A down lamp, comprising a housing and a wiring terminal disposed in the housing, wherein the housing comprises a front shell and a rear cap , the rear cap has an opening at a location corresponding to the wiring terminal and the opening is provided with a terminal cap that is matched with the opening and is in detachable connection with the rear cap , the down lamp further comprising: a first mounting base connected to the rear cap for embedded-in mounting of the down lamp, and a second mounting base detachably connected to the rear cap for surface mounting of the down lamp, wherein the first mounting base is detachably connected to the rear cap through screws, and the second mounting base and the rear cap are in rotary buckling, characterized in that the rotary buckling between the second mounting base and the rear cap is such that there is a clamping slot in the rear cap , that a lug matched with the clamping slot is disposed on the second mounting base , and that the clamping slot is provided with a gap for stretching in of a limiting lug at one side, wherein the clamping slot is provided with a positioning bar for clamping the limiting lug into the clamping slot at the other side. a housing and a wiring terminal disposed in the housing, wherein the housing comprises a front shell and a rear cap , the rear cap has an opening at a location corresponding to the wiring terminal and the opening is provided with a terminal cap that is matched with the opening and is in detachable connection with the rear cap , the down lamp further comprising: a first mounting base connected to the rear cap for embedded-in mounting of the down lamp, and a second mounting base detachably connected to the rear cap for surface mounting of the down lamp, wherein the first mounting base is detachably connected to the rear cap through screws, and the second mounting base and the rear cap are in rotary buckling, characterized in that the rotary buckling between the second mounting base and the rear cap is such that there is a clamping slot in the rear cap , that a lug matched with the clamping slot is disposed on the second mounting base , and that the clamping slot is provided with a gap for stretching in of a limiting lug at one side, wherein the clamping slot is provided with a positioning bar for clamping the limiting lug into the clamping slot at the other side. a first mounting base connected to the rear cap for embedded-in mounting of the down lamp, and a second mounting base detachably connected to the rear cap for surface mounting of the down lamp, wherein the first mounting base is detachably connected to the rear cap through screws, and the second mounting base and the rear cap are in rotary buckling, characterized in that the rotary buckling between the second mounting base and the rear cap is such that there is a clamping slot in the rear cap , that a lug matched with the clamping slot is disposed on the second mounting base , and that the clamping slot is provided with a gap for stretching in of a limiting lug at one side, wherein the clamping slot is provided with a positioning bar for clamping the limiting lug into the clamping slot at the other side. <EOS>