Just a few suggestions:
The battery holder should be careful with the interior design, not to damage the battery side wall during insertion.
Each slot should be well separated, and the battery will not lean over the other slot. This is a bit, but it’s pretty good for use.
External dimensions: Do not have a very large diameter because many people can not handle it comfortably.
Head: good if the size is the same as the size of the body and not bigger. This makes it easier to carry while it is in use, taking up less space.
Optics: Combine mixed OP and SMO reflectors. There is not much on this market yet!
LED: Combine the same loads of LEDs in the SMO and OP reflectors. Eg XPL-HD is the OP reflector and XPL-HI is the SMO reflector. You get beautiful throw and a large flood in one flashlight.
Driver and Modes: Be Easy! Do not complicate it like BLF Q8. I got a lot of feedback on how good the description is, but the menu is still complicated. Anyone who wants to buy it is not programmed. or not want to change the final user firmware! The ramping I think is quite useful. Let the two endpoints be well interpreted and that’s all. The moonlight mode should be really low for a terrific long running time. Heat protection works reliably and independently.
Battery level indicator is definitely useful, the light under the button is probably the most good. I like to see a metal button on the side of the body and a lighted ring.
Exterior: Have a tripod mount, when you have a high weight (over 500g) on the head and body at the end of a decent size and wall thickness hole to use a shoulder strap to it.
I’m happy to review it.