It took us a while because we have these ceiling light fixtures (down lights?) and although we had changed light bulbs around the house we had not changed those. Then, at Costco we found total replacement LED kits. So we replaced the entire light, not just the bulbs. That took a while because we had a lot of them.
We still have not figured out what to do with the kitchen since no LED bulbs or replacement kits seem to be available for them. And, out of the whole house, those bulbs are the most short lived. We are always changing them. And the replacements are pricey and don't always even work. Sigh. Someday we hope to replace the whole lighting there.