Patent ID: 8541932

Claim:
A lamp comprising: a heat dissipater including a base and an engaging member, with the base including a first air guiding portion and a fixing portion, with the engaging member mounted to an outer periphery of the base, with a second air guiding portion formed between the engaging member and the base, with the base including a seat and an annular wall formed along an outer periphery of the seat, with the first air guiding portion formed at one side of the annular wall, and with the second air guiding portion formed at the other side of the annular wall; a lighting element mounted to the base of the heat dissipater; a housing engaged with the engaging member of the heat dissipater and having an opening, with the housing and the heat dissipater together defining a compartment in communication with the first and second air guiding portions, with the first air guiding portion including at least one passageway formed in a central portion of the seat, with the at least one passageway extending from a top face to a bottom face of the seat in an axial direction of the lamp, and with the second air guiding portion being in the form of a plurality of radial passageways; a cooling fan mounted to the fixing portion of the base; and a circuit board mounted in the compartment and electrically connected to the lighting element and the cooling fan, with the circuit board electrically connected to an electrically conductive member having an end extending out from the housing, wherein the annular wall of the base extends and protrudes through the opening of the housing, with an end of the annular wall extending in an axial direction of the housing beyond the opening of the housing.