Choose forward-phase dimming for compatible incandescent, halogen, magnetic low-voltage transformer, and forward-phase LED, CFL, or fluorescent loads; choose adaptive-phase dimming when the system may use varied load types, including LED, electronic low-voltage, magnetic low-voltage, fluorescent, or compact fluorescent lighting. Choose 0-10V dimming for fixtures with four-wire 0-10V or 1-10V control, such as compatible fluorescent ballasts and LED fixtures, and verify the fixture’s dimming method before selecting the 120V dimmer switch.

Wiring requirements vary by 120V dimmer switch, so check whether the selected model requires a neutral wire, supports installation without one, or uses neutral wiring to support its controls and connected loads. Plan for the line, load, ground, and any required control or companion connections, and match the dimmer to the lighting load, such as LED, incandescent, halogen, fluorescent, or low-voltage lighting.

Many 120V dimmer switches support single-pole and multi-location lighting control, depending on the model and wiring configuration. Some require a compatible companion or remote switch for multi-location installations, while others communicate wirelessly with additional controls.

Compare the dimmer’s supported load types, phase method, voltage, and load rating with the lighting, such as dimmable LED, incandescent, halogen, electronic low-voltage, or magnetic low-voltage fixtures. Also consider whether the installation needs a neutral wire, multi-location control, wireless integration, or a specific faceplate and finish.