High bay luminaire
An optic for a light emitting diode array comprises an arrangement of optical structures for providing one or more down lighting distribution from the LED array; and a waveguide edge for providing one or more up-lighting distributions from the LED array. Luminaires are described comprising a light emitting diode (LED) array and the optic. Lighting systems are described comprising a plurality of the luminaires arranged over an area enclosed by walls.
1. An optic for a light emitting diode array comprising:
an arrangement of optical structures comprising one or more refractive facets for providing one or more down lighting distribution from the LED array; and
a waveguide edge for providing one or more up-lighting distributions from the LED array.
2. The optic of claim 1 , wherein the optical structures are micro-scale optical structures.
3. The optic of claim 1 , wherein the optical structures are Fresnel structures.
4. The optic of claim 1 , wherein single optical structures are positioned over each LED in the LED array.
5. The optic of claim 1 , wherein the optical structures have a radial arrangement.
6. The optic of claim 1 , wherein the optical structures are arranged in concentric rings.
7. The optic of claim 1 , wherein the optical structures are uniform over the arrangement.
8. The optic of claim 1 , wherein the optical structures vary over the arrangement.
9. The optic of claim 1 , wherein the optic is a single piece.
10. The optic of claim 1 , wherein the arrangement of optical structures provides a symmetric down lighting distribution.
11. The optic of claim 1 , wherein the arrangement of optical structures provides an asymmetric down lighting distribution.
12. The optic of claim 1 , where in the one or more up-lighting distributions is symmetric.
13. The optic of claim 1 , where in the one or more up-lighting distributions is asymmetric.
14. The optic of claim 1 , wherein the waveguide edge receives 5% to 20% of a total light produced by the LED array.
15. A luminaire comprising:
a light emitting diode (LED) array; and
an optic covering the LED array, the optic comprising an arrangement of optical structures comprising one or more refractive facets for providing one or more down lighting distributions from the LED array, and a waveguide edge for providing one or more up-lighting distributions from the LED array.
16. The optic of claim 15 , wherein the optical structures are micro-scale optical structures.
17. The optic of claim 15 , wherein the optical structures are Fresnel structures or single optical structures positioned over each LED in the LED array.
18. The optic of claim 15 , wherein the optical structures have a radial arrangement.
19. The luminaire of claim 15 , wherein the optical structures are arranged in concentric rings.
20. The luminaire of claim 15 , wherein the optical structures vary over the arrangement.
21. The luminaire of claim 15 , wherein the optic is a single piece.
22. The luminaire of claim 15 , wherein the arrangement of optical structures provides an asymmetric down lighting distribution.
23. The luminaire of claim 15 , wherein the one or more up-lighting distributions are of different color than the one or more down lighting distributions.
24. The luminaire of claim 15 , wherein the up-lighting and down lighting distributions are selected independently from one another.
25. The luminaire of claim 15 , wherein a ratio of max luminance at 65 degrees from nadir to total lumen output from the luminaire is less than 7.
26. The luminaire of claim 15 , wherein luminance at 65 degrees from nadir is less than 3×10 5 cd/m 2 .
27. The luminaire of claim 15 further comprising a glare shield.
28. The luminaire of claim 15 further comprising a LED heatsink including a plurality of vents proximate a driver assembly of the luminaire.
29. A luminaire comprising:
a light emitting diode (LED) array; and
an optic covering the LED array, the optic comprising an arrangement of optical structures providing a ratio of max luminance at 65 degrees from nadir to total lumen output from the luminaire of less than 7.
30. The optic of claim 29 , wherein the optical structures are micro-scale optical structures.
31. The optic of claim 29 , wherein the optical structures have a radial arrangement.
32. The luminaire of claim 29 , wherein the optical structures are arranged in concentric rings.
33. The luminaire of claim 29 , wherein the optical structures vary over the arrangement.
34. The luminaire of claim 29 , wherein the optic further comprises one or more structures providing one or more up-lighting distributions.
35. The luminaire of claim 29 , wherein the one or more structures is a waveguide edge.
36. The luminaire of claim 29 further comprising a glare shield.
37. A lighting system comprising:
a plurality of luminaires arranged over an area enclosed by walls, the luminaires comprising a light emitting diode (LED) array and an optic covering the LED array, the optic comprising an arrangement of optical structures comprising one or more refractive facets for providing one or more down lighting distributions form the LED array, and a waveguide edge for providing one or more up-lighting distributions from the LED array, wherein the optic of luminaires adjacent to the walls differs from the optic of luminaires over a central region of the area.
38. The lighting system of claim 37 , wherein the optic of luminaires adjacent to the walls provides an asymmetric down lighting distribution, and the optic of luminaires over the central region provides a symmetric down lighting distribution.