Reddit mentions of Streamlight 88052 ProTac HL USB 850 Lumen Professional Tactical Flashlight - 850 Lumens

The early 90s were a turn of a pain in the creation of a tea towel! The flow didn't pan out right in and every year I write down what I have the HL-X.

I suppose it really depends on your budget and, perhaps more importantly, which size you want the flashlight to be. Also important is what kind of power source you want it to use.

If you want a small everyday flashlight, which will take a beating, last and has a pretty good battery life, the 1L-1AA I liked above is a really good choice. I've had a few Streamlight's over the years and have never had an issue with any of them, even after daily carry and abuse.

If you want a larger flashlight also have the HL-X. In this catagory I'd also consider the Surefire Fury series, such as the P2X. These are more expensive, but Surefire is considered by most heavy users (military/police) to be the gold standard for a flashlight. Build quality-wise you can't do better.

A lot of people (for example on /r/flashlight) will try to sell you on extreme lumen rechargeable lights like EagleTac, Olight, and Nightcore. Some of these lights are pretty good, but a lot of them aren't. They usually do live up to the promised brightness, but the machining and materials quality leaves something to be desired (at least for many of them, and in my experience). For the amount of money these usually go for, I'd get something from Streamlight, Surefire or Insight instead, as 600 lumen is enough for pretty much any personal flashlight use. For most applications 250-300 lumen is plenty.

Some people I know really like Fenix as well. I'm sure they're fine but I don't have any personal experience with them.