I used Socket Head Cap Screws……as Anti Rotate screws not hold down screws… it holds the board MCPCB and centering device together with some float to it, the reflector press’s across it, holds everything down.
I think a few people have run it at more than 20A without damage, but I’m not aware of a proper test to find the absolute maximum output. But my feeling is that going over 20A does not gain a useful increase of output.
I have a few that break 20A, I’ve measured 6300 lumens in one that pulls about 23A if I’m remembering correctly, need to re-measure a few as it’s been awhile. Might have been vloser to 24A now that I think about it.
No - I wouldn't use MJ1's or 35E's. All depends though on the resistance. If you have added resistance in thinner LED wires, carriers, springs, then you won't achieve 20 amps, but maybe that's what you want? MJ1/35E's will just further lower the amps, like using 24 AWG instead of 20 or 18 AWG LED wires.
Yes - over 20 amps. Hit 22A or 23A on a couple single cell lights. Probably could hit higher - think Dale or KB went higher than 23A.
I've seen a bump in the roughly 19A to 22A range, but hard to tell for sure, but figure about 5% bump.
I'd guess peak is about 24-25 amps, might be hard to achieve but possible with multiple 30Ts, 18+ AWG wires, etc.
To really drive 4 of the 90.2’s will take around 80Amps total. The problem is cell capability and capacity, if capable then capacity is usually an issue.
In my scratch build DBC-07 I use 4 Sony VTC5 5D and a single 90.2 still only does 5390 lumens, even from the 124mm reflector. I don’t have amp draw on this one.
I have a SS/Cu X6 that will pull 23.1A for 5100 lumens, the 35mm reflector is probably the bottleneck there.
Most output I’m seeing is in my K1 that Tom inspired me to modify, with a 30T and 16ga leads it can make 6130 lumens at a draw of 18.2A.
My new Lumintop X9L does 4700 lumens on a 40T.
By comparison, my DBC-06 with a 96mm reflector around the CFT-90 draws 18.1A on a Trustfire 32650 and 22.8A on a 30T… 4240 lumens and 4610 lumens respectively.
I can’t figure it Tom. These really pull up towards 4.5V when pushed to 25A. That is why a single cell can’t deliver what they need. Or am I thinking about the CFT-90?
Looks like a single 30T then maybe max's at about 23 amps, but with multi-cell setups like in the GT90, could go higher I'd suspect. I've been modding GT carriers to 4P and getting good results in a converted GT->GT90. I should figure out a way to measure amps in one of these.
28A might be beyond the peak, maybe not. Dunno what kind of driver that is in the K75, or if the measured #'s were stock or not. Guess multiple batts helps a lot.
I think the cells are in series in the k75 and its a serious buck driver. Because of the effort it would take to design that driver, I’d be shocked if acebeam overdid the current.
The Vf was only 3.5v at that current level though, so there must be some series resistance we are missing in multi 21700 configurations. Parallel 30Ts are going to hold wayy more than 3.5V at 28A (14ea). Even a single 30T should overwhelm this emitter in a 0 ohm circuit.
But then again, it only takes 15mOhm @20A to drop 0.3V