LED PROFILE LUMINAIRE
A lighting fixture comprising a light source including an array of LEDs, a plurality of collimating optics, and a light-mixing assembly comprising a reflective tube having a converging section and a diverging section. The array comprises LEDs have a plurality of colors, such as at least one white LED and at least one amber LED positioned on a perimeter of the array. The reflective tube preferably includes a necked portion between the converging section and the diverging section. For example, a sidewall of the reflective tube can be longitudinally curved (e.g., in the shape of an asphere or a parabola). In one embodiment, a shape of the sidewall of the reflective tube can be adjustable to modify the light wash exiting the light-mixing assembly.
1 . A lighting fixture comprising:
a light source including an array of LEDs;
a plurality of collimating optics, each positioned to collimate light from at least one of the LEDs; and
a light-mixing assembly positioned to receive light from the collimating optics, the light-mixing assembly comprising a reflective tube having a converging section and a diverging section.
2 . A lighting fixture as claimed in claim 1 , wherein the array comprises LEDs having a plurality of colors.
3 . A lighting fixture as claimed in claim 2 , wherein at least one of the LEDs comprises an amber LED and at least one of the LEDs comprises the a white LED, and wherein the amber LED and the white LED are positioned on a perimeter of the array.
4 . A lighting fixture as claimed in claim 1 , wherein the collimating optics are molded plastic optics that work via total internal reflection.
5 . A lighting fixture as claimed in claim 1 , wherein the collimating optics are a photonic lattice structure applied to the LEDs
6 . A lighting fixture as claimed in claim 1 , wherein the reflective tube comprises a polygonal cross section.
7 . A lighting fixture as claimed in claim 1 , wherein the reflective tube has a reflective surface including specular aluminum (such as Alanod MIRO).
8 . A lighting fixture as claimed in claim 1 , wherein the reflective tube has a reflective surface including a prismatic V-groove structure (such as 3M Optical Lighting Film).
9 . A lighting fixture as claimed in claim 1 , wherein the reflective tube includes a necked portion between the converging section and the diverging section.
10 . A lighting fixture as claimed in claim 1 , wherein a sidewall of the reflective tube is longitudinally curved.
11 . A lighting fixture as claimed in claim 10 , wherein a shape of the sidewall of the reflective tube comprises an asphere.
12 . A lighting fixture as claimed in claim 10 , wherein a shape of the sidewall of the reflective tube comprises a parabola.
13 . A lighting fixture as claimed in claim 1 , wherein a shape of a sidewall of the reflective tube is adjustable to modify the light wash exiting the light-mixing assembly.
14 . A lighting fixture as claimed in claim 1 , further comprising a gate assembly and a projection lens on an output side of the gate assembly.
15 . A lighting fixture as claimed in claim 14 , further comprising a field lens between the light-mixing assembly and the lens assembly, the field lens modifying an output etendue of the light-mixing assembly to better match an input entendue of the projection lens.