LED lantern with fresnel lens
A lighting device having a plurality of LEDs mounted on a heat sink that serves to transfer heat from the LEDs to the outside environment. The lighting device is positioned within a fresnel lens to produce a distribution of light.
1. A lighting device comprising:
(a) a plurality of LEDs disposed in a radial array about a vertical axis;
(b) a central member having each LED mounted on a vertical surface thereof, the central member made of a thermally conductive material to conduct heat away from the LEDs, wherein the central member has a first and second circular disk mounted on opposed ends of the central member transverse to the vertical axis of the central member;
(c) a tubular member surrounding the central member, wherein the tubular member is mounted in a first groove in the first circular disk and a second opposed end of the tubular member is mounted in a second groove in the second circular disk and wherein the light from the LEDs passes through the tubular member; and
(d) a fresnel lens encircling the tubular member.
2. The lighting device of claim 1 , wherein the tubular member has a dentated surface that surrounds the LEDs and diffuses the light emitted from the LEDs.
3. The lighting device of claim 1 having four LEDs spaced 90 degrees apart in a common horizontal plane.
4. The lighting device of claim 1 having three radial arrays of LEDs, wherein each radial array has four LEDs spaced 90 degrees apart in a common horizontal plane.
5. The lighting device of claim 4 , wherein a central radial array of LEDs is vertically aligned with the focal point of the fresnel lens.
6. A lighting device comprising:
(a) a plurality of LEDs disposed in a radial array about a vertical axis;
(b) a central member having each LED mounted on a vertical surface thereof, the central member made of a thermally conductive material to conduct heat away from the LEDs, wherein the central member comprises three substantially identical right angle prisms with substantially identical square horizontal cross-sections with four vertical surfaces;
(c) a tubular member surrounding the central member, wherein the light from the LEDs passes through the tubular member; and
(d) a fresnel lens encircling the tubular member.
7. The lighting device of claim 6 , wherein each vertical surface of the three substantially identical right angle prisms have one LED mounted thereon.
8. The lighting device of claim 7 , wherein one LED is radially mounted every 30 degrees about the vertical axis.
9. The lighting device of claim 1 , wherein the central member has a centralized right angle prism with a square horizontal cross-section.
10. The lighting assembly of claim 1 wherein the first and second circular disks are made of a thermally conductive material.
11. The lighting assembly of claim 10 , wherein the first and second circular disks are in thermal communication with outside air.
12. The lighting device of claim 1 , wherein a surface of the tubular member is uniformly frosted.
13. The lighting device of claim 1 , further comprising a light socket base electrically connected to the LEDs.
14. The lighting device of claim 1 , wherein the fresnel lens includes a focal point in a horizontal plane that intersects the radial array of LEDs.
15. A lighting device comprising:
(a) a lighting assembly having
(i) a heat sink having at least one centralized right angle prism with a square horizontal cross-section with a plurality of vertical surfaces,
(ii) a plurality of equispaced LEDs, each LED mounted on a vertical surface of the heat sink, and
(iii) a tubular diffuser having a frosted surface, wherein the frosted surface surrounds the LEDs to diffuse the light emitted from the LEDs; and
(b) a fresnel lens surrounding the lighting assembly;
whereby light emanating from the LEDs passes through the diffuser and the fresnel lens to provide a substantially uniform horizontal plane of light.
16. The lighting device of claim 15 having four LEDs spaced 90° apart in a common horizontal plane.
17. The lighting device of claim 16 , wherein the horizontal plane of the LEDs intersects a focal point of the fresnel lens.
18. The lighting device of claim 15 , wherein the frosted surface of the diffuser faces the fresnel lens.
19. The lighting device of claim 15 , wherein the frosted surface of the diffuser faces the LEDs.
20. The lighting device of claim 15 , wherein the lighting assembly further comprises a controller for regulating the polarity, voltage, and current limits of the electricity going to the LEDs.
21. A lighting device comprising:
(a) a central member having a plurality of similar centralized right angle prisms with square horizontal cross-sections, the central member made of a thermally conductive material to conduct heat away from the LEDs;
(b) a plurality of equispaced LEDs, each LED mounted on a vertical surface of the central member, wherein the LEDs are disposed in a radial array about a vertical axis of the central member; and
(c) a fresnel lens encircling the radial array of LEDs, wherein the fresnel lens includes a focal point in a horizontal plane that intersects the radial array of LEDs.