I have been using this kind of light bulb for very long, I used to think they are really an integral light bulb with a spherical glass shell outside. However, as you can see from the above, they are not. They are more like normal light bulb with a glass shell.
This morning, one of the light bulbs has the glass shell dropped from the ceiling. Thank God that there is no one there at that time. I turned the light on and it still works, but of course, I have removed it from the socket (took the above shot) and throw it away.
Therefore, if you have these kind of bulb, better check periodically to see if their glass shell is loose or not, otherwise, very serious accident could result.
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