SYSTEMS AND METHODS FOR CONTROLLING SOLID STATE LIGHTING DEVICES AND LIGHTING APPARATUS INCORPORATING SUCH SYSTEMS AND/OR METHODS
First Claim
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1. A lighting apparatus comprising:
- a string of serially-connected light-emitting diodes (LEDs) coupled between first and second terminals and comprising a first set of LEDs having a first chromaticity and a second set of LEDs having a second chromaticity different from the first chromaticity; and
a control circuit operatively coupled to the string and configured to vary a color temperature produced by the string responsive to a variation in a total current passing between the first and second terminals.
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Abstract
A lighting apparatus includes at least two sets of light-emitting devices with overlapping spectra and different chromaticities, such as two sets of blue-shifted yellow (BSY) LEDs producing outputs with different yellow content. The devices may be selectively controlled, e.g., by using selective current bypass circuits, to provide a desired color temperature or other visual performance in response to a dimming control input such that, for example, a light output approximating that of an incandescent lamp may be achieved.
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Citations
40 Claims
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1. A lighting apparatus comprising:
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a string of serially-connected light-emitting diodes (LEDs) coupled between first and second terminals and comprising a first set of LEDs having a first chromaticity and a second set of LEDs having a second chromaticity different from the first chromaticity; and a control circuit operatively coupled to the string and configured to vary a color temperature produced by the string responsive to a variation in a total current passing between the first and second terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A lighting apparatus comprising:
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a plurality of light-emitting devices comprising at least one red light-emitting device, at least one BSY light-emitting device having a first BSY output and at least one BSY light-emitting device having a second BSY output with a greater yellow content than the first BSY output; and a control circuit operatively coupled to the plurality of light-emitting devices and configured to cause a color temperature produced by the plurality of light-emitting devices to vary substantially in conformance with the Planckian locus in response to a dimming control input. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A lighting apparatus comprising:
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a plurality of light-emitting devices comprising light-emitting devices having at least three different chromaticities; and a control circuit operatively coupled to the plurality of light-emitting devices and configured to cause a color temperature produced by the plurality of light-emitting devices to vary in response to a dimming control input over a range from about 5000K to about 2000K while maintaining a color rendering index (CRI) greater than about 80%. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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36. A lighting apparatus comprising:
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a plurality of light-emitting devices comprising first and second sets of light-emitting devices having substantially overlapping output spectra and chromaticities falling within respective first and second different chromaticity ranges; and a control circuit operatively coupled to the plurality of light-emitting devices and configured to differentially operate the first and second sets of light-emitting devices in response to a dimming control input. - View Dependent Claims (37, 38, 39, 40)
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Specification