The answer to 'GFCI outlet dimming lights' is that a GFCI (Ground Fault Circuit Interrupter) outlet can sometimes cause lights to dim or flicker. This is a common issue that can be caused by a few different factors. The GFCI outlet is designed to quickly shut off power in the event of a ground fault, which can sometimes be triggered by the normal operation of certain electrical devices like dimmable lights.
Some common causes include the GFCI being too sensitive, an issue with the wiring or connections, or a problem with the dimmer switch or light fixture itself. In many cases, this can be resolved by adjusting the GFCI sensitivity, checking the wiring, or replacing the dimmer switch or light fixture. However, if the issue persists, it's best to have an electrician evaluate the problem, as it may require more extensive troubleshooting or repairs.