LED light bulb

1. A light-emitting diode (LED) light bulb, comprising:

a light bulb adapter;

a housing fixed on the light bulb adapter and having an accommodating space, wherein the housing has at least a vent hole;

a convective heat dissipation piece comprising a first heat dissipation part and a second heat dissipation part connected under the first heat dissipation part, wherein

the second heat dissipation part is located in the accommodating space;

an outer border of the first heat dissipation part is exposed to the outside and a lower border of the first heat dissipation part has a first gap with respect to the upper border of the housing;

the second heat dissipation part has a second gap with respect to an internal wall of the housing;

the first gap, the second gap and the vent hole of the housing are connected;

a plurality of first through-holes extend from a top surface to a bottom surface of the first heat dissipation part and connect with the first gap; and

a second through-hole extends from the top surface of the first heat dissipation part to a bottom surface of the second heat dissipation part and connects with the second gap;

a light-emitting module disposed on a top surface of the convective heat dissipation piece and having a third through-hole connected with the second through-hole; and

a light bulb cover disposed on the top surface of the convective heat dissipation piece and covering the light-emitting module.

2. The LED light bulb according to claim 1 , further comprising a power conversion module disposed in the accommodating space and under the second heat dissipation part.

3. The LED light bulb according to claim 1 , wherein the plurality of first through-holes are disposed on the top surface of the first heat dissipation part and surrounds the light emitting module, and air coming from the first gap would enter from the plurality of first through-holes into the light bulb cover.

4. The LED light bulb according to claim 3 , wherein hot air generated by the light-emitting module would be directed through the second through-hole and dissipated out from the vent hole of the housing.

5. The LED light bulb according to claim 1 , wherein the bottom surface of the second heat dissipation part has an air flow guiding part for guiding the air flow from the second through-hole to the region of the second gap and dissipated out from the vent hole.

6. The LED light bulb according to claim 1 , wherein the light bulb cover has a condensing lens and has an arc convex surface.

7. The LED light bulb according to claim 1 , wherein the light bulb cover and the first heat dissipation part are joined by an engaging structure.

8. The LED light bulb according to claim 1 , wherein the internal portion of the housing has a plurality of engaging columns for locking with the convective heat dissipation piece.