A lamp assembly apparatus is provided to control the position of a lamp and then combine the lamp with a lamp housing of a lamp unit. A lamp assembly apparatus(1) includes an aging process(85) for aging a lamp unit(100) for a predetermined time. A lamp regulating process(30) regulates and fixes a lamp when the aging process is completed. A lamp check process(70) checks the lamp unit when the lamp regulation process is completed. The lamp unit is mounted to an optical engine to be used at a projection system and emits the light beam. The lamp includes a lamp body for emitting the light. A lamp bracket is protruded to the outside of the lamp body. A combining hole corresponding to a combining member of a lamp housing is formed at the lamp bracket.
