White AC LED
A multi-color white LED which can be driven by a single current, and more particularly, to the use of a specific ratio of numbers of different color LEDs to obtain a specific desired color while running all of them at the same current.
1. An LED light source comprising:
a first set of LEDs, the first set comprising one or more LEDs of a first color; and
a second set of LEDs, the second set comprising one or more LEDs of a second color,
wherein the first color and the second color are different,
wherein the number of LEDs in the first set has a ratio to the number of LEDs in the second set, the ratio selected based on the amount of luminous flux emitted by a first LED in the first set at a determined current and the amount of luminous flux emitted by a second LED in the second set at the determined current to obtain a desired color spectrum; and
wherein the LEDs in the first and second sets of LEDs are in series.
2. An LED light source as set forth in claim 1 , wherein the number of LEDs in the first set and the number of LEDs in the second set are selected to produce a desired forward voltage.
3. An LED light source as set forth in claim 2 , wherein the desired forward voltage is an AC line voltage.
4. An LED light source as set forth in claim 1 , wherein the first color and the second color are selected from the group comprising red, green, and blue.
5. An LED light source as set forth in claim 1 ,
wherein the LEDs in the first set have a wavelength between approximately 430 nm and 480 nm,
wherein the LEDs in the second set have a wavelength between approximately 600 and 630 nm, and
wherein the LED light source includes a group of luminophores which are configured to emit light of a wavelength between approximately 555 nm and 585 nm.
6. An LED light source as set forth in claim 1 , wherein the desired color spectrum is white.
7. An LED light source as set forth in claim 1 , wherein the LEDs in the first and second sets of LEDs are arranged in a matrix.
8. An LED light source as set forth in claim 7 , wherein the LEDs in the first and second sets of LEDs are randomly arranged in the matrix.
9. An LED light source comprising:
a plurality of sets of LEDs, each set comprising one or more LEDs of a single color;
wherein the color of the LEDs in each set is different from the colors of the LEDs in other sets,
wherein each set has a corresponding value of luminous flux, the value of luminous flux based on the amount of luminous flux emitted by an LED in that set at a determined current,
wherein the numbers of LEDs corresponding to the plurality of sets are determined based on a ratio, the ratio based on the values of luminous flux corresponding to the plurality of sets of LEDs to obtain a desired output light color, and
wherein the LEDs in the plurality of sets are all in series.
10. An LED light source as set forth in claim 9 , wherein the number of LEDs in each set of the plurality of sets is further determined to produce a desired forward voltage.
11. An LED light source as set forth in claim 10 , wherein the desired forward voltage is an AC line voltage.
12. An LED light source as set forth in claim 9 , wherein a single current is configured to run through the LEDs in the plurality of sets, and wherein the LEDs in the plurality of sets are configured to operate in a single string.
13. An LED light source as set forth in claim 9 , wherein each LED in the plurality of sets has a color, and wherein the color is selected from the group comprising red, green, and blue.
14. An LED light source as set forth in claim 9 ,
wherein the plurality of sets of LEDs comprise a first LED and a second LED,
wherein the first LED has a wavelength between approximately 430 nm and 480 nm,
wherein the second LED has a wavelength between approximately 600 nm and 630 nm, and
wherein the LED light source includes a group of luminophores which are configured to emit light of a wavelength between approximately 555 nm and 585 nm.
15. An LED light source as set forth in claim 9 , wherein the desired output light color is white.
16. An LED light source as set forth in claim 9 , wherein the LEDs in the plurality of sets of LEDs are arranged in a matrix.
17. An LED light source as set forth in claim 16 , wherein the LEDs in the plurality of sets of LEDs are randomly arranged in the matrix.
18. A method of producing a spectrum of white light or arbitrary light color from a plurality of LEDs, comprising:
selecting a first set of LEDs, the first set comprising one or more LEDs of a first color;
selecting a second set of LEDs, the second set comprising one or more LEDs of a second color, wherein the second color is different from the first color;
determining the number of LEDs in the first set and the number of LEDs in the second set based on a ratio, the ratio selected based on the amount of luminous flux emitted by a first LED in the first set at a determined current and the amount of luminous flux emitted by a second LED in the second set at the determined current to obtain a desired color spectrum; and
running the LEDs in the first and second sets in series.
19. A method as set forth in claim 18 , wherein the numbers of LEDs in the first set and the second set are selected to produce a desired forward voltage.
20. A method as set forth in claim 19 , wherein the desired forward voltage is an AC line voltage.
21. A method as set forth in claim 18 , wherein the first color and the second color are selected from the group comprising red, green, and blue.
22. A method as set forth in claim 18 , the method further comprising:
selecting a group of luminophores which are configured to emit light of a wavelength of between approximately 555 nm and 585 nm,
wherein the LEDs in the first set have a wavelength between approximately 430 nm and 480 nm, and
wherein the LEDs in the second set have a wavelength between approximately 600 nm and 630 nm.
23. A method as set forth in claim 18 , wherein the desired color spectrum is white.
24. A method as set forth in claim 18 , the method further comprising arranging the LEDs in the first and second sets in a matrix.
25. A method as set forth in claim 24 , the method further comprising randomly arranging the LEDs in the first and second sets in the matrix.
26. A method of developing a circuit with white or arbitrary light color output, comprising:
providing a plurality of sets of LEDs, each set comprising one or more LEDs of a single color;
wherein the color of the LEDs in each set is different from the colors of the LEDs in other sets, and
wherein each set has a corresponding value of luminous flux, the value of luminous flux based on the amount of luminous flux emitted by an LED in that set at a determined current;
determining the numbers of LEDs corresponding to the plurality of sets based on a ratio, the ratio selected based on the values of luminous flux corresponding to the plurality of sets of LEDs to obtain a desired output light color; and
running the LEDs in the plurality of sets in series.
27. A method as set forth in claim 26 , the method further comprising:
determining the number of LEDs in each set of the plurality of sets to produce a desirable forward voltage.
28. A method as set forth in claim 26 , the method further comprising:
running a single current through the LEDs in the plurality of sets of LEDs, and
operating the LEDs in the plurality of sets as a single string.
29. A method as set forth in claim 26 , wherein each LED in the plurality of sets has a color, and wherein the color is selected from the group comprising red, green, and blue.