A lamp includes an optically transmissive enclosure and a base connected to the enclosure. A LED board is positioned in the enclosure and has a first side and a second side. A first LED array is mounted on the first side and a second LED array is mounted on the second side where the LED arrays are operable to emit light when energized through an electrical path from the base. A first diffusive lens and a second diffusive lens are located inside of and spaced from the enclosure. The first diffusive lens receives light emitted from the first LED array and the second diffusive lens receives light emitted from the second LED array.
1. A lamp comprising:
an optically transmissive diffusive enclosure having a first end and a distal end spaced from the first end, the enclosure defining an interior space and a pair of first openings and a pair of second openings, the pair of first openings and the pair of second openings communicating the interior space with the exterior of the enclosure, the enclosure having an interior surface defining an interior shape;
a base connected to the first end of the enclosure;
a LED board positioned in the interior space and defining a first side and a second side where the first side is spaced from the enclosure by a first space and the second side is spaced from the enclosure by a second space and where the pair of first openings communicate with at least the first space and the pair of second openings communicate with at least the second space, the LED board having a first peripheral edge and a second peripheral edge extending from approximate the base toward the distal end of the enclosure, the LED board being dimensioned and shaped such that the first peripheral edge and the second peripheral edge of the LED board have the same shape as the interior shape of the interior surface such that the first peripheral edge and the second peripheral edge are disposed closely adjacent to the interior surface over the length of the first peripheral edge and the second peripheral edge;
at least one first LED mounted on the first side and at least one second LED mounted on the second side operable to emit light when energized through an electrical path from the base;
a first diffusive lens and a second diffusive lens located inside of and spaced from the enclosure, the first diffusive lens being spaced from the at least one first LED to define a first open space bounded by the first diffusive lens, the first diffusive lens receiving light emitted from the at least one first LED, and the second diffusive lens being spaced from the at least one second LED to define a second open space bounded by the second diffusive lens, the second diffusive lens receiving light emitted from the at least one second LED, the first diffusive lens and the second diffusive lens being mounted on the LED board such that a major portion of the LED board is exposed;
a thermally conductive area formed on the LED board for dissipating heat from the at least one first LED and the at least one second LED where at least a portion of the thermally conductive area is in the electrical path.
2. The lamp of claim 1 wherein the LED board comprises a PCB FR4 board.
3. The lamp of claim 1 wherein the LED board comprises a metal core printed circuit board.
4. The lamp of claim 1 wherein the thermally conductive area dissipates heat from the at least one first LED and the at least one second LED without a heat sink.
5. The lamp of claim 1 wherein the LED board comprises an electrical circuit mounted on a substrate.
6. The lamp of claim 5 wherein the substrate is not in the electrical path.
7. The lamp of claim 5 wherein the electrical circuit comprises at least one of a flex circuit and a lead frame and the substrate comprises at least one of glass and metal.
8. The lamp of claim 1 wherein a first one of the first pair of openings and a first one of the second pair of openings are provided proximate to the base and a second one of the first pair of openings and a second one of the second pair of openings are provided proximate to a distal end of the lamp such that air flows through the enclosure along a longitudinal axis of the lamp.
9. The lamp of claim 8 wherein the first diffusive lens and the second diffusive lens comprise vent openings that allow air to flow into the space bounded by the first diffusive lens and the second diffusive lens.
10. The lamp of claim 1 wherein the LED board comprises a planar rigid member.
11. The lamp of claim 10 wherein the first diffusive lens and the second diffusive lens are mounted to the LED board.
12. The lamp of claim 1 wherein the first diffusive lens and the second diffusive lens provide a diffuse scattering layer that produces a more uniform far field pattern.
13. The lamp of claim 1 wherein the first diffusive lens and the second diffusive lens form part of a single lens assembly having a U-shaped support that is disposed over the peripheral edge of the LED board, the U-shaped support comprising a first support member connected to the first diffusive lens and a second support member connected to the second diffusive lens where the first support member contacts the first side and the second support member contacts the second side.
14. The lamp of claim 13 wherein the first support member and the second support member are connected at a living hinge.
15. The lamp of claim 1 wherein the first diffusive lens and the second diffusive lens are connected to the LED board by a snap-fit connection.
16. The lamp of claim 1 wherein the first diffusive lens and the second diffusive lens are formed integrally with and are supported by the enclosure.
17. A lamp comprising:
an optically transmissive diffusive enclosure defining an interior space, the enclosure comprising apertures that allow air to flow into, through and out of the enclosure;
a base connected to the enclosure to define a longitudinal axis extending from the base to the enclosure;
a LED board positioned in the interior space and extending parallel to the longitudinal axis;
a plurality of LEDs mounted on the LED board operable to emit light when energized through an electrical path from the base;
a thermally conductive area formed on the LED board for dissipating heat from the plurality of LEDs where at least a portion of the thermally conductive area is in the electrical path a diffusive lens located inside of and spaced from the enclosure, the diffusive lens being spaced from the plurality of LEDs to define an open space bounded by the diffusive lens and the LED board, the diffusive lens receiving light emitted from the plurality of LEDs, the diffusive lens being mounted on the LED board such that a major portion of the LED board is exposed and wherein the diffusive lens comprises vent openings that allow the air to flow into the space bounded by the diffusive lens and the LED board, the diffusive lens being configured such that a first portion of the thermally conductive area is disposed inside of the diffusive lens and a second portion of the thermally conductive area is disposed outside of the diffusive lens.