Question about TR-J20 modding

[R10500]

@DB Custom

You can see the white epoxy potting my little 17mm FET driver to the big contact board, on the left in the second and third pictures. I figured with this big heavy light it’s inevitable that it falls or gets dropped so I potted it for durability.

Since I am using 3 cells I wanted to match the emitter voltage. Pushing the 9V MT-G2 pretty hard it has about a 11.3V forward voltage so it takes the 3 cell configuration nicely. I’m doing the same in a BTU Shocker as well, with 3 of the same emitter and using 18650’s in the beefed up carrier.

You could run 4 6V emitters, 2S2P and they should do fine. There’s all sorts of ways to configure a light this size of course. Richard replaced the XM-L’s with XHP-50’s and I made him an extension tube for a 4th cell along with the big heat sink. He got 39,000 lumens and it would run with the sink to kill cells. Initially, without the sink, it was too hot in about 30 seconds. So yeah, there’s all sorts of things you can do with this huge beefy light.

Is there a right way to potting the driver? I mean, could one ruin anything when potting?

If i ran 4 emitters 2S2P with 3 batteries, wouldn’t they have a forward voltage that when combined per string exceeds what the batteries can put out, say at 5A per emitter? What would happen in that case, would more amps simply be drawn out of the batteries, and even more as the batteries are exhausted?

39,000 lumens! How come i haven’t seen any photos of that on BLF yet haha how many amps does Richard’s draw at that output? I imagine his would have been modded with an e-switch?

The extra weight’s not so bad, not when you come to think of it as a light cannon, it all just makes perfect sense! I know i’d love something like that

[R10500]

@automattic

Definitely Some works of art being made out of the TR-J20! I’ve made it into my new project light. Started upgrading the mosfets but I botched my first board by lifting a pad. Got a replacement driver from Trustfire and it looks like the new ones have 6 mosfets instead of 5. With one of them being stacked. Replaced all 6 of the Mosfets with IRLR8726TRLPBF from MTN electronics. Did the resistor mod and it already seems brighter than before.

Trying to get as much power as I can get out of the stock driver and running 12 XHP50.2 I’m looking for some good output while still keeping it efficient.

Does the new driver show any sign of increased potential?

[R10500]

@texas shooter

I think the TR-J20 was the pinnacle of the multi emitter budget lights. Nothing since has matched the quality, heat sinking, output that modders loved. With a price that said “rip me up and rebuild me.” It’s real limit was 3 batteries, even 32650’s couldn’t put 12 emitters into the overkill zone.

Maybe someone on BLF will be custom making a J20 BLF edition, just like that BLF thrower…. which reminds me, any sign of it finally being produced?

[automattic]

It seems to have more potential. I never tested it with the stock mosfets on the replacement though. Need to do some tailcap and temperature tests. I’m thinking that with the low resistance of the 12 xhp50.2 it should output some more amps as well…

Thought about double stacking all the mosfets as well, we will see how ambitious I get

[texas_shooter]

@automattic

It seems to have more potential. I never tested it with the stock mosfets on the replacement though. Need to do some tailcap and temperature tests. I’m thinking that with the low resistance of the 12 xhp50.2 it should output some more amps as well…

Thought about double stacking all the mosfets as well, we will see how ambitious I get

I see the potential. The head and reflectors are good to go with very little work. I thought that the heads would make good off road lights years before the XHP LED’s.

[R10500]

The resistors i bought have arrived, but i’m only realizing now that they’re smaller than those on the driver. These ones are 470R, 1206J 5% resistors. Did i get the wrong ones?