Lighting arrangement with a spatially controllable reflector element
A lighting arrangement and a method of forming an illumination beam are described. A plurality of LED lighting elements is operable to emit light. A plurality of collimator elements is arranged to collimate light emitted from the LED lighting elements. A first projection element is arranged to project light emitted from the collimator elements onto a spatially controllable reflector element. The spatially controllable element comprises a plurality of reflector elements adjustable between a first and a second position. In the first position, the light is reflected into the direction of a second projection element to form a projected illumination beam. In the second position, light is reflected into a different direction to not contribute to the projected illumination beam.
1. A lighting arrangement, comprising:
a plurality of LED lighting elements,
a plurality of collimator elements arranged to collimate light emitted from the lighting elements wherein the light output surfaces of the collimator elements have a first extension in a first direction and a second extension in a second direction perpendicular to the first direction, the second extension being larger than the first extension;
a spatially controllable reflector element comprising a plurality of reflector elements adjustable at least between a first and second position, wherein the spatially controllable reflector element has a switching direction of the reflector elements,
a first projection element arranged to project light emitted from the collimator elements onto the spatially controllable reflector element,
a second projection element,
wherein in the first position of the reflector elements the light from the first projection element is reflected into the direction of a second projection element to form a projected illumination beam,
wherein in the second position of the reflector elements the light is reflected into a different direction to not contribute to the projected illumination beam, and
wherein the second extension is arranged in parallel to the switching direction.
2. The lighting arrangement according to claim 1 , wherein the LED lighting elements are arranged on a carrier spaced from each other.
3. The lighting arrangement according to claim 1 , wherein the collimator elements each comprise a light input surface arranged next to the LED lighting elements and an opposite light output surface.
4. The lighting arrangement according to claim 3 , wherein the light output surfaces are larger than the light input surfaces.
5. The lighting arrangement according to claim 3 , wherein the quotient of the first and second extension of the light output surfaces differs from the quotient of a first and a second extension of the light input surfaces.
6. The lighting arrangement according to claim 3 , wherein light emitted from the collimator elements onto the spatially controllable reflector element is adapted to the size, aspect ratio and angular orientation of the spatially controllable reflector element.
7. The lighting arrangement according to claim 3 , wherein the light output surfaces of the collimator elements are arranged directly adjacent to each other forming a common light output surface.
8. The lighting arrangement according to claim 3 , wherein the collimator elements are at least substantially frustum shaped with edges extending from corners of a rectangular light input surface to corners of the light output surface.
9. The lighting arrangement according to claim 3 , wherein the light output surfaces have a convex shape.
10. The lighting arrangement according to claim 1 , wherein the first projection element comprises at least one concave reflector surface.
11. The lighting arrangement according to claim 1 , wherein the second projection element comprises at least one projection lens.
12. The lighting arrangement according to claim 1 , wherein the LED lighting elements are electrically connected to be operable independently.
13. The lighting device according to claim 1 , wherein the LED lighting elements are arranged in an array comprising at least two parallel rows of spaced LED lighting elements, the two rows being arranged at a distance from each other.