I think most of ours are the Nvision brand from Home Depot.
I love the 9 year warranty. I had one big 26w (100w equiv) bulb burn out prematurely since it was in a clothes closet being switched on/off all the time.
I went to the manufacturer website, put in the info from the receipt and bulb base. A few days later I got a brand new bulb in the mail. No need to send back the old one.
So keep your receipts and the paper inserts from the original bulb packages.