WHITE LIGHT COLOR CHANGING SOLID STATE LIGHTING AND METHODS
First Claim
1. A solid state lighting (SSL) luminaire, comprising:
- a plurality of first light emitting diodes (LEDs);
a plurality of second light emitting diodes emitting light with characteristics different from the first LEDs; and
a current control mechanism to control the intensity of light from said first and second LEDs, said controller capable of changing the emission intensity of said first and second LEDs so that said SSL luminaire emits light having desired characteristics.
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Abstract
Solid state lighting (SSL) luminaries are disclosed wherein the emission intensity of discrete light sources within the SSL luminaire can be varied to produce luminaire light having different characteristics. The present invention can utilize the unique circuit topology of SSL luminaires to vary the emission intensity of different types of LEDs in the luminaire. In some embodiments, the different types of LEDs are connected in respective serial strings, and the intensity of emission of the LEDs in each of the strings can be varied by changing the electrical signal driving the strings. In some of these embodiments, white light is emitted from the SSL luminaire by combining emission from BSY and red LEDs. For these embodiments the color changing solutions according to the present invention can include, as an example, changing color while dimming the luminaire, changing color between daytime and nighttime modes, and changing between most efficient and points in between.
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Citations
32 Claims
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1. A solid state lighting (SSL) luminaire, comprising:
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a plurality of first light emitting diodes (LEDs); a plurality of second light emitting diodes emitting light with characteristics different from the first LEDs; and a current control mechanism to control the intensity of light from said first and second LEDs, said controller capable of changing the emission intensity of said first and second LEDs so that said SSL luminaire emits light having desired characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A solid state lighting SSL luminaire, comprising:
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a plurality of first blue shifted yellow (BSY) light emitting diodes (LEDs); a plurality of second BSY LEDs emitting light with different characteristics than said first BSY LEDs; and a plurality of red LEDs, wherein the relative emission intensities of the first, second and third LEDs can be varied such that said SSL luminaire emits a combination of light from said first, second and third LED with desired lighting characteristics. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A solid state lighting (SSL) luminaire, comprising:
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a plurality of serially connected first light emitting diodes (LEDs); a plurality of serially connected second LEDs; and a plurality of serially connected third LEDs, said first, second and third LEDs having different emission characteristics, wherein the relative emission intensities of the first, second and third LEDs can be varied such that said SSL luminaire can be controlled to emit light with different lighting characteristics. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A solid state lighting (SSL) luminaire, comprising:
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a plurality of first light emitting diodes (LEDs); and a plurality of second LEDs emitting light with characteristics different from the first LEDs, wherein the intensity of light from said first and second LEDs can be controlled so that said SSL luminaire produces a dominant emission from one of said first and second LEDs in response to changing lighting conditions. - View Dependent Claims (32)
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Specification