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The older halogen lights I have that work appear to have longer thread length on the bulbs. I eye-balled about a 1/8" - 1/4" difference in thread length with the new bulbs having shorter thread length. I cannot find specification that addresses thread length on flood light bulbs (or any other bulb for that matter). I have tried some adapters that are advertised as lengthening the socket but their threads were similar to the threads on the new bulbs. I ordered bulbs that were listed as "long neck". Same problem.

How can I fit new lamps in that socket?

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    I don't see a question in there. Can you edit and add a summary or highlight this with an answerable question? Feb 7, 2023 at 22:12
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    And perhaps a photo Feb 8, 2023 at 0:58
  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking.
    – Community Bot
    Feb 8, 2023 at 0:58
  • Are these LEDs? They often have a wide base which collides with something other than the socket itself. Feb 8, 2023 at 6:05

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Likely, the continued pressure of a hot incandescent lamp pushed in that contact a bit. The center metal contact in most screw-type (Edison-base) sockets is a spring that can easily be pried up slightly. N.B. Be absolutely sure the correct circuit breaker is off before attempting this.

Prying up metal contact -- my own photo

It is also possible to put a blob of solder on a fixed center contact, if that is within your capabilities.

Of course, another alternative is to replace the lamp socket.

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