Modified TrustFire TR-J18 +4800 lumen OTF

Right I got my 7xT6 Sky ray a few months ago. It was pretty new on the market and i payed why to much for it.

When I got it I was very disappointed with the light. My 3xT6 was as bright. given the 3xT6 was heavily modified.

The drive current was about 1A trough the LEDs :open_mouth: !!! my ceiling bounch test measured 117 lux

So within 5 min I had the new TrustFire TR-J18 in to parts. And it took me about 2s to find the current sensing resistor. Sorry i can’t remember what it was but i replaced it with a 0.05oHm which I think was half the original.

This mod works gr8. Tail cap current is about 5A and the LED current is just under 2A (4844 lumen)
The ceiling test gave am 209lux.

Strange thing about this is that the lights output ramps over about 1min to max. starting at about 120 lux and the maxing out at 209lux.

next thing would be to replace the 2A tail cap switch before it quits

I did try to get closer to 2.5A but the driver could not do it.

That’s impressive :slight_smile:
Does the light handle the heat ok? Or is it only good on short bursts on high?

Cheers
Matt

Nice mod Hannes. I like your beamshot as well.

Sweet mod. But since there's been no response perhaps the OP melted together with the flashlight ? LOL

Sorry - just pulling your leg ;-)

Nice work Hannes

No shiat….it’d be a nice light for me.

Unfortunately your mod deals with SMT components. Out of my league. :frowning:

2 mins max max max for close to 5000 lumens OTF. Something like the DRY @ close to 5A with Sanyo 2600s @ 4.2V (lowest voltage sag, slightly better than NCR18650A). Not sure if the driver can take it in the long run as well. But you gotta sacrifice something for this.

If you want > 3000L OTF and yet can operate for quite long (at least 15 mins), you’d need the stock TF X100.

J18 is usd55 shipped on aliexpress…at least to my country. Tempting. I can’t find the resistor for nuts on my J12. Need to find the resistor, maybe can just piggyback and get a 3000 lumens light.

Thermal scan of the J12 (5 x XM-L) with 4000 lumens OTF with KD driver. It has thermal protection, so not sure how’s the output during the whole course.

Well done Hannes and thanx for posting!

Hannes modified one of our mutual friend’s Sky Ray 7xT6 with this mod as well. I couldn’t believe that the modified driver actually supplied 1.98A through the LEDs! This was the actual measurement through the LEDs. Tailcap amps was 4.8-4.9A with 2 x 26650’s.

The heat is handled surprising well. We compared the light with a Sky Ray 3800, Solarforce L2P and MPP-1 while keeping the 7xT6 on high. I’m guessing it was on high for 5mins and the flashlight was only slightly warm. We’ll to a temp test if anyone is interested.

Bro, is it 2 x 26650 (typo) or should it be 3 x 26650? It should be 3 x 26650 with ~ 5A at the tail. Then can you supply the LEDs with ~ 2A each, plus get 4800 lumens OTF.

Coz my TF X100 is already doing like 5.2 amps with 2 x 26650 TF Flames @ 4.2V. :smiley:
I used Kingkong 26650s and they are the same, all good cells.

My bad, yes it was 4.8-4.9A with 3 x 26650’s (12.1v) :frowning:

hannes,

How do you open to get to the circuit? I just got a TR-j18, and it does not turn on. I think the circuit it broken. I have to upgrade. I can not get it to open. I already screw the lens off. I have tried to put the LED assembly off, but it does not want to come off. I have tried to screw it off(scratch the paint off) , and it does not want to come off…. Can you help?

I got a J18 on Monday. Didn't turn on either - was the switch. Took apart, cleaned up what I could, the switch itself was flaky. Funny, because now I can't get it to fail! Gonna check the amps - running 3 TF 26650 5000's, and see if I can spot that resistor to replace - I could probably get 0.05 ohm one from work. This thing looks super bright before any mods - ceiling bounce was ~450 lux, brighter than the FandyFire King clone.

i can’t find that thing anywhere either… i’ll buy one from you if you can find one? :slight_smile:

Total Bust... My J18 driver is totally different from Hannes'. I got the type with a perpendicular board mounted to the backside of the 26mm board. Also I'm seeing higher amps with 3 TF 5000's - I'm tailcap measuring 4A, then quickly dropping to 3A - no idea what's going on with the drop though. I know my DMM setup has been rock solid with custom 12 gauge leads, heavily soldered into banana plugs. Don't have the know-how to find the current resistor, so was depending on Hannes post up top.

Picture of the J18 head and driver - bought from FastTech, Rcv'd 12/24/2012:

if you got it from fast tech… then i probably have the same one as yours… mine came from fast tech too :slight_smile:

Ohh, ok, both you guys (DayLighter and kingkong) have dim J18's. Been checking the other J18 threads...

DayLighter - I see you got an RMA from FastTech - so, still waiting for a replacement I guess? Sounds like it's been happening where 3 TF 5000's kill the driver... Wonder if there's a fix for that - maybe the driver I got is the new design? Hhhmmm...

kingkong - where/when did you get your J18? Hope my PM helped - interesting to see if your driver looks like mine.

according to WWEfans… he also have the same problem with 3 of his buyers… so they(Trustfires) send him new drivers.
he told me to ask fast tech for new driver … but why? they’re sending me a new replacement already without even waiting for the old one to arrive ( is that a awesome customer service or what?)
i guess this newer driver is buggy when using 3 26650s batteries. hopefully the replacement is not going to be a problem too.

did you try it with 3 26650s yet?