LED Luminaire Tertiary Optic System
A lens system for LED based light fixtures having a substantially coplanar array of LED's with a requirement for a wide angle of illumination. And in particular, light fixtures comprising LED lights used in low bay applications.
1 - 21 . (canceled)
22 . A thermal management system for increasing cooling in a light fixture by free convection and without mechanical means comprising:
(i) a manifold located at a perimeter of the light fixture, the manifold comprising a perimeter skirt and a set of fins defining a set of chambers inside of the perimeter skirt;
(ii) a cluster of LEDs at least partially surrounded by the manifold; and
(iii) a cover for the cluster of LEDs, wherein the cover channels an updraft created by free convection of heat generated by the cluster of LEDs toward the manifold.
23 . The thermal management system in accordance with claim 22 wherein the cover channels the updraft created by the free convection of heat via laminar air flow.
24 . The thermal management system in accordance with claim 22 wherein the cover is substantially hemispherical.
25 . The thermal management system in accordance with claim 22 wherein the set of fins comprises multiple fins directed inwardly from the perimeter skirt.
26 . The thermal management system in accordance with claim 22 further comprising a constriction substantially at the manifold.
27 . The thermal management system in accordance with claim 22 wherein the updraft created by the free convection of heat causes laminar air flow into the set of fins.
28 . The thermal management system in accordance with claim 22 wherein the set of fins creates an increased heat flux through the Venturi effect.
29 . The thermal management system in accordance with claim 28 wherein the increased heat flux creates a high temperature gradient between the cluster of LEDs and the perimeter skirt.
30 . A light fixture for thermal management comprising:
(i) a cover being in association with the light fixture;
(ii) a heat transfer manifold being in association with the light fixture and comprising a perimeter skirt and a set of fins; and
(iii) a cluster of lights at least partially surrounded by the heat transfer manifold;
wherein the cover is arranged such that a convective updraft generated by heat from the cluster of lights is directed toward the heat transfer manifold.
31 . The light fixture in accordance with claim 30 , further comprising a thermal backplane and a constriction between the thermal backplane and the heat transfer manifold to accelerate air flow through the heat transfer manifold.
32 . The light fixture in accordance with claim 30 wherein the light fixture generally has a circular shape.
33 . The light fixture in accordance with claim 30 wherein the cover is substantially hemispherical in shape.
34 . The light fixture in accordance with claim 30 wherein the perimeter skirt is attached to the set of fins.
35 . The light fixture in accordance with claim 34 wherein the perimeter skirt and the set of fins are formed as one unit in cast metal.
36 . The light fixture in accordance with claim 30 wherein the convective updraft increases a heat flux causing a temperature gradient across the set of fins to maximize the heat flux at the perimeter skirt.