The answer to 'why is my recessed lighting dimming lights' is that there are several common causes, including a faulty dimmer switch, old or failing light bulbs, and loose or improper wiring connections. Symptoms may include lights flickering, dimming, or not turning on at all.
To troubleshoot, first check the dimmer switch - make sure it is compatible with the recessed lights and is functioning properly. Next, inspect the light bulbs and replace any that are old or burned out. Finally, examine the wiring connections in the light fixtures and junction boxes to ensure they are secure and not damaged.