Why trim? Adjusting the trim wheel helps you get the most out of your dimmer and light fixture. By setting it right, you can avoid flickering and maximize control across the dimmable range of your bulbs.

Adjusting the Trim on a Simple Dimmer Switch

1.  Remove the faceplate from your Simple Dimmer
2. Turn the light off and dim it all the way down
3. Adjust the trim on the lower left of the switch is a small wheel. Turn the wheel all the way to the right (counterclockwise).
4. Turn on the light
5. Closely observe your light while slowly turning the wheel to the left (clockwise), stopping every few seconds to allow the switch to adjust. Stop when your light turns on and reaches the lowest possible brightness.Identify the ideal light level. 
6. Check your work. Turn the light off then on again to ensure it stays at the correct level. Slide the dimmer up and down while observing the light to verify there is no flickering.