Led luminaire for generating substantially uniform illumination on a target plane
AssigneeLumination LLC
InventorsMark J. Mayer, Matthew S. Mrakovich
Life of this patent
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Abstract
A luminaire includes a fixture housing, a plurality of LEDs disposed on a mounting surface in the fixture housing, and at least one reflector disposed in the housing. A center of each LED is positioned along a line and each LED faces towards an associated target surface that is vertically spaced from the luminaire. The at least one reflector includes first and second reflective surfaces. Each reflective surface is configured with respect to the line on which the LEDs are positioned so that the first reflective surface and the second reflective surface each reflect light from each of the LEDs in a substantially same direction that is offset from a vertical axis.
Claims20
A luminaire comprising:
- a fixture housing;
- a plurality of LEDs disposed on a mounting surface in the fixture housing, a center of each LED positioned along a line and each LED facing towards an associated target surface vertically spaced from the luminaire;
- and
- at least one reflector disposed in the housing including first and second reflective surfaces, each reflective surface being configured with respect to the line on which the LEDs are positioned so that the first reflective surface and the second reflective surface each reflect light from each of the LEDs in a substantially same direction that is offset α° from a vertical axis.
The luminaire of claim 4, wherein the line forms a circle and the reflective surfaces each form a surface about an axis of revolution that is concentric with the center of the circle.
A luminaire comprising:
- a fixture housing;
- a plurality of LEDs disposed on a mounting surface in the fixture housing, a center of each LED positioned along a line and each LED being directed towards an associated target surface vertically spaced from the luminaire;
- and
- at least one reflector disposed in the housing and configured to reflect light emanating from each LED and to direct the reflected light toward the associated target surface, the at least one reflector including first and second reflective surfaces, in a cross section taken normal to the line on which the LEDs are disposed each reflective surface follows along a portion of a conic having a symmetrical axis disposed at an angle other than perpendicular to the mounting surface.
The luminaire of claim 12, wherein the at least one reflector includes a fifth reflective surface configured to reflect light emanating from the further plurality of LEDs disposed inside the circle formed by the second line.
A luminaire for generating substantially uniform illumination on a target surface comprising a plurality of LEDs mounted to a support and at least one optic connected to the support, the LEDs and the at least one optic being configured to generate a beam pattern where a first light intensity along an axis is about 20% to about 30% of a second light intensity that is generated at about 50° to about 70° angularly offset from the axis, wherein the at least one optic cooperates with greater than one LED of the plurality of LEDs to produce the beam pattern.
A method for illuminating a target plane comprising:
- providing a luminaire a distance measured in a vertical axis from a target plane;
- providing a plurality of LEDs on a mounting surface of the luminaire each facing towards the target plane;
- directing light of a first intensity from the plurality of LEDs toward the first area of the target plane that is normal to the vertical axis;
- and
- directing light, via a reflective optic or a refractive optic, of a second intensity from the plurality of LEDs toward a second area of the target plane that is offset from the vertical axis an angle α, wherein the second intensity equals about the inverse of the first intensity multiplied by the square of cosine α.
Dependencies are inferred from the claim text.