Light emitting diode module with three part color matching
A light emitting diode module is produced using at least one LED and at least two selectable components that form a light mixing chamber. First and second selectable components have first and second types of wavelength converting materials with different wavelength converting characteristics. The first and second wavelength converting characteristics alter the spectral power distribution of the light produced by the LED to produce light with a color point that is a predetermined tolerance from a predetermined color point. Moreover, a set of LED modules may be produced such that each LED module has the same color point within a predetermined tolerance. The LED module may be produced by pre-measuring the wavelength converting characteristics of the different components selecting components with wavelength converting characteristics that convert the spectral power distribution of the LED to a color point that is a predetermined tolerance from a predetermined color point.
1. An illumination module comprising:
at least one light emitting diode operable to produce an amount of light with a spectral power distribution; and
a light mixing chamber configured to convert a portion of the amount of light emitted by the at least one light emitting diode to an amount of converted light, wherein the light mixing chamber includes an output port operable to output light including a portion of the amount of converted light, a first type of wavelength converting material having a first wavelength converting characteristic, and a second type of wavelength converting material having a second wavelength converting characteristic that is different from the first wavelength converting characteristic, the first type of wavelength converting material and the second type of wavelength converting material being located on a wavelength converting component that is physically separated from the at least one light emitting diode such that the first type of wavelength converting material and the second type of wavelength converting material are each in a direct optical path of the light emitted by the at least one light emitting diode;
wherein the first type of wavelength converting material and the second type of wavelength converting material are selected prior to final assembly of the illumination module such that the light that is output from the output port has a color point within a degree of departure Δu′v′ of 0.009 from a target color point in a CIE 1976 u′v′ diagram.
2. The illumination module of claim 1 , wherein the first type of wavelength converting material produces a color point shift along a first direction in a CIE 1976 u′v′ diagram in response to the amount of light produced by the at least one light emitting diode and the second type of wavelength converting material produces a color point shift along a second direction in the CIE 1976 u′v′ diagram in response to the amount of light produced by the at least one light emitting diode, wherein the first direction and the second direction are not parallel.
3. The illumination module of claim 1 , wherein the target color point is the color point of one of illuminant series D and a black-body radiator with a temperature of one of 2700K, 3000K, 3500K, 4000K, 4200K, 5000K, 6500K.
4. The illumination module of claim 1 , wherein an amount of the first type of wavelength converting material and an amount of the second type of wavelength converting material are selected based on a measured spectral power distribution of the at least one light emitting diode.
5. The illumination module of claim 1 , wherein the light mixing chamber is formed in a housing and the wavelength converting component is mounted to the housing.
6. The illumination module of claim 1 , wherein the light that is output from the output port has a color point within a degree of departure Δu′v′ of 0.0035 from a target color point in the CIE 1976 u′v′ diagram.
7. The illumination module of claim 5 , wherein the wavelength converting component is an output window.
8. An illumination module comprising:
at least one light emitting diode operable to produce an amount of light with a spectral power distribution; and
a light mixing chamber configured to convert a portion of the amount of light emitted by the at least one light emitting diode to an amount of converted light, wherein the light mixing chamber includes an output port operable to output light including a portion of the amount of converted light, a first type of wavelength converting material having a first wavelength converting characteristic, and a second type of wavelength converting material having a second wavelength converting characteristic that is different from the first wavelength converting characteristic, wherein the first and second types of wavelength converting materials are physically separated from the at least one light emitting diode and are each in a direct optical path of the light emitted by the at least one light emitting diode;
wherein an amount of the first type of wavelength converting material and an amount of the second type of wavelength converting material are selected such that the light that is output from the output port has a color point within a degree of departure Δu′v′ of 0.009 from a target color point in a CIE 1976 u′v′ diagram.
9. The illumination module of claim 8 , wherein the first type of wavelength converting material produces a color point shift along a first direction in a CIE 1976 u′v′ diagram in response to the amount of light produced by the at least one light emitting diode and the second type of wavelength converting material produces a color point shift along a second direction in the CIE 1976 u′v′ diagram in response to the amount of light produced by the at least one light emitting diode, wherein the first direction and the second direction are not parallel.
10. The illumination module of claim 8 , wherein the target color point is the color point of one of illuminant series D and a black-body radiator with a temperature of one of 2700K, 3000K, 3500K, 4000K, 4200K, 5000K, 6500K.
11. The illumination module of claim 8 , wherein an amount of the first type of wavelength converting material and an amount of the second type of wavelength converting material are selected based on a measured spectral power distribution of the at least one light emitting diode.
12. The illumination module of claim 8 , wherein the light mixing chamber is formed in a housing and the wavelength converting component is mounted to the housing.
13. The illumination module of claim 8 , wherein the light that is output from the output port has a color point within a degree of departure Δu′v′ of 0.0035 from a target color point in the CIE 1976 u′v′ diagram.
14. The illumination module of claim 12 , wherein the wavelength converting component is an output window.
15. An illumination module comprising:
at least one light emitting diode operable to produce an amount of light with a spectral power distribution; and
a light mixing chamber configured to convert a portion of the amount of light emitted by the at least one light emitting diode to an amount of converted light, wherein the light mixing chamber comprises:
an output port operable to output a portion of the amount of converted light; and
a first wavelength converting component for converting a first portion of the light with the spectral power distribution of the at least one light emitting diode to produce light with second spectral power distribution; and
a second wavelength converting component for converting a second portion of the light with the spectral power distribution of the at least one light emitting diode to produce light with a third spectral power distribution, the first type wavelength converting component and the second type of wavelength converting component being physically separated from the at least one light emitting diode are each in a direct optical path of the light emitted by the at least one light emitting diode wherein the second wavelength converting component is configured to be adjusted based on the light from the at least one light emitting diode combined with the light from the first wavelength converting component to adjust the light with the third spectral power distribution to produce combined light emitted from the output port from the light mixing chamber with a color point within a degree of departure Δu′v′ of 0.009 from a target color point in a CIE 1976 u′v′ diagram.
16. The illumination module of claim 15 , wherein
the first wavelength converting component converts the light produced by the at least one light emitting diode to produce a color point shift of a first magnitude along a first direction in a CIE 1976 u′v′ diagram; and
the second wavelength converting component converts the light produced by the at least one light emitting diode to produce a color point shift of a second magnitude along a second direction in the CIE 1976 u′v′ diagram, wherein the first direction and the second direction are not parallel, and wherein the first wavelength converting component and the second wavelength converting component are selectable to control the first magnitude and the second magnitude in response to the spectral power distribution of the at least one light emitting diode.
17. The illumination module of claim 16 , wherein at least one of the first wavelength converting component and the second wavelength converting component is an output window.
18. The illumination module of claim 16 , wherein a light mixing chamber is formed in a housing and at least one of the first wavelength converting component and the second wavelength converting component is mounted to the housing.
19. The illumination module of claim 16 , wherein the light that is output from the output port has a color point within a degree of departure Δu′v′ of 0.0035 from a target color point in the CIE 1976 u′v′ diagram.