Well, unfortunately it's a bust. The headlamp has a major problem with heat dissipation, so those 2000 lumens are only on paper, or maybe for a minute from a cold start. If you've been using it for a bit and then turn on "turbo," it stays active for about 25 seconds, after which the flashlight slowly starts to dim to protect itself from overheating. You can see this perfectly if you connect the flashlight to a power bank through a voltage and current meter. Start 12V 1.7A - 2000 lumens A few moments later, it can drop to 0.5A... In practice, a power bank that delivers a maximum of 6W is enough, because after about 2-3 minutes that's roughly what it consumes. In general, the idea of external power is great and this was the main reason why I chose it, but honestly I regret it. I wanted strong light, and power from a power bank was supposed to mean it would last all night. I've always been an Olight fanboy, then a friend bought himself a Fenix and there the build quality and everything is top notch too. But here... they just didn't try hard enough. The heat sink is the back part, which because it's at the back has severely limited airflow. Why isn't the whole device made from metal, which would make heat dissipation much easier? I've never come across something like this before. My Olight headlamp heats up as a whole and even though it has less output, just 1500lm, it actually delivers a much stronger beam, especially after several minutes of use. If this had been stated in the description on the website, I wouldn't have had any complaints, because then I simply wouldn't have bought it. (It's in the manual, which is why Militaria should get a smack and include a power curve over time in the description.) It's a bit like buying a car that's supposed to have 200hp, but you can only access that power for 15 seconds. I give it a stretched 4, although I should probably painfully rate it a 3.
