Optical integrating chamber lighting using one or more additional color sources to adjust white light
First Claim
1. A lighting apparatus, for a visible illuminating type lighting application, to illuminate or to provide task or object illumination in a region or area intended to be occupied by a person, the apparatus comprising:
- a first source of light of a first wavelength;
a second source of light of a second wavelength, the second wavelength being different from the first wavelength;
a third source of light, wherein the third source produces substantially white light; and
an optical integrating cavity having a diffusely reflective interior surface for receiving and integrating light of the first and second wavelengths and the substantially white light, from the sources of light, via multiple diffuse reflections from the reflective interior surface, to form white light of a desired spectral characteristic, and having an aperture for allowing emission of the white light of the desired spectral characteristic in a direction to facilitate said visible illuminating type lighting application.
1 Assignment
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Accused Products
Abstract
A system provides white light having a selectable spectral characteristic (e.g. a selectable color temperature) using an optical integrating cavity to combine energy of different wavelengths from different sources with white light. The cavity has a diffusely reflective interior surface and an aperture for allowing emission of combined light. Control of the intensity of emission of the sources sets the amount of primary color light of each wavelength added to the substantially white input light output and thus determines a spectral characteristic of the white light output through the aperture. A variety of different elements may optically process the combined light output, such a deflector, a variable iris, a lens, a variable focusing lens system, a collimator, a holographic diffuser and combinations thereof.
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Citations
63 Claims
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1. A lighting apparatus, for a visible illuminating type lighting application, to illuminate or to provide task or object illumination in a region or area intended to be occupied by a person, the apparatus comprising:
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a first source of light of a first wavelength; a second source of light of a second wavelength, the second wavelength being different from the first wavelength; a third source of light, wherein the third source produces substantially white light; and an optical integrating cavity having a diffusely reflective interior surface for receiving and integrating light of the first and second wavelengths and the substantially white light, from the sources of light, via multiple diffuse reflections from the reflective interior surface, to form white light of a desired spectral characteristic, and having an aperture for allowing emission of the white light of the desired spectral characteristic in a direction to facilitate said visible illuminating type lighting application. - View Dependent Claims (2, 6, 9, 10, 11, 12, 13, 14, 15)
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3-5. -5. (canceled)
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7-8. -8. (canceled)
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16-25. -25. (canceled)
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26. A lighting apparatus, for a white light illuminating type application, to illuminate or to provide task or object illumination in a region or area intended to be occupied by a person, the apparatus comprising:
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a chamber having at least one diffusely reflective interior surface for combining at least some light by diffuse reflection within the chamber and having an optical passage for allowing emission of combined light from the chamber in a direction to facilitate said white light illuminating type application; a first source for producing substantially white light, the first source being coupled to supply the substantially white light to the interior of the chamber; a second source for producing light of a defined wavelength, the second source being coupled to supply the light of the defined wavelength to the interior of the chamber, so that the emission of combined light from the chamber is white light of a spectral characteristic determined by a combination of the substantially white light and the light of the defined wavelength; and a control circuit coupled to the sources for establishing output intensity of light of each of the sources to set contributions of the substantially white light and the light of the defined wavelength to the combined light and thus set the spectral characteristic of the combined white light emitted through the optical passage of the chamber. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A downlight for a white lighting application, the downlight comprising:
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a chamber having at least one diffusely reflective interior surface for combining at least some light by diffuse reflection within the chamber and having an optical passage for allowing emission of combined light from the chamber in a downward direction to facilitate said white light application for the downlight; at least one white light emitting diode (LED) coupled directly to the chamber, for producing substantially white light; at least one single-colored light emitting diode (LED) coupled directly to the chamber, for producing a single color of light, so that the emission of combined light from the optical passage of the chamber is white light of a spectral characteristic determined by a combination of the substantially white light and the single color of light; and a control circuit coupled to the LEDs for establishing output intensity of light of each of the LEDs to set contributions of the substantially white light and the light of the single color to the combined light and thus set the spectral characteristic of the combined white light emitted through the optical passage of the chamber for said white lighting application for the downlight. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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Specification