Lighting apparatus with a light source comprising light emitting diodes
View Patent ↗Embodiments of a lighting apparatus with a light source using one or more light emitting diodes (LEDs) to generate light. In one embodiment, the lighting apparatus comprises a light diffusing assembly that generates an optical intensity profile consistent with incandescent lamps. The light diffusing assembly comprises an envelope and a reflector element having frusto-conical member and an aperture element disposed therein. The lighting apparatus can also comprise a heat dissipating assembly with a plurality of heat dissipating elements disposed radially about the envelope. In one example, the heat dissipating elements are spaced apart from the envelope to promote convective heat dissipation.
1. A lighting apparatus, comprising:
an envelope forming an interior volume and comprising light-transmissive material;
a heat dissipating assembly comprising a plurality of heat dissipating elements arranged radially about a center axis;
a reflector element disposed in the interior volume, wherein the reflector element comprises an aperture element disposed at the center axis; and
a light source in thermal contact with the heat dissipating assembly.
2. The lighting apparatus of claim 1 , wherein the light source comprises one or more light emitting diodes.
3. The lighting apparatus of claim 1 , wherein the light source comprises one or more organic light emitting diodes.
4. The lighting apparatus of claim 1 , wherein heat dissipating elements have a tip end proximate the envelope, and wherein the air gap at the tip end is about 2 mm or greater.
5. The lighting apparatus of claim 1 , wherein the heat dissipating elements fit within an A-type lamp profile or a G-type lamp profile.
6. The lighting apparatus of claim 1 , wherein the plurality of heat dissipating elements are spaced-apart from the envelope forming an air gap.
7. The lighting apparatus of claim 1 , wherein the plurality of heat dissipating elements are substantially equally spaced from one another.
8. A lighting apparatus, comprising:
an envelope forming an interior volume and comprising light-transmissive material;
a heat dissipating assembly comprising a plurality of heat dissipating elements arranged radially about a center axis;
a reflector element disposed in the interior volume, wherein the reflector element comprises an aperture element disposed at the center axis; and
a light source in thermal contact with the heat dissipating assembly;
wherein the plurality of heat dissipating elements have a base end below the envelope and a body element that extends from the base end, the body element terminating at a tip end proximate the envelope.
9. A lighting apparatus, comprising:
an envelope forming an interior volume and comprising light-transmissive material;
a reflector element disposed in the interior volume, wherein the reflector element comprises an aperture element disposed at a center axis of the lighting apparatus; and
a light source comprising one or more light emitting diodes.
10. The lighting apparatus of claim 9 , wherein the reflector element comprises a frusto-conical member.
11. The lighting apparatus of claim 10 , wherein the frusto-conical member tapers from its center axis toward the envelope.
12. The lighting apparatus of claim 9 , wherein the reflector element comprises one or more slots disposed radially about the center axis and positioned between the reflector element and the envelope.
13. The lighting apparatus of claim 9 , wherein the aperture element comprises a circular member aligned with the center axis.
14. The lighting apparatus of claim 9 , wherein said lighting apparatus exhibits an optical intensity distribution of about 100±20% over a latitude coordinate θ of about 135° or greater.
15. The lighting apparatus of claim 9 , wherein said lighting apparatus exhibits an optical intensity distribution of about 100±10% over a latitude coordinate of about 150° or greater.