HDS lights are supposedly very conservatively driven. Like only 200 lumens or so. But they use a LOT of aluminum. This makes them quite durable. In testing HDS, supposedly the developer threw the light down onto concrete from 30 feet up. Repeatedly. Did it non-stop for something like an hour. It got banged up but still worked fine.
Durability and reliability is the main selling point of HDS, but it isn’t cheap. Expect a typical HDS light to cost a few hundred dollars. And they’re not small. A 1xCR123 HDS is bigger than a 1x18650 Zebralight SC62.
You know, thats a really expensive flashlight and it doesn’t actually has cooling fins. Armytek is beefy too but I don’t really dig the design. I need something with lots of cooling fins but not of the trustfire types.