Asymmetric linear LED luminaire design for uniform illuminance and color
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.
1. A 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 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 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 multi-color LED light source, the mirrored surface section further comprising the at least one paraboloidal section and at least one arc shaped reflector; and
at least one lens section forming an exit surface for the light.
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 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.