Abstract: A lamp includes a base unit, a light-passing unit, a heat radiator, an electric wire, and a power supply module. The base unit includes a cover and a press ring. The cover includes a bottom plate and a ring-shaped portion. The press ring is connected with the ring-shaped portion. The light-passing unit includes a transparent member, a lens member, a light source pressing member and a light source board. The transparent member is mounted between the cover and the press ring. The lens member is received in the transparent member. The light source pressing member is mounted on the lens member. The light source board is mounted on the light source pressing member. The heat radiator is connected with the transparent member. The electric wire is electrically connected with the light source board and the power supply module.