This is one of the top options for my 2020 flashlight review. I'm using this one mostly in studio. It fits in the tube and it is extremely bright.

Specs (from Olight)

Why I love this flashlight?

It is extremely bright
It has constant strobe, and they are equally spaced
The magnetic pressure switch is a game changer. This is by far the best one I have used. With any other flashlight, you have to take off the normal end part of the flashlight and replace it with the pressure switch (that usually breaks after a few weeks)
It is one of the most solid flashlight I own (Olight makes real high-quality products)
I love the magnetic charging dock! It's great to not have to take the battery off the flashlight. And this is the same magnetic charger that I use for my headlamp! Boom!

Drawbacks of the M2R Warrior

The beam is just a bit too wide. That means that it is not as bright as other options at the same power (Nitecore MH12GTS for instance)
No dimmer. I wish I could have a version of this one with a dimmer ring... that would mean that I could use a single flashlight for everything! Until then, the Nitecore MT22C is still the best option for late night tube light-painting.

Flashlights