Lighting device

1. A lighting device comprising:

a heat sink including a body, a plane surface on the body and a member disposed on the plane surface, wherein the member includes at least a side surface and a top surface, wherein the member has a height that extends along an axis from the plane surface to the top surface, and the height including a ⅓ point and a ⅔ point along the axis from the plane surface to the top surface;

a light source including a substrate disposed on the side surface of the member and a plurality of light emitting devices disposed on the substrate, the plurality of light emitting devices having a center point of all of the light emitting devices on the substrate; and

a cover to couple to the heat sink,

wherein a lowest point of the substrate is disposed above the ⅓ point of the height of the member from the plane surface, and

wherein the center point of the light emitting devices is above the ⅔ point of the height of the member from the plane surface.

2. The lighting device of claim 1 , wherein the member is a polygonal pillar having a plurality of the side surfaces.

3. The lighting device of claim 2 , wherein a number of the side surfaces of the polygonal pillar is equal to or greater than six.

4. The lighting device of claim 2 , wherein the light source is separately provided on each of the plurality of side surfaces of the polygonal pillar.

5. The lighting device of claim 1 , wherein the substrate includes a center point, and the center point of the substrate is disposed above the ⅔ point of the height of the member from the plane surface.

6. The lighting device of claim 1 , further comprising a plurality of heat radiating fins that extend from the body.

7. The lighting device of claim 6 , wherein a horizontal width of the heat radiating fins increases away from the plane surface and then decreases.

8. The lighting device of claim 1 , wherein the cover is formed of an opaque material.

9. The lighting device of claim 1 , wherein the member is integrally formed with the plane surface of the heat sink.

10. The lighting device of claim 1 , further comprising an aspheric lens disposed on at least one of the light emitting devices.

11. The lighting device of claim 1 , further comprising circuitry received in the heat sink.

12. The lighting device of claim 11 , wherein the member has a plurality of through holes, and wherein the circuitry is electrically connected to the substrate via the through holes of the member.

13. A lighting device comprising:

a heat sink including a body, a plane surface on the body and a member disposed on the plane surface, wherein the member includes a lower surface adjacent to the plane surface, a side surface and an upper surface, wherein the upper surface of the member having a center point, and the lower surface of the member having a center point;

a light source including a substrate disposed on the side surface of the member and a plurality of light emitting devices disposed on the substrate; and

a cover to couple to the heat sink,

wherein a longest distance from the center point of the upper surface of the member to the side surface of the member is less than a longest distance from the center point of the lower surface of the member to the side surface of the member.

14. The lighting device of claim 13 , wherein the member is a polygonal pillar having a plurality of the side surfaces.

15. The lighting device of claim 14 , wherein a number of the side surfaces of the polygonal pillar is equal to or greater than six.

16. The lighting device of claim 14 , wherein the light source is separately provided on each of the plurality of side surfaces of the polygonal pillar.

17. A lighting device comprising:

a heat sink including a body, a plane surface on the body and a member disposed on the plane surface, wherein the member includes at least a side surface and a top surface, wherein the member has a height that extends in a direction from the plane surface to the top surface;

a light source including a substrate disposed on the side surface of the member and a plurality of light emitting devices disposed on the substrate, the plurality of light emitting devices having a center point of all of the light emitting devices on the substrate;

a circuitry in the heat sink;

a socket to electrically connect to the circuitry;

a case to couple to the socket; and

a cover to couple to the heat sink,

wherein a shortest distance from the plane surface to a lowest point of the substrate is greater than one-third of the height of the member from the plane surface to the top surface, and

wherein a shortest distance from the plane surface to the center point of the light emitting devices is greater than two-thirds of the height of the member from the plane surface to the top surface.

18. The lighting device of claim 17 , wherein the circuitry is received in the case.

19. The lighting device of claim 17 , wherein the member has a plurality of through holes, and wherein the circuitry is electrically connected to the substrate via the through holes.

20. The lighting device of claim 17 , wherein the cover is coupled to the heat sink by an adhesive material.

21. A lighting device comprising:

a heat sink which comprises a top surface and a member which has a side and is disposed on the top surface;

a light source which comprises a substrate disposed on the side of the member and light emitting devices disposed on the substrate, and has a reference point; and

a cover which is coupled to the heat sink and comprises an upper portion and a lower portion, which are divided by an imaginary plane passing through the reference point and being parallel with the top surface of the heat sink,

wherein a distance from the reference point of the light source to the upper portion of the cover is larger than a distance from the reference point of the light source to the lower portion of the cover,

wherein the member is a polygonal pillar or a cone of which the area of the bottom surface is greater than that of the top surface.

22. A lighting device comprising:

a heat sink which comprises a top surface and a member which has a side and is disposed on the top surface;

a light source which comprises a substrate disposed on the side of the member and light emitting devices disposed on the substrate, and has a reference point; and

a cover which is coupled to the heat sink and comprises an upper portion and a lower portion, which are divided by an imaginary plane passing through the reference point and being parallel with the top surface of the heat sink,

wherein a distance from the reference point of the light source to the upper portion of the cover is larger than a distance from the reference point of the light source to the lower portion of the cover,

wherein the light source comprises a lens which is disposed on the light emitting device and of which the beam angle is greater than 150°, and a lens unit which is integrally formed with the lens and includes a bottom plate disposed on the substrate.

23. The lighting device of claim 22 , wherein the lens unit comprises a reflective layer disposed on the bottom plate.

24. The lighting device of claim 22 , wherein the lens is an aspheric lens or a primary lens.