Novel embedded down lamp

The utility model provides a novel embedded down lamp, including a constant current source subassembly, a back lid, an outer barrel, the setting is at the internal radiator of urceolus, LED light source and lamp cup, outer barrel is by including a centre circle on going in proper order, a retainer plate, an inner circle, orbit for one, the retainer plate includes an annular diapire, a side ring wall that extends by the inner circle of annular diapire, the spaced sets up two spring mounting spares on the side ring wall, install a roll spring on the spring mounting spare, orbit and the setting of centre circle inlay card, the inner circle spacing orbit and the retainer plate between, the radiator is the cylinder and the top all sets up the opening with the bottom, the lamp cup is located the radiator, the top detachable of lamp cup sets up the LED light source, the opening at the closing cap radiator top of back lid inlay card, the constant current source subassembly includes a plug connector of being connected with back lid electricity, a constant current source that is connected with the plug connector.