The answer to 'why is my outlet dimming lights' is that a problem with the electrical wiring or components in the outlet can cause the lights to dim. This could be due to a loose connection, overloaded circuit, or other electrical issue. Dimming lights are a common symptom of an underlying problem that needs to be addressed.
Some common causes include a loose or damaged outlet, a circuit that is overloaded with too many devices, a problem with the home's electrical panel or wiring, or a failing light bulb. It's important to investigate the issue to determine the root cause and fix it properly to restore normal lighting function.