Christmas I'm in a month - long project to replace all the lights in my parents house with LED lights. Whatever Costco has, I would buy here. For some reason my parents have a large number of R20 lights at home. Without doing enough research I tried these BR20 lights. Unfortunately they did not fit the R20 mounts. Walking through the house I noticed that they had installed some CFL lights in front of the entrance and decided to keep them rather than return them. That's when my parents found out what I was doing (I wasn't paying attention), but they're glad they can turn on their headlights all night without spending a lot of money. I'll eventually show you over 50 lightbulbs I replaced in your house for Christmas.