Bought some LED recessed lighting through HD, by Lithonia lighting back in
June. Nice lights, a bit pricey, supposed to last 35k hours.

Here we are in November, and one of the (21) lights I put in, decided to
start humming.

Home Depot no longer carries this style (bought on internet), they say it's
discontinued.
http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?productId=202744627&storeId=10051&l angId=-1&catalogId=10053&cm_sp=BazVoice%2d%5f%2dQA%5fPSVP %2d%5f%2d202744627%2d%5f%2dx#.ULYkZCCayiA

Tried to send a email to Lithonia, through the information box on one of
their pages. It comes back undeliverable.

So, since I'm not having any luck with customer service, figure someone can
name the tune being hummed. :/