My Olight H2R , bought August 2017, recently failed after a lot of use, and abuse. I was quite disappointed when it failed, I had lots of immediate need for such a light of equal abilities, and no desire to shop around locally, and was planning on driving 2600 miles three days later, to the other side of the country.
I did have an 18650 battery holder, with pigtails and an old harbor fright led headlamp which took 3 AAA batteries, so some zipties and solder and I had some 30 to 45 lumens available on my head to continue preparing for the drive, instead of holding a flashlight in my mouth, but I missed the ~650/150/30 lumens of the Olight.
I ordered an ArmyTek C2 Pro Max with the warmer LED, which is not as bright as the cool white version, but thats also kind of like picking flypoop from the pepper at 3720 vs 4000 lumens on turbo2.
My H2R was also the warm white version, but the battery was unable to support turbo's draw for the last 3 years, and the turbo output is kind of ridiculous, mostly being a wow factor, and short lived due to heat, even with a new fully charged battery.
The ArmyTek has many more light modes available, it is warmer, its 21700 battery has 1600 more Mah than the 18650 battery which came with the Olight, at 5000Mah. The beam is way more floody than my Olight H2r, and regular high is 450 lumens instead of 650, but more than enough for 8 foot long workbench tasks.
The Armytek can support turbo with well less than a fully charged battery, but how long is determined by how fast it heats up. It will automatically drop to 900 lumens when it gets too hot.
The Olight H2r's headband is more comfortable, on my head, and I had worn out one and bought a second, and now the armytek is in the Olight headband.
The Armytek C2 ProMax comes with an adapter so one can use their 18650 cells in it, and also a bicycle handlebar mount.
It is by no means an inexpensive light, but the build quality and function is very good in my opinion.
The extra size and weight of a 21700 over an 18650 is no issue, to me.
The Olight Perun2 was on my list as well when shopping, but the lack of a warm white version, and the included adapter for using my 18650 cells inside of it, tipped the scales, and had me spend the extra for the Armytek.
https://www.armytek.com/flashlights/models/wizard/armytek-wizard-c2-pro-max-magnet-usb-warm/
One major plus for me is the low light modes. The Olight had a 1 lumen minimum mode, too low for comfortable reading in bed at night, but the next lowest setting, was basically too bright for the same task. The Armytek has two low output modes, and the second dimmest is perfect for reading at night, and ythewarmer color over the Olight helps in the blue light/ falling asleep department.
Tha ArmyTek takes a bit of practice to figure out how to access all its available light modes in its advanced menu, but has the simple option menu as well.
I don't know if the 21700 battery format is going to stick around, but the 18650 option with the adapter and my existing cells, should get me through until the next latest greatest and brightest headlamp generation, is desired/ needed.
I'm probably going to get a cheapo 20 to 30$ 18650 headlamp as well, as not having a backup, proved a real burden.