Sofirn found SF22 hosts stayed in the corner of warehouse for a long time, maybe some of you guys will like this host for DIY. I'm not faimilar with what DIY host has.
It seems usually no need of emitters and driver, but other parts with shell. But I'm not sure. Anyone can tell me about what you usually need for DIY?
I will find the BOM sheet of SF22 and offer the all the parts you need.
The difference between a host and a full flashlight is only that the host has no leds and driver. Optionally it can include a side switch or a MCPCB. You are doing it right with your C8F 21700 host.
I guess the MCPCB of this host is a non-dtp aluminium so not made for high currents. You could mention the driver size.
I already bought this host on your website. If you happen to come across some other hosts I would be interested.
Barry - From the listing at SofirnLight.com, it looks like the tail switch is not included. It might help to list which ones you offer that will fit and whether they are forward-clicky or reverse-clicky.
Edit: also, it might help to tell what the size of the emitter MCPCB is used, and a picture of the included reflector. From the description the reflector is for 5xLED?
Lots of info in the link to Dale’s review that Barry provided.
If a person was pretty crafty with a lathe and drill press you could make a nice copper pill and mount 18 small copper mcpcbs to it, put in a good driver, and have a monster of a light.