I have a screw thread lightbulb where the thread is 11.5 mm across – would that be likely to be E11 or E12? Or something else? Thanks.
Light Fixture – Identifying Lightbulbs by Thread Size: E11 vs. E12
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That is a reflective sheet to help use more of your bulbs' light output. So if you want the same sort of brightness as you had, yep, you do need to replace it. But for a closet, I personally wouldn't bother.
The maximum wattage should be stamped somewhere on the light. If in doubt, use LEDs or similar bulbs that don't push out as much heat as the equivalent CFL or incandescent.
You need to acquire a light fixture mounting bracket. The type that you need would look like the bracket as shown in the picture below:
Install it through the longer slotted holes into the existing electrical box holes. You can use the screws from the old light fixture.
Due to the deep recess of the electrical box the bracket arm with the long slotted holes will reset against the ceiling drywall. The other arm needs to be oriented so that the ends project down from the ceiling so that there is clearance for the screws from the light fixture to go into the threaded hole but not have to enter the ceiling surface. This picture will help to show the mounting strategy:
The new fixture then can mount into one of the sets of threaded holes in the other arm of the bracket.
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Best Answer
Thank you, Wikipedia.
So E11 is a thing, it is used for high intensity halogens. That bulb is a common night light or festoon (Christmas style string) light, so it will be E12.