If you cannot place a dimmer between the lamp, this plug dimmer is ideal for the socket. Can be used for floor, table and desk lamps with dimmable LED lamps.
Travo dimmer black 12 volts max. 60 watts. (halogen lamps)
Dimmable Led driver transformer suitable for 1,2,3,4,5 or 6 furniture spots.
Floor dimmer Pulse 3-100 watt suitable for LED.