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Bayonet Style Energy Efficient Bulb Problem

By Dave Rongey - Summary:

Considerations When Replacing Bayonet Pin Bulbs: I tried to change the lampshade on the ceiling light, the original bulb was a Phillips bayonet style energy efficient bulb (NB 2 pin bayonet fitting), It did not fit into the socket easily.

Considerations When Replacing Bayonet Pin Bulbs

I have just moved into a new home, which I am renting and tried to change the lampshade on the ceiling light.

Do you think I need to get a new fitting in the ceiling light itself, or is it simply an issue of not fastening the bulb correctly?

Many thanks,

This electrical question came from: John, a Homeowner from LONDON, UK
Additional Comments: Impressive site – good advice and helpful tips.

Dave’s Reply:
Thanks for your electrical question John.

Replacing Bayonet Pin Bulb


  1. There are a few different pin configurations and types of lamps that use the bayonet style lamp.
  2. It could be that the replacement lamp is the wrong size or type.
  3. The new pin configurations are designed to prevent higher watt lamps from being used, and to save energy.


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