Does not need to have huge output.
For walking the dog on a golf course where low light is sufficient most of the time but now and again a blast of brightness is needed.
If there is light like this out of the box great otherwise maybe one that can be programmed to only have 2 modes.
Thanks
Does size matter? Price?
Thinking the 2 modes thing is going to really narrow your options though. Are more modes allowed if the mode switch is seperate from the On/Off switch?
The idea is that any other modes must not be able to be accidentally activated or have to be cycled through.
Separate switches could work. Any light taking a single 18650 size would probably do the job.
This is light is not for me but for a friend.
A friend of mine wanted single mode like his old Surefire and is very happy with his Convoy S2 now he’s got it programmed to on/off.
Acebeam Pokomon. Can take 2 AAs in an emergency, but comes with a double-length Li cell with built-in usb charging.
Always starts on low, but a quick bap before clicking through puts it into high.
Butter-smooth beam, no discrete hotspot.
In my experience, they’ve made the low too low, seemed to be about 10 lumens, advertises 20, should be 30/lumen
It’s a nice wide smooth beam, no big hotspot, so yeah, it’ll seem less intense, but I use it mainly for close-in work to just lighting up the floor so I don’t need to turn on all the lights. It’s plenty bright for me.
That’s why I’m not sanguine about mules vs a nice aspheric or wide-angle TIR lens. Mules just spread light all around so that even a bright light doesn’t seem to light up much. Just scooping that light together a bit more into what’s still a wide beam, could almost double the intensity and not waste half of it off to the sides.
Agreed! 
How about something like an Eagtac P200LC2- head twist for high or low outputs
I would totally buy a simple, twisty, 18650 ultra-compact light with only 2 modes. In an ocean of lights with anduril, 2 switches, aux lights and so many functions, a simple ultra-reliable small, sturdy, good runtime, well regulated light would be awesome to permanently stay in my backpack.
I once saw a 3-mode twisty 18650 light on AliExpress, or perhaps banggood, or gearbest … it was a dive light, approximately the format of a Convoy S2+. Unfortunately it was $30 so I hesitated then I never saw it listed again…
AAA: Olight I3T
AA: Olight I5T
18650: Surefire EDC2-DFT
A light that I really like and use as simple 2-mode is Wurkkos TD03 using SFT-40 emitter. Just rotate tail switch between Off / Lo Lo, or Lo, or Mid / Hi. The first stop after “Off” can be set to a low or middle mode, then turn one more stop for Hi.
You can cycle with tail-button if you choose, but I just set the two stops and forget it.
I find it to be a well-made, simple light for general use.
Thanks for all of the suggestions. Crazy that there is no simple hi/low UI!!
Unless you want to go old school and roll yer own.
Something like a S2+ with a 105C driver, just solder the star that gives 2 modes, 10%/100%.
Hmm…
Many Convoy flashlights with a tail switch offer 3 modes, but not 2 modes, as an option.
(Sorry, but that’s the best that I can come up with.) 
Funny, but I just had a discussion t’other day how no one even wants to mod lights anymore, now the days of stars, pills, drivers, hosts, etc., are gone, and everything nowadays is buying the one of hundreds of tubelights that’s got enough boxes ticked from everyone’s wishlist.
Modding S2+es and '501s and '502s and C8s and whatnot used to be the norm, but now it’s picking 1 of 100 readymade lights.
But yeah, and old school driver just needs a solder-blob to turn it into a 2-mode driver that just needs a half-press on the tailswitch to flip back’n’forth through. One and done.
Convoy drivers used to be simple 105s or similar, and as long as they weren’t the annoying 3/5 mode with blink-on-low, it would just need a single solder blob on one of the stars to turn it into a 2-mode light.
Absurd! There is no lights with Pi number of modes! 
What is low ? What is high. 1 lumen and 4000?
Well, there’s pi a la mode…
Seems that what may be the simplest solution is the S2+ in say mode 5 (1%, 20%, 100%) with mode memory set on.
Soft press and hold at 20% reverses direction back to 1%.