This Antique Lamp Socket features an Energy Saving Dimmer that allows for seamless and consistent dimming of light. It is designed to operate efficiently, saving costs for the user. Compatible with both incandescent and newer dimmable LED bulbs. Eliminates the need for expensive 3-way bulbs. Easy adjustment of light levels with dimmable switch. Simply turn knob up for maximum illumination or turn knob down for relaxed, low light and maximum energy savings. Turning light down reduces brightness and may extend bulb life.