Patent ID: 8292465

Claim:
A lamp, comprising: a housing including a first shell and a second shell assembled together, with the first shell having an end forming a light-transparent portion and another end forming a first engaging portion, with an air outlet portion formed in a wall of the first shell, with the second shell having an end forming a second engaging portion and another end forming a base, with an air inlet portion formed in a wall of the second shell; a heat sink mounted inside the housing and including a base plate and a plurality of fins surrounding the base plate to define a compartment, with the fins being close to the air outlet portion of the housing, with each of the fins having a first end facing the air inlet portion of the housing and a second end connecting with the base plate; a light emitter fixed to the base plate of the heat sink, facing the light-transparent portion of the housing and being electrically connected to the base of the housing; a fan fixed inside the compartment of the heat sink; a blocking ring mounted inside the housing and positioned between the air inlet portion and the heat sink, with a center hole of the blocking ring being aligned with the compartment of the heat sink, with the blocking ring having two sides respectively forming a first flange and a second flange in an axial direction, with the first engaging portion of the first shell coupling to the first flange and the second engaging portion of the second shell coupling to the second flange, wherein the blocking ring further has a side forming a protrusion ring extending to the light-transparent portion in an axial direction of the fan and partially covering an outer periphery of the heat sink.