Patent ID: 8641237

Claim:
An LED light bulb providing high heat dissipation efficiency, comprising: a lamp shell including a light transmissive portion and a holding portion with an opening located below the light transmissive portion; a light emitting assembly including a light source baseboard located in the light transmissive portion and including at least one light emitting element located on the light source baseboard and a circuit board connecting to the light source baseboard, the circuit board being surrounded by a heat sink which includes a housing chamber to hold the circuit board; and a power receiving base which is electrically connected to the circuit board and includes a fastening portion to encase and fasten to the holding portion; wherein the heat sink includes a heat collecting section located in the light transmissive portion and formed at an outer diameter smaller than an inner diameter of the holding portion and a holding section extended integrally from the heat collecting section into the power receiving base such that the power receiving base encases the holding portion and fully encases the heat sink without exposing simultaneously, the power receiving base including an inner surface connecting to an outer surface of the holding section of the heat sink so that heat generated by the light source baseboard is absorbed by the heat collecting section and transmitted via the holding section to the power receiving base for dissipating, wherein the light emitting assembly includes a circuit adapter located between the light source baseboard and the circuit board, and wherein the circuit adapter is coated with plastics on the surface thereof in contact with the light source baseboard and the heat collecting section.