What’s the difference between H1/H2 and H3/H4 and is it difficult to swap their reflectors to TIRs?
Finally crumpled and bought a FireFlyLite L50 Sol in the polished alu, FFL5009R 5000K. Dammit BLF! 
H2 is the same as H1, but with charging port
H4 is the same as H3, but H4 has TIR lens instead of reflector
The edge of the TIR lens needs to be removed a bit so it can fit properly,but it’s very easy
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The convoy H4 is available with Anduril 1. Although the regular UI is not terrible.
You can also get a variety pack of reflectors and different tirs for it. And convoy also now has magnets available for it.
So I’m not saying it’s a real great choice as a headlight but as a general purpose utility light I think it has a lot going for it. As long as ipx4 is sufficient for you