The answer to 'recessed lighting buzzing noise' is that a buzzing or humming noise coming from recessed lighting fixtures is usually caused by a problem with the transformer or driver that powers the LED bulbs. This can be due to a faulty component, loose wiring, or incompatibility between the lights and the power supply.
Some common symptoms include a constant buzzing or humming sound, flickering lights, and potentially even the lights turning off intermittently. In most cases, this issue requires professional diagnosis and repair by a licensed electrician. Attempting to fix it yourself could be dangerous and may even violate local electrical codes.