Wow! Nah, I don't believe in limits or thin wires .
Ok, here's some details. It's a TA Convoy L6 triple channel using a SIR800DP, 20 AWG wires, 20 AWG spring bypass. It's got the Simon SMO reflector.
On 2 LK 5000's at 4.17V, I got 18.0 amps on the clamp meter.
Lumens: 8,940 @start, 8,090 @30 secs. Throw at 5m: 186 kcd (862 meters)
There is no black hole, well under 1 foot to a white wall there is, but nothing further away than 1 foot. It's got the usual new LED yellow around the hot spot. Could be the 3B tint, or just the nature of the LED's with our typical reflector designs.
The thing gets hot, maybe the hottest I ever felt after 30 secs. I didn't let it cool down much before getting the throw readings, and it was getting darn uncomfortable holding it for the 30-40 secs or so.
Is this thing usable? Well for a few moments, yes. I had two EVVA unprotected 4000K cells I tried. They were at 4.05V and I got about 11A on the clamp meter, and maybe about 6,800 lumens at start.
Surprisingly, ramping seemed to be working ok, but as has been pointed out, there's not many steps in the ramping table at the high levels, so it jumps bright fairly quick at the end.