@fjfj765 How’d it turn out?
Still working on it. I’m digging around for my broken Mag Solitaire (Accidentally de-domed it)
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I have decided that the 519 isn’t the right emmitter.
I think the 80CRI E21A would be a better fit.
Has anyone ever torn down a Maglite Solitaire LED’s “bulb holder” assembly? I’m guessing there’s some way to replace the existing (MCPCB?)
If the fine folks here are to be believed, the Maglite Solitaire comes stock with a Luxeon C emmitter, so the solder pads are probably incompatible 
Then there’s the challenge of getting such a small MCPCB - probably 6mm?
This is a much bigger project than I thought it would be -_-
If you don’t mind Warm White with a decent CRI, you could wait for the next sale at Maglite and pick up a Solitaire Spectrum with the silver tailcap. On standard eneloop AAA, mine runs for about 2h15m till off, and 1h45m of that is at or near full. Maglite lists it at 32 lumens, that’s not too shabby at all.
Unfortuantely still pretty dead set on 10440’s.
While I’d rather use a nicer LED, I would settle for just using the stock LED.
The Maglite’s stock LED, which we’ll assume is a Luxeon C, is far less efficient than the Nichia E21A, achieving only 90lm/w, assuming the driver is perfectly efficient.
The Nichia E21A achieves 130lm/w, assuming the driver is a resistor.
So I with a emmitter swap I could get slightly higher brightness, better runtime, and better CRI.
Does anyone here know where I can find E21A’s? Ledrise carries them, but the ones mounted on MCPCBs are the wrong color (way too warm for my tastes) and they’re MCPCBs are too large as well (although belt sanders do exist for a reason)