LED lighting device having opposed irregular lenslet arrays with planar facets
A lighting device includes at least on LED light source, ca collimator, a first lenslet array of lenslets tessellated in an irregular pattern, and a second array of lenslets tessellated in the same irregular pattern as the first array of lenslets, such that each of the lenslets in the first array is aligned with a corresponding one of the lenslets in the second array. The first array further includes a plurality of transmissive planar facets covering an intersection between lenslet.
1. An integrating lenslet arrangement including:
a first array having a plurality of first lenslets arranged in an irregular pattern, a shared wall shaped intersection between some of adjacent first lenslets, pockets defined between some of adjacent first lenslets, and a plurality of transmissive first planar facets covering some of the pockets; and
a second array having a plurality of second lenslets arranged in the same irregular pattern as the first array and forming a second array positioned downstream from the first array, each second lenslet being aligned with a corresponding one of said first lenslets.
2. The integrating lenslet arrangement of claim 1 , wherein the planar facets lie in a single virtual plane.
3. The integrating lenslet arrangement of claim 1 , wherein the first array and the second array are provided on opposing surfaces of a single body.
4. The integrating lenslet arrangement of claim 1 , wherein the first array and the second array are provided on spatially separated bodies.
5. The integrating lenslet arrangement of claim 1 , wherein the planar facets covers less than 20% of a total surface of the first array.
6. The integrating lenslet arrangement of claim 1 , wherein the shared wall shaped intersection extend in a direction transverse to the planar facets of the first array.
7. The integrating lenslet arrangement of claim 1 , the second lenslet array further comprising a plurality of transmissive second planar facets in between the lenslets.
8. The integrating lenslet arrangement of claim 1 , wherein the second array has no transmissive planar facets.
9. The integrating lenslet arrangement of claim 1 , wherein only 30% to 90% of pockets between the lenslets is covered by the planar facets.
10. The integrating lenslet arrangement of claim 1 , wherein the lenslets of both the first and second arrays have locally varying sizes.
11. The optical arrangement of claim 10 , wherein the first lenslet array is integral to the collimator.
12. An optical arrangement comprising a collimator and the integrating lenslet arrangement of claim 1 .
13. A lighting device comprising the optical arrangement of claim 12 , and at least one LED light source positioned relative to the collimator such that the collimator collimates the light of the at least one LED light source and projects said collimated light onto the lenslet arrangement.
14. The lighting device of claim 13 , wherein the lighting device is a light bulb.
15. A luminaire comprising:
a housing; and
the lighting device of claim 14 .