The iDevices Socket and Dimmer Switch incorporate a convenient trimming feature that easily adjusts the minimum and maximum brightness levels for some LED and CFL bulbs to prevent “bulb flicker” at low levels. Dim levels allow you to optimize the brightness range of your bulb so it smoothly ramps when brightening and doesn't flash when dimming.
Click here for more information on adjusting dim levels after setup is complete: Set Bulb Dim Levels