Light emitting diode projection bulb

A light emitting diode projection bulb, comprising:

• a heat dissipation base having a bottom surface, a sidewall surrounding the bottom surface, and a annular rim connected to an end of the sidewall to define a first opening facing toward outside, wherein a surface of the annular rim forms a plurality of first convection holes and a plurality of first locating portions;
• a light emitting diode module installed on the bottom surface of the heat dissipation base and emitting light toward the first opening;
• and
• a annular heat dissipation member having a second opening of which the shape corresponds to the shape of the first opening, a plurality of second convection holes surrounding the second opening, and a plurality of second locating portions, the second locating portions being detachably engaged to the corresponding first locating portions respectively, such that the annular heat dissipation member is joined to the annular rim of the heat dissipation base, and each of the second convection holes is aligned with the corresponding first convection holes.