interval such that the heat dissipation fins 22 surround to form an accommodation chamber 23 the fan 30 is accommodated in the accommodation chamber 23 of the heat sink 20 the fan 30 is a blower fan and a circuit board 50 is disposed at the bottom of the fan 30 an electronic component no shown is disposed on at least one side of the circuit board 50 and a plurality of first locking holes 51 is formed on the circuit board 50 a plurality of first locking member 52 penetrates the corresponding first locking holes 51 and is then locked on the heat sink 20 and the fan 30 thus the heat sink 20 and the fan 30 are assembled on the circuit board 50 next the heat sink 20 may be assembled inside the body 11 of the lamp housing 10 and at least a locking portion 117 is disposed on the surrounding wall 111 of the body 11 the heat sink 20 has at least a second locking hole 24 at the position corresponding to the locking portion 117 at least a second locking member 25 penetrates the corresponding second locking hole 24 and is then locked inside the locking portion 117 of the body 11 such that the heat sink 20 and the fan 30 are assembled inside the chamber 112 of the body 11 subsequently the cover 12 is combined on the body 11 and covers the opening 113 such that the light emitting element 40 emits a light ray towards the lens 13 of the cover 12.