I bought 4 for a fridge, I decided to replace all 4, although only 1 burned out, but 1 of the new 4 didn't work. All 4 were delivered at the same time. Something with a base that looked different (done wrong?). I tried it in another lamp and it didn't work there either. Unfortunately, as with many cheap products, you should not worry about returning it. I've never seen anything like this in my years of buying lightbulbs. Can't remember a new bulb not working when delivered. The internal filament looked normal (it was a transparent bulb). Maybe it was the packaging or another problem? I don't know, but the other 3 were ok and came in the same box. It looks more like the base didn't touch the connection in the jack, it looked a little different.
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