All you have to do is go to the website and scan down to the "Features" section and you'll see:
This TRUSTFIRE torch uses of a 7x CREE XM-L T6 LED, producing very bright beam of light.
The caps on TrustFire is for emphasis. I wonder if someone at Keygos goofed - or if they are trying to gain some credibility by including the TrusFire name???
At best, this thing is a gimmick. I am very familiar with what it takes to generate that kind of light properly. I have built several very high power flashlights (like over 15,000 lumens OTF) using Bridgelux arrays. At 80-100 watts of power this thing will be frying bacon in no time.
For passive cooling Bridgelux recommends at least 10 square inches of heat sink fins for every watt dissipated... you think this thing has 6+ square feet of surface area? The only way to get rid of that kind of heat is using a fan. See Thermal Management of Bridgelux LED Arrays for a good overview of LED heat management
Not sure why anybody would think this is driven @ 3A per LED. This is most likely a TR-J12 with 2 extra LEDs. You'll get a few more lumens and a little less throw than the TR-J12. I'd get one if I didn't have the J12 already.
Well, we know that the TK70 and DRY work fine with triple XM-Ls. They are run at 3 and 4 amps respectively.
At those levels, you do hit some diminishing returns. So if you had more XM-Ls at 2 amps, you would get more lumens, with about the same amount of power.
7 XM-Ls at 2 amps each = 14 amps. The DRY with 3 XM-Ls at 4 amps = 12 amps.
As stated, there is no way they are running at 3 amps each, and 8500 lumens is just a stupid stupid joke that makes them look like idiots.
But it is certainly possible that this light could work pretty well and have 50% more output than the DRY simply by virtue of having more XM-Ls, driven at a higher efficiency amperage.