Thanks for the prompt reply, Chicken Drumstick.
I want this light to use while checking a few vulnerable points in my farm for stray livestock. This is the job I had in mind in my first post on BLF, back in May … but since then I have realised that a small torch is more usable than a big one. If I do find something amiss, I need to be able to put the torch in my pocket, and I can’t do that with a monster like a TK75 or BTU Shocker.
That means something about the size of my Convoy C8 (and preferably as small as my M1), running on an 18650 (like most of my other torches).
Run time is not critical, but I would hope that it could manage at least 40 minutes on high.
To do this job, I need a throw of more than 400metres, preferably 500m. I don’t need much spill; a fairly narrow beam pattern is fine, and with only a single emitter, the beam probably needs to be very narrow to get that sort of throw. That seems to me to pint towards an aspheric.
I am aware that this may be a rather specialist use, but I’m sure I am not the only person with a similar set of requirements.