They drop right in replacing the reflector and lens with a solid piece of plastic, that fits right over the LED
The conical part acts like a reflector; the front surface is ridged with multiple parallel angles so the light spreads out in a wide fan
If you are looking for something that you don’t have to modify, the E14/S41 would be a good choice IMO.
The beam on those should be a bit more floody than an S2/S2+/S3/S4 with an OP reflector.
Olight s1r is good one choice.Due to the small size , it can easily carry. And as a part of EDC, High model of Olight s1r have 300 lumens so that it can deal with almost every circumstance