I recently purchased 24 Halo RL560WH6930R LED lights. Almost all of them buzz. On the back of the box it says "dimmable to 5% with select dimmers". The instruction booklet says
"please see the Halo Dimming Reference sheet at www.cooperlighting.com". We took one of our buzzing lights and plugged it into 110 directly, there was no buzz, it has to be the switch.
Imre