Solid state lighting devices including light mixtures
First Claim
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1. A solid state lighting apparatus comprising:
- a first plurality of light emitting diodes (LEDs), each of the first plurality of LEDs comprising an LED device configured to emit light having about a first dominant wavelength and a phosphor configured to receive at least some of the light emitted by the LED device and responsively emit light having a second dominant wavelength; and
a second plurality of LEDs configured to emit light having about a first color point,wherein a combined light emitted by the LED device and the phosphor of a first one of the first plurality of LEDs has a second color point and a combined light emitted by the LED device and the phosphor of a second one of the first plurality of LEDs has a third color point that falls outside a seven step Macadam ellipse around the second color point; and
wherein a combined light emitted by the first plurality of LEDs and the second plurality of LEDs has a fourth color point that falls within a ten-step Macadam ellipse around any point on the planckian locus between 2000 Kelvin and 8000 Kelvin.
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Abstract
A solid state lighting apparatus includes a plurality of light emitting diodes (LEDs). Each of the LEDs includes an LED device configured to emit light having about a first dominant wavelength and a phosphor configured to receive at least some of the light emitted by the LED device and responsively emit light having about a second dominant wavelength. A combined light emitted by the LED device and the phosphor of a first one of the plurality of LEDs has a first color point and a combined light emitted by the LED device and the phosphor of a second one of the plurality of LEDs has a second color point that falls outside a seven step Macadam ellipse around the first color point.
179 Citations
16 Claims
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1. A solid state lighting apparatus comprising:
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a first plurality of light emitting diodes (LEDs), each of the first plurality of LEDs comprising an LED device configured to emit light having about a first dominant wavelength and a phosphor configured to receive at least some of the light emitted by the LED device and responsively emit light having a second dominant wavelength; and a second plurality of LEDs configured to emit light having about a first color point, wherein a combined light emitted by the LED device and the phosphor of a first one of the first plurality of LEDs has a second color point and a combined light emitted by the LED device and the phosphor of a second one of the first plurality of LEDs has a third color point that falls outside a seven step Macadam ellipse around the second color point; and wherein a combined light emitted by the first plurality of LEDs and the second plurality of LEDs has a fourth color point that falls within a ten-step Macadam ellipse around any point on the planckian locus between 2000 Kelvin and 8000 Kelvin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A solid state lighting apparatus comprising:
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first and second current sources; and a first string of light emitting diodes (LEDs) connected to the first current source and configured to emit light in response to a drive current supplied by the first current source, each of the LEDs in the string comprising an LED device configured to emit light having a first dominant wavelength and a phosphor configured to receive at least some of the light emitted by the LED device and responsively emit light having a second dominant wavelength that is different from the first dominant wavelength wherein each of the plurality of LED devices in the first string emits substantially the same color of light and each of the plurality of LEDs in the string comprises the same phosphor; a second string of light emitting diodes (LEDs) connected to the second current source and configured to emit light in response to a drive current supplied by the second current source, wherein each of the LEDs in the second string is configured to emit light having about a first color point, wherein a combined light emitted by the LED device and the phosphor of a first one of the first plurality of LEDs has a second color point and a combined light emitted by the LED device and the phosphor of a second one of the first plurality of LEDs has a third color point that falls outside a seven step Macadam ellipse around the second color point; and wherein a combined light emitted by the first plurality of LEDs and the second plurality of LEDs has a fourth color point that falls within a ten-step Macadam ellipse around any point on the planckian locus between 2000 Kelvin and 8000 Kelvin.
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15. A solid state lighting apparatus comprising:
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a first plurality of light emitting diodes (LEDs), each of the first plurality of LEDs comprising an LED device configured to emit light having about a first dominant wavelength and a first phosphor configured to receive at least some of the light emitted by the LED device and responsively emit light having a second dominant wavelength; and a second plurality of LEDs, each of the second plurality of LEDs comprising an LED device configured to emit light having a third dominant wavelength and a second phosphor configured to receive at least some of the light emitted by the LED device and responsively emit light having a fourth dominant wavelength; wherein a combined light emitted by the LED device and the first phosphor of a first one of the first plurality of LEDs has a first color point and a combined light emitted by the LED device and the phosphor of a second one of the first plurality of LEDs has a second color point that falls outside a seven step Macadam ellipse around the first color point; and wherein a combined light emitted by the LED device and the second phosphor of a first one of the second plurality of LEDs has a third color point and a combined light emitted by the LED device and the second phosphor of a second one of the second plurality of LEDs has a fourth color point that falls outside a seven step Macadam ellipse of the third color point. - View Dependent Claims (16)
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Specification