# US 12,111,023 B2 · Tunable narrow-band light system having a high CRI across a wide CTT range

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- Number: US 12,111,023 B2
- Document ID: US12111023B2
- Status: Granted
- Kind: B2
- Application number: 18/278,355
- Filed: 2022-02-14
- Published: 2024-04-25
- Granted: 2024-10-08
- Earliest claimed: 2021-02-23
- Assignees: Signify Holding B.V.
- Applicants: Signify Holding B.V.
- Inventors: Marcel Petrus Lucassen; Martinus Petrus Joseph Peeters; Olexandr Valentynovych Vdovin
- Web page: https://patentgrep.com/patent/US12111023B2

## CPC

- F21K 9/64: using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
- F21K 9/65: specially adapted for changing the characteristics or the distribution of the light, e.g. by adjustment of parts
- F21V 23/0442: {activated by means of a sensor, e.g. motion or photodetectors}
- F21Y 2113/10: of different colours
- F21Y 2113/13: comprising an assembly of point-like light sources
- F21Y 2115/10: Light-emitting diodes [LED]
- F21Y 2115/30: Semiconductor lasers
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

The invention provides a light generating system (1000) configured to generate in an operational mode system light (1001) having a spectral power distribution with at least 85% of the spectral power in emission bands (111, 121, 131, 141) in four basic wavelength ranges of each at maximum 50 nm width, of which at least three of the four basic wavelength ranges are selected from a first wavelength range of 452 nm+/−25 nm, a second wavelength range of 504 nm+/−25 nm, a third wavelength range of 560 nm+/−25 nm, and a fourth wavelength range of 617.5 nm+/−25 nm, wherein the emission bands (111, 121, 131, 141) have full width half maxima of at maximum 30 nm.

## Claims

### Claim 1

A light generating system configured to generate in an operational mode system light having a spectral power distribution with at least 85% of the spectral power in emission bands in four basic wavelength ranges of each at maximum 50 nm width, wherein four basic wavelength ranges are selected from a first wavelength range of 452 nm+/−25 nm, a second wavelength range of 504 nm+/−25 nm, a third wavelength range of 560 nm+/−25 nm, and a fourth wavelength range of 617.5 nm+/−25 nm, wherein the emission bands have full width half maxima of at maximum 30 nm,
wherein the light generating system is further configured to generate the operational mode white system light having a correlated color temperature (CCT) between 2700-6500 K and having a color rendering index (CRI) of at least 90,
the light generating system comprising four sources of light configured to generate the emission bands,
wherein a first source of light is configured to generate the first emission band having a centroid wavelength selected from the wavelength range of 449-455 nm, wherein a fourth source of light is configured to generate the fourth emission band having a centroid wavelength selected from the wavelength range of 612-623 nm.

### Claim 2 (depends on 1)

The light generating system according to claim 1, wherein four of the four basic wavelength ranges are selected from the four basic wavelength ranges.

### Claim 3 (depends on 1)

The light generating system according to claim 1, wherein the four basic wavelength ranges are selected from a first wavelength range of 452 nm+/−15 nm, a second wavelength range of 504 nm+/−15 nm, a third wavelength range of 560 nm+/−15 nm, and a fourth wavelength range of 617.5 nm+/−15 nm.

### Claim 4 (depends on 1)

The light generating system according to claim 1, wherein the four wavelength ranges are selected from a first wavelength range of 452 nm+/−10 nm, a second wavelength range of 504 nm+/−12 nm, a third wavelength range of 560 nm+/−11 nm, and a fourth wavelength range of 617.5 nm+/−13 nm.

### Claim 5 (depends on 1)

The light generating system according to claim 1, wherein the light generating system is configured to generate in the operational mode system light having a spectral power distribution with at least 95% of the spectral power in the emission bands; and wherein the four wavelength ranges are selected from a first wavelength range of 452 nm+/−5 nm, a second wavelength range of 504 nm+/−5 nm, a third wavelength range of 560 nm+/−5 nm, and a fourth wavelength range of 617.5 nm+/−5 nm.

### Claim 6 (depends on 1)

The light generating system according to claim 1, comprising four sources of light configured to generate the emission bands.

### Claim 7 (depends on 1)

The light generating system according to claim 1, wherein one or more of the four sources of light comprise laser light sources.

### Claim 8 (depends on 1)

The light generating system according to claim 1, wherein one or more of the four sources of light comprise quantum structure based light sources.

### Claim 9 (depends on 1)

The light generating system according to claim 1, wherein one or more of the four sources of light comprise a light source selected from a LED, a phosphor converted LED, and a superluminescent diode, optionally in combination with first optics, wherein the first optics are configured to narrow the beam width of the respective source of light.

### Claim 10 (depends on 6)

The light generating system according to claim 6, wherein a the emission bands have full width half maxima selected from the range of 0.5-15 nm.

### Claim 11 (depends on 1)

The light generating system according to claim 1, further comprising second optics, configured to combine two or more beams of light of two or more of the four sources of light, and third optics configured downstream of the sources of light, wherein the third optics comprises a beam shaping element selected from the group of diffusors and collimators.

### Claim 12 (depends on 1)

The light generating system according to claim 1, further comprising a control system, wherein the control system is configured to control one or more of the spectral power distribution, the color rendering index, the color point, and the correlated color temperature of the system light.

### Claim 13 (depends on 12)

The light generating system according to claim 12, wherein the control system is configured to control one or more of the spectral power distribution, the color rendering index, and the color point, of the system light while maintaining the correlated color temperature within a range of 2700-6500 K.

### Claim 14 (depends on 12)

The light generating system according to claim 12, wherein the control system is configured to control one or more of the spectral power distribution, the color rendering index, the color point, and the correlated color temperature of the system light in dependence of a sensor signal of a sensor, wherein the sensor comprises an optical sensor.

### Claim 15 (depends on 1)

A light generating device selected from the group of a lamp, a luminaire, a projector device, comprising the light generating system according to claim 1.