Richard, John -- not sure if you were replying to me or Eve, but if to me, then the bulb for my 23C III is a threaded base. It is slightly smaller than a standard household bulb, but does have a standard E26 medium thread base. It should be easy to find a suitable LED replacement that will fit. But finding one with even illumination (it's a condenser head) might be a bit trickier and may take a few misses until I get a good one.
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