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This happened a few months ago. A one-way bulb in a three-way socket and a short circuit inside the socket tripped the breaker switch; the bulb was a mini-fluorescent bulb.

The one thing I find odd is that I have a lamp with a three-way socket and have used one-way fluorescent and incandescent bulbs in it for years and as far as I can remember, there’s never been a problem with that.

I included a shot of the sticker saying the max wattage the lamps rated for.

- Tristan S.

[Linked Image from electrical-photos.com]

[Linked Image from electrical-photos.com]