Good for adding outdoor Christmas lights that turn on with the outside lights. The pin socket is very flat, which is what I was looking for, but almost too flat. May not work if your light requires a long socket neck on the lamp/adapter. I was concerned that the cardboard edge of the adapter might get wet on the outside (we live in western Oregon where it rains a lot and one of our flashlights is missing the glass exposing this socket. But the cardboard is coated in some kind of coating, so that Moisture doesn't seem to bother it, there's no indication it got wet at all if it definitely got wet.
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