itp/olight a3 eos (upgraded) flashlight
formerly produced by, itp, now owned by olight
price is about $20-$30
- very small and lightweight, put into pocket/on the neck and forget
- have clip
- turning on and mode switching is performed by head twisting. at the same time it works as a safety switch to avoid occasional turning on. beware to untwist it enough, because slightly untwisted it can be occasionally turned on by clutching it, so battery may deplete.
- powerful q5/r5 cree led (depends on modification), quite long-thrower, but good for close distances
- 3 modes, from very low (1.5-2 lumen, enough for small distance), mid (about 20 lumen, mid distances) and max (80-100 lumens, awesome on longer distances). in my experience mid mode on single battery will be at least 2 hours, but description says more. respectively low mode is very long lasting. when turning on, starting from low mode, which is good for most cases.
- use of AAA battery and powerful rechargeable lithium 10440 battery (4.2v, good capacity). though later modifications may be declared as AAA only, but guess still possible to use 10440 to get max of it (AAA battery can't supply max mode well). this is because on max mode it quickly gets overheated, so use max for a little time.
-can run on almost dead battery giving little light. many of flashlights can't.
- use 10400 lithium battery as a regular, and 1.5v AAA lithium non-rechargeable battery (Energizer) as backup (it is cold-proof and long storage). regular AAA is weak, damaged by cold and with time. have some backup batteries for a long trip.
- use rope to put it on the neck to make it quickly accessible. also it can light in this position. to make directed light keeping hands free it is possible to squeeze it in lips or put above ear under hat (it will not be lost because of neck rope).
- it is possible to flip clip to make it better attachable to hood/hat/sleeve and other similar places. remember about rope, to avoid it getting lost.
- it is possible to put it on wrist/sleeve (use band/clip/rope), to get hands free and have good control of light direction and stealthiness (i.e. airsoft/milsim games).
- paste head with some paper (from stick or duck tape) to make good ambient light. it is good for reading books and for working.
- if you can, lubricate its thread with silicone or something similar sometimes. it will feel better.
- also there is similar a1 eos flashlight, using more powerful 16340/CR123A batteries. it is almost small and lightweight as a3, but the difference is big, it is not so convenient as a3. if you want more powerfull flashlight, it is better to use proper headlight (see below).
good for occasional/backup and daily use. for intensive work/camping/hiking it is better following flashlight/headlamp, it is just about $50-$60 (Spark SG-3): my quora answer: Whats a good headlamp for hiking and camping? (https://www.quora.com/Whats-a-good-headlamp-for-hiking-and-camping/answer/Dmitry-Bryliuk)