Tunable white luminaire
First Claim
1. A tunable lighting system, comprising:
- a series connected string of a white light emitting semiconductor device and a first non-white color light emitting semiconductor device, the first non-white color of light being one of red, amber and orange;
a first driver connected for applying a controllable drive current to the series connected string of light emitting semiconductor devices to drive the white light emitting semiconductor device and the first non-white color light emitting semiconductor device together in common;
at least one second non-white color light emitting semiconductor device, the second non-white color of light being different from the first non-white color of light;
a second driver connected for applying a controllable drive current to the at least one second non-white color light emitting semiconductor device;
an input for receiving a user input relating to a selection of a spectral characteristic for a light output of the tunable lighting system; and
a microcontroller having a first control channel output connected to control the first driver and a second control channel output connected to control the second driver, wherein the microcontroller is configured to selectively operate the drivers via the control channel outputs in response to the received user input to cause combined light from the white and non-white light emitting semiconductor devices to produce the selected spectral characteristic for the light output of the tunable lighting system.
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Accused Products
Abstract
A system provides white light having a selectable spectral characteristic (e.g. a selectable color temperature and intensity) using a combination of sources (e.g. LEDs) emitting light of four, five, or six different characteristics, for example, one or more white LEDs, and one or more LEDs of each of three primary colors plus cyan and royal blue. A microcontroller can maintain a desired spectral characteristic, e.g. for white light at a selected point on or within a desired range of the black body curve. Further, the microcontroller provides tunability of the spectral characteristic and intensity of the white luminaire. One channel driver drives the one or more first color LEDs (white in our example) as well as the one or more second color LEDs which are connected in series to the first channel driver. The other light sources are each driven by separate drivers on separate channels.
35 Citations
38 Claims
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1. A tunable lighting system, comprising:
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a series connected string of a white light emitting semiconductor device and a first non-white color light emitting semiconductor device, the first non-white color of light being one of red, amber and orange; a first driver connected for applying a controllable drive current to the series connected string of light emitting semiconductor devices to drive the white light emitting semiconductor device and the first non-white color light emitting semiconductor device together in common; at least one second non-white color light emitting semiconductor device, the second non-white color of light being different from the first non-white color of light; a second driver connected for applying a controllable drive current to the at least one second non-white color light emitting semiconductor device; an input for receiving a user input relating to a selection of a spectral characteristic for a light output of the tunable lighting system; and a microcontroller having a first control channel output connected to control the first driver and a second control channel output connected to control the second driver, wherein the microcontroller is configured to selectively operate the drivers via the control channel outputs in response to the received user input to cause combined light from the white and non-white light emitting semiconductor devices to produce the selected spectral characteristic for the light output of the tunable lighting system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A substantially white luminaire, comprising:
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at least one light emitting diode (LED) configured to produce light of a first color, the first color being warm white; at least one LED configured to produce light of at least a second color, the at least second color being one of at least (i) red, (ii) amber, and (iii) orange; at least one LED configured to produce light of a third color; at least one LED configured to produce light of a fourth color; a first channel driver; a second channel driver; and a third channel driver; wherein the at least one LED configured to produce light of a first color and the at least one LED configured to produce light of at least the second color are coupled in series and driven by the first channel driver; wherein the at least one LED configured to produce light of a third color is driven by the second channel driver; and wherein the at least one LED configured to produce light of a fourth color is driven by a third channel driver. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of providing operating a tunable white luminaire, comprising:
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providing LED light of a first color; providing LED light of at least a second color; providing LED light of a third color; providing LED light of a fourth color; sensing and providing system performance measurements as feedback signals; receiving and processing the feedback signals; maintaining a desired spectral characteristic on a black body curve; tuning the spectral characteristic and intensity of the white luminaire; receiving and combining light of the first color, the at least second color, the third color, and the fourth color and creating a light of the desired spectral characteristic on the black body curve; driving the LED of the first color and the LED light of at least the second color via a single first channel; driving the LED of the third color via a second channel; and driving the LED of the fourth color via a third channel. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification