first lamp, and a controller to adjust the intensity of the first lamp to about the same intensity as the second lamp. The lamps may be coupled in series, and the compensator may be arranged to divert current around or way from one of the lamps.
Claims33
A system comprising:
- a first sensor to determine the intensity of a first fluorescent lamp;
- a second sensor to determine the intensity of a second fluorescent lamp;
- a compensator to control the intensity of the first lamp;
- and
- a controller coupled to the first and second sensors and the compensator to adjust the intensity of the first lamp to about the same intensity as the second lamp.
A method comprising:
- sensing the intensity of a first fluorescent lamp;
- sensing the intensity of a fluorescent second lamp;
- compensating the first lamp to adjust the intensity of the first lamp to about the same intensity as the second lamp.
A ballast comprising:
- one or more power sources to operate a first lamp and a second lamp;
- a first sensor to determine the intensity of the first lamp;
- a second sensor to determine the intensity of the second lamp;
- a compensator to control the intensity of the first lamp;
- and
- a controller coupled to the first and second sensors and the compensator to adjust the intensity of the first lamp to about the same intensity as the second lamp.
The ballast of claim 30 where the first, second and third sets of conductors each comprise two conductors to provide power to filaments.
A method for retrofitting a light fixture, the method comprising:
- installing a first sensor in the fixture to determine the intensity of a first lamp in the fixture;
- installing a second sensor to determine the intensity of a second lamp in the fixture;
- coupling a compensator to a conductor for the first lamp;
- installing a controller to control the compensator to adjust the intensity of the first lamp to about the same intensity as the second lamp.
Dependencies are inferred from the claim text.