You might be able to detach the LED portion from the rest of the lamp. If you can you could buy a matching LED and wire it in. By matching I mean having the same input and output. You would be extremely lucky to find the same shape.

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https://www.youtube.com/watch?v=1RTvgZLvqMY

they are not designed to be User changeable. I’m sure you can brute force your way into it but it also may be glued shut