For sale is my Trustfire J20. This light has 12 XHP-50 emitters on noctigons and it’s run with a DD BLF FET four mode driver. The emitters are on noctigons and I have de-domed four of them on the outside, to add a little throw.
$250 and free shipping in the US of A
$240 and exact shipping for everyone else.
You will need three matching high amp 26650’s to run this light and this one is not for amateurs. Seriously, this light should be used with caution. It’s an insane level of amps and should be treated with care, especially when used on turbo.
This one is just insane. I’ve been having fun playing with it, but it’s not exactly a practical light. I built it mostly just to see if it was possible to run the emitters the way they are. It’s 3 batteries in series running to emitters that are all parallel. So “technically” it should actually blow the emitters, because you can’t run 3 batteries into a single HXP-50 and that’s kinda what it’s doing. But I don’t think they make batteries powerful enough to blow these XHP-50’s when there are that many of them that all get lit up at the same time. I wired it so that although they are parallel the current still must go through all the emitters before any of them get lit up.
I’m running it with 3x60amp high drain IMR batteries and still the pull from that many emitters gets the batteries hot pretty fast. What’s amazing is that the driver handles it with no apparent problems. These FET drivers are something else. The same driver that’s in this is in the lights you got from me. So if it can handle this monster you sure shouldn’t have to worry about yours.
I used to get my wife to take beamshots for me but she hasn’t been in the mood to get dragged outside lately. Maybe whoever buys it will post some. It’s bright though, that’s for sure.
Very bright light. I did one about a year ago with 12x XHP50 J4 3A on 14mm TPADs running on a custom multi-FET board and it was a beast. I was running 4x 32650 that one though with a custom spacer gracefully machined by Dale (DBCstm). I thought about doing 3S in 2S out but knew that the amps would be insanely high and the capacity insanely low. With 4x big dog 32650s on the input it kept things semi-sane and the runtime was still excellent at 10,000+ lumens. I'll bet your light is just as bright though or dang close (for a few seconds at least!).
That light took me a long time to build though---not interested in doing another one anytime soon. I was very meticulous all along the way and I probably spent 12+ hours of actual build time on it. At the time, that light had something like $200 worth of LEDs in it...
Sounds like a very cool monster light. I almost went with 4x batteries on this one but decided to try the 3S first and it worked good so I stuck with it. It was a ton of work wiring it that’s for sure. I think if I were building this one to keep the only thing different I would have done was to de-dome all of them. But where I live extra throw is always better, not so for most people.
What batteries would you suggest the new owner use with the one I built? He asked and I just said the highest amp batteries he could find. He’s got some very high amp ones so it’s probably as good as he can do already but if you have something you would suggest I’m sure he’d be happy to hear about it.
Probably the highest amp possible. Did you measure the draw? It has to be very high with 12x XHP50 in 6V configuration and 3S on the input. I am guessing somewhere in the 40A region if it has good bypasses. It has got to be very high.
Thanks, that’s what I though as well. Highest amp batteries possible would be best. I didn’t measure it but yeah it’s got to be in the 40A region. I actually started out with longer wires because I was worried about doing 3S into 2s emitters but I ended up shortening them way down and ran it without worrying a bit. Although even with 3x 60amp batteries, the batteries themselves got warm fairly fast on turbo. Seems like the light handles the heat no problem though.
