A lamp cup, adapted to be coupled with a luminous module, includes a cup body and a lens. The cup body includes a top wall and an annular sidewall extending downwardly from a periphery of the top wall. The top wall has a top surface to be joined with a circuit board of the luminous module and defines an aperture from top to bottom therein at a position corresponding to a light emitting component of the luminous module. The lens is securely mounted in the aperture of the top wall of the cup body to be aligned with the light emitting component.