We couldn't figure out why some of these didn't work for us when we screwed in, but after about 8 years I figured it out . The one we installed had a plastic coating on the end that prevented some of them from making a good connection. After we removed the coating with a scraper, they worked without any problems. Nice bright light! For a change, we can actually see well in the kitchen! Update: After having them on the ceiling for a few months we had to replace them all. They all started flickering - not a dramatic flicker, but enough to give you a headache if you're in a room with the lights on for any length of time (which is especially the case when it's getting dark). We would not recommend them at all.
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