A Lamp / Bulb Holder is an electrical device that securely holds and provides power to a light bulb. It also offers the convenience and comfort of replacing bulbs easily when needed. Lamp holders are mechanical devices that support lamps and connect them to electrical circuits. They hold light bulbs and make electrical contact to provide a bulb with power. Lamp holders are used with most light sources for incandescent, fluorescent, and compact fluorescent lamps (CFL).