Heat dissipation unit for LED bulb

[0026]Please refer to FIGS. 2A, 2B and 3. According to a first embodiment, the heat dissipation unit 2 for light-emitting diode (LED) bulb of the present invention includes a base seat 21, a first heat dissipation member 22, a second heat dissipation member 24 and a retainer member 25. The base seat 21 is formed with a receiving cavity 210 and a base section 213. The receiving cavity 210 has an open end 211, a closed end 212 opposite to the open end 211 and a first through hole 214. The open end 211 and the closed end 212 together define the receiving cavity 210. The first through hole 214 is formed at a center of the closed end 212 in communication with the receiving cavity 210. The base seat 21 and the first and second heat dissipation members 22, 24 are made of metal material (such as aluminum, copper and an alloy).

[0027]The first heat dissipation member 22 has multiple heat dissipation sections 221 and a perforation 223 in alignment with and in communication with the first through