Convoy C8 Triple head from kiriba-ru
20mm MTN FET+7135 Driver
Triple, SLICED SST-40’s
–3000+ Lumen Turbo Mode
-Copper TPAD MCPCB Triple XML Board
-Bypassed Springs
-Stainless steel bezel
-AR lens
-Polished Triple Optic
-Surefire grip ring
Nice. My SST-40 triple project is still stalled out.
How many amps does it draw?
It surely should be pushing more than 3K lumens!
the biggest bottleneck is tail switch, the tail switch eats a lot of Voltage
Only around 8-9A at the tail, I was a bit disappointed. Unfortunately the TPAD contacts for the driver leads are only large enough to accommodate a 22g wire. I have been thinking about disassembling the setup and drilling out the contacts to accept 18g wires. Although, the light is already insanely bright and generates significant heat that I’m not sure it’s worth the effort.
The first measurement was with a 15A pulse discharge rated battery, closer to 10A continuous discharge. It may perform better with the new 30A Efest batteries I recently purchased. I’ll measure the amperage tomorrow and report back with the new readings
I got a triple SST-40 build that does over 20A at the tail. Something’s fishy here.
*with a 26650 host that is
I have an SST-40 on a tpad in a jaxman Z1, it’s running 18AWG and the pads on the tpad could probably even fit larger. Not sure what you mean by the quote above. What is there to drill out? If you try to drill holes in the contact pads on the MCPCB you’ll just create dead shorts to ground.
The pre-existing holes for the positive and ground contacts were a bit small for 18g wires. Even 20g pretinned leads will not fit well.
I’m open to other ideas on how to remedy this issue.
Topping off a VTC5A will get you a lot more amps for a reading, for whatever that is worth. I bet most of the loss is your battery and not the wires unless they are unnecessarily long.
I aldo have a Convoy C8 Triple head from kiriba-ru and am running XP-L HI cool white emitters. However I’m thinking of doing a triple SST-40 since there rated at over 2000lm per Led. Not sure how your only getting round 3000lm but I’d love more info on this please!!
When measuring the tail cap amperage, the reading never read over 9 amps. However, this may be due to the multimeter wire gauge or incorrectly measuring amperage. My concern was that the 22 gauge driver wires may be at fault. I also have no way of measuring lumen output other than SST-40 test graphs on BLF. If you’re concerned, just use larger driver wire, like 18-20ga. Those larger wires should fit easily in this host. The MCPCB pictured above will take a 20 a wire with some widening of the pre-drilled holes. Not sure about an 18ga wire. Another option is to look at the offerings from led4power.com. Im thinking of ordering a triple luxeon mz or osram KW. Luxeon for flood or Osram for throw.
Does it make any difference using sliced emitters under a TIR optic (compared to non-sliced emitters)?
Nice idea, should be getting WAY more out of it though.
I have single SST-40’s pulling over 9A. I would expect a triple SST-40 to make upwards and over 6000 lumens. As a point of reference, in a 3 18650 SupFire M6 (a triple) I get 8,000. It’s going to take 18ga leads and something in the Sony VTC5A class to do it though.
Smaller, more concentrated hotspot for the sliced emitters.
I guess it’s worth tearing it down and swapping to some 18 gauge wires. It is already bright as hell, wonder how much of a visible difference it will make.
If you are running the circuit through a standard multimeter than that’s likely the problem. The leads add some resistance, but the internal measurement shunt adds even more.
You really need to use a clamp meter, or make a very low resistance shunt and calibrate it.
Definitely measured the current with a low quality multimeter. Further investigation led me to realize that this would lead to an incorrect reading. I do not even own a clamp meter!
I will definitely look into using a different method to measure it. When I first got into building lights I never stopped to think about how to measure their output. Seems to be the more difficult part of the hobby!
sick light and great mod! thanks for showing it.
I agree, very cool light. The triple SST40 is a great combination for single cell lights.
I have a triple SST40 in a convoy L2 (single 26650). With an Aspire 4300mAh 26650 cell I measured 19A using a 10mOhm shunt in place of the tail cap. The shunt resistance is close to that of a tailswitch with bypassed spring so it should be close to the same circuit resistance of the assembled light.
Thanks! I hated it at first. It felt awkward to hold and use on a regular basis. So much so that I listed it on ebay for a bit. Then I got the idea to put the grip ring on it. Completely changes the ergonomics and it fits in my hand really well now.