Signal light using phosphor coated LEDs
A method for creating an improved signal light is disclosed. For example, the improved signal light includes a housing, one or more first type of light emitting diodes (LEDs) emitting a light energy having a first dominant wavelength deployed in the housing, one or more second type of LEDs emitting a light energy having a second dominant wavelength deployed in the housing, a filter and a mixer. The filter may filter the light energy of the one or more second type of LEDs such that only a third dominant wavelength passes from the one or more second type of LEDs. The mixer may mix the light energy having the first dominant wavelength and the filtered light energy having the third dominant wavelength to form a light energy having a desired fourth dominant wavelength.
1. A signal light comprising:
a housing;
a filter;
at least one outer lens; and
at least one or more light emitting diodes (LEDs) deployed in said housing, wherein said at least one or more (LEDs) are made of Indium Gallium Nitride (InGaN) and have a perceived color via a blue LED that is coated with a phosphor, wherein a light of the at least one or more LEDs is filtered by the filter such that a blue light is absorbed and a yellow light passes.
2. The signal light of claim 1 , wherein the at least one or more LEDs are placed in a reflector.
3. The signal light of claim 1 , wherein said at least one outer lens is attached to said housing.
4. The signal light of claim 2 , wherein said at least one outer lens comprises a scattered surface.
5. The signal light of claim 1 , wherein said filter is located between said at least one or more LEDs and said at least one outer lens.
6. The signal light of claim 1 , wherein said filter may be located directly on each one of said at least one or more LEDs.
7. The signal light of claim 1 , wherein said filter is a colored filter or a dichroic filter.
8. The signal light of claim 1 , wherein said filter is deployed in a Fresnel lens.
9. The signal light of claim 1 , wherein said at least one outer lens diffracts light into an angular direction.
10. The signal light of claim 1 , wherein a desired light energy of said at least one or more LEDs comprises x and y coordinates in accordance with a 1931 CIE Chromaticity Diagram within boundaries of:
x
y
0.53
0.47
0.51
0.47
0.59
0.39
0.61
0.39
0.53
0.47.
11. The signal light of claim 1 , wherein said filter is deployed in said at least one outer lens.
12. The signal light of claim 1 , wherein a cutoff point of said filter is at approximately 550 nm+/−40 nm.
13. The signal light of claim 1 , further comprising:
a mixing lens, wherein said mixing lens is positioned between said at least one or more LEDs and said at least one outer lens.
14. The signal light of claim 13 , wherein said mixing lens comprises a Fresnel lens.
15. The signal light of claim 14 , wherein said at least one or more LEDs, said mixing lens and said at least one outer lens are aligned on top of one another.
16. The signal light of claim 1 , wherein said at least one or more LEDs comprises an array of LEDs.
17. A method of creating a signal comprising:
providing a housing;
providing a filter;
providing at least one outer lens; and
providing at least one or more light emitting diodes (LEDs) deployed in said housing, wherein said at least one or more (LEDs) are made of Indium Gallium Nitride (InGaN) and have a perceived color via a blue LED that is coated with a phosphor, wherein a light of the at least one or more LEDs is filtered by the filter such that a blue light is absorbed and a yellow light passes.