Yes. The base code of this bulb is E12, Candelabra.
Due to the new California Energy Commission regulations.
Yes they will work.
In my opinion, since the bulb is rated at 4 watts, it will have no issue working in a 25 watt fixture. Remember that the 40 watt detail represents the wattage used by a standard filament bulb for the equivalent light output. Also, the heat generated by the LED bulbs shouldn't be an issue, either.
Yes, at least they worked on my ceiling fans...I cannot say for sure they would work on yours.
Made the Room Brighter!
Need a dimmer rated for less probably have an old incandescent dimmer which does that
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Any , I think . I have them in a ceiling fan with a old wall dimmer.
These can be used in any fixture than has a candelabra base.