Asymmetric linear LED luminaire design for uniform illuminance and color

Abstract

An LED lamp for illuminating a surface under a flat angle in linear lighting applications such as cove lighting and wall washing is provided. It produces a uniform intensity distribution and a uniform color output throughout the beam pattern of the light beam produced by a multi-color LED light source. The lamp comprises a body of an extruded profile. The body comprises at least one section with a mirrored surface and at least a lens section which allows exiting of light from the body. At least one LED preferably having a LED lens is provided at the inner side of the body. This combination of optical systems results in an asymmetric beam pattern from the source.

The invention claimed is: 
     
       1. A An LED lamp for illuminating a surface comprising: 
 a body further comprising:;  
 a plurality of multi-color LED light sources; 
 a spherical cap lens covering each of the plurality of multi-color LED light sources and having a radius that is larger than a radius of a base of the spherical cap lens; 
 wherein the spherical cap lens further comprising comprises a plurality of spherical cap lenses covering respective ones of the plurality of multi-color LED light sources, and wherein each of the plurality of multi-color LED light sources and each of the plurality of spherical cap lenses covering respective ones of the plurality of multi-color LED light sources are arranged distant to each other on a an LED mounting plane and are aligned with their centers to a common center line with at least one paraboloidal section having its focus at the common center line of the plurality of multi-color LED light sources; 
 at least one section with a mirrored surface, for reflecting the light emitted by the at least one plurality of multi-color LED light source sources, the mirrored surface section further comprising the at least one paraboloidal section and at least one convex arc shaped reflector reflective surface; and 
 at least one lens section forming an exit surface for the light, the at least one lens section comprising a prime lens for a main beam direction and an outside lens for an auxiliary beam direction; and 
 wherein the at least one arc shaped reflector deflects parts of the light emitted by the plurality of multi-color LED light sources to the outside lens and other parts of the light to the prime lens. 
 
     
     
       2. The LED lamp of  claim 1 , wherein the body comprises a hollow profile. 
     
     
       3. The LED lamp of  claim 1 , wherein the body comprises an extruded profile. 
     
     
       4. The LED lamp of  claim 1 , wherein the body further comprises a backside reflector arranged behind a mounting plane of the plurality of multi-color LED light sources. 
     
     
       5. The LED lamp of  claim 1 , wherein the plurality of multi-color LED light sources, each comprising a plurality of LED chips. 
     
     
       6. The LED lamp of  claim 1 , wherein the mirrored surface is a total reflecting surface or a reflecting coated surface. 
     
     
       7. The LED lamp of  claim 1 , wherein the at least one paraboliodal section comprises a plurality of paraboloidal sections are provided being slightly rotated against each other. 
     
     
       8. The LED lamp of  claim 1 , wherein the at least one lens section comprises a Fresnel lens like structure. 
     
     
       9. The LED lamp of  claim 1 , wherein the at least one lens section comprises a prime lens for a main beam direction and an outside lens for an auxiliary beam direction is provided. 
     
     
       10. The LED lamp of  claim 9 , wherein the at least one arc shaped reflector deflects parts of the light emitted by the at least one multi-color LED light source to the outside lens and other parts of the light to the prime lens. 
     
     
       11. An LED lamp for illuminating a surface comprising:
 a body;   an LED light source;   a semi-sphere lens covering the LED light source, wherein the LED light source is located at a center of the semi-sphere lens;   at least one lens section forming an exit surface for light emitted by the LED light source, wherein the at least one lens section comprises a prime lens defining a first exit surface for a main beam direction and an outside lens defining a second exit surface for an auxiliary beam direction; and   at least one side wall comprising a mirrored surface located such that the mirrored surface receives a portion of the light emitted by the LED light source, the mirrored surface further comprising at least one paraboloidal section and at least one arc shaped reflector, wherein the at least one arc shaped reflector deflects parts of the portion of the light emitted by the LED light source to the outside lens and other parts of the portion of the light emitted by the LED light source to the prime lens.    
     
     
       12. The LED lamp of claim 11, wherein the body comprises a hollow profile.  
     
     
       13. The LED lamp of claim 11, wherein the body comprises an extruded profile.  
     
     
       14. The LED lamp of claim 11, wherein the mirrored surface is a total reflecting surface or a reflecting coated surface.  
     
     
       15. The LED lamp of claim 11, wherein the at least one paraboloidal section comprises a plurality of paraboloidal sections rotated against each other.  
     
     
       16. An LED lamp for illuminating a surface comprising:
 a body;   a plurality of LEDs on a first plane and aligned on a common center line and configured to emit light;   a spherical cap lens covering each of the plurality of LEDs and having a radius that is larger than a radius of a base of the spherical cap lens;   a first side wall paraboloidal section configured to deflect first light rays emitted from the plurality of LEDs through a first section of a first lens;   a second side wall paraboloidal section configured to deflect second light rays emitted from the plurality of LEDs through a second section of the first lens;   a first side wall arc shaped reflector configured to deflect third light rays emitted from the plurality of LEDs towards a backside reflector;   a second side wall arc shaped reflector configured to deflect fourth light rays emitted from the plurality of LEDs through a first section of a second lens; and   a third side wall arc shaped reflector configured to deflect fifth light rays emitted from the plurality of LEDs through a second section of the second lens;   wherein the first, second, and third side wall arc shaped reflectors are adjacent to the first and second side wall paraboloidal sections.    
     
     
       17. The LED lamp of claim 16, wherein the body comprises a hollow profile.  
     
     
       18. The LED lamp of claim 16, wherein the body comprises an extruded profile.  
     
     
       19. LED lamp of claim 16, wherein the plurality of LED light sources each comprises a plurality of LED chips.  
     
     
       20. The LED lamp of claim 16, wherein the first side wall paraboloidal section and the second side wall paraboloidal section are rotated against each other.