Heat dissipation unit for led bulb

A heat dissipation unit for LED bulb, comprising:

• a base seat formed with a receiving cavity and a base section, a first through hole being formed in the receiving cavity in communication with the receiving cavity;
• a first heat dissipation member having multiple heat dissipation sections and a perforation in communication with the first through hole, the heat dissipation sections being arranged around the perforation, each heat dissipation section having a first side and a second side opposite to the first side, the first side being attached to the base section of the base seat;
• a second heat dissipation member formed with a second through hole in communication with the perforation and a spreading section extending from the second through hole, the second side of the heat dissipation section being attached to the spreading section;
• and
• a retainer member fitted in the first and second through holes and the perforation to integrally connect the base seat with the first and second heat dissipation members.