Giving a spring bypass a first try. I was going to put the wire inside the spring, but this effort proved to be impossible. The guys who can do that are Magicians. 
The patient is a MT09R that Iām trying to squeeze a few more lumens from. 
This light gets super hot very fast.
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Before new springs, it was already bypassed but it was unclear the size wire, it looked to be 20 gauge.
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The driver spring looked to be 22 gauge, not certain. 
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The two bypass wires in the battery tube were actually 18 gauge so no change needed there. 
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Cut the springs shorter to match factory length. 
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Tailcap after new Beryllium copper springs and 18 gauge bypass. 
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The plastic insulators were removed to allow using flat top batteries. 
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The driver with a new Gold plated Beryllium copper spring and 18 gauge bypass. 
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After all this we gained an additional 3 amps to 25 amps and total 14,290 lumens. And yes thatās a bit low lumen reading and now Iām questioning the lumen tube accuracy for high lumen lights. It is calibrated with ā maukka ā lights. So any help or advice is welcome. 
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CNCman, a word of caution about spring bypasses. Be sure to position and size any (+) contact wire such that in the event of a failed solder joint/wire end, that you donāt short internally against (-) components. In your case, the most dangerous one is the driver wire. I would also consider rotating your battery contact board wires 180 degrees
the wire you used has very few strands so it will break relative quick
always use super flexible wire that has hundreds of strands per mmĀ²
here 2 times 0.5mmĀ² one is standard wire the other high flexible silicone
I was happy today!
I received some drivers from Lexel, I would finally be able to do something to break the quarantine boredom.
And so I did.
I picked my Bliztwolf BW-ET1 (e-switch, 1 or 2 AA cells) that i wanted to mode for a while. It was a light I reviewed a while ago, I took the driver out and never used it again.
I wanted to mod it to use 2 x 14500 Li-Ion cells and Anduril firmware.
So, today I received the 2S 15mm driver and took my chance.
I forgot to ask Lexel to add the switch wires, and had to add them. Small pads, but no issues.
Then I needed to do one of the trickiest parts for me, something like āpiggybackingā the light, using the original driver ācontact boardā, that has a specific size and shape.
I had to remove the spring from the driver (I also forgot to ask to not include it 
) and put the + wire back in place.
I also had soldered 2 wires onto it the original board, that would be soldered then to the driver.
After this I add to solder the e-switch and I tested the XHP50.2 (soldered onto a aluminum PCB that was from an old XML2 led ) I got from a BLF member some weeks ago.
Even without soldering it, it was working , so I consolidated the work.
To avoid contacts/shorts between the reflector and the wiresā solder, I added some tape on the back of it.
With everything mounted, I turned the light ON andā¦it only worked well for some seconds :zipper_mouth_face:
After powering it in Turbo, the light started to turn blue.
I immediately shut it OFF and looked to the ledā¦ It turned it ON again and it only aggravated the situation 
So, what did I do wrong here? 
Bad led reflowing?
Too thin PCB?
Other?
Any help concerning this is helpfulā¦ Thanks in advance!
I have other mods planned with this type of Led and 2S 15mm drivers (14500 Li-Ion), so I am now thinking to order other XHP50.2 from Simon eventually.
no DTP MCPCB most likely if it was a 6V LED
I should have used the sinkpads, right? :zipper_mouth_face:
They are small so I would have problems centering them. But I learned my lesson!
Thanks for the reply! And for the drivers too 
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Thanks, I did not notice that. :+1:
This is the only light I own with bypassed springs. I am going to remove them this weekend because the light simply gets too hot and actually shut off after running on high for 30 seconds and then on turbo for 30 seconds. Not what I was expecting to see from this light. I measured 25 amps with 30Qās and it gets very hot very fast on turbo, almost useless. I had given thought to water cooling it but itās too small for that.
Red Convoy S2+ with triple sst20 FD2 on 20mm Noctigon soldered on triple pill from Kiril. FET+6+1 with bistroHD and custom modegroups, Carclo 10511, fireball red turboglow, dual BeCU springs at the tail.
Itās heavy.
Installed an sw45k into a V10r Ti+ that originally had an XM-L2
Maximum is 280 Lumens, after 5 minutes it is still producing 230 lumens on a 16340. The lowest mode is 0.04 lumens, which for me, as a firefly lover, is a very nice sublumen option, considerably lower than the spec of 1 lumen minimum for these lights.
Considering the centering challenge, since the centering ring is for a larger LED, and the reflector has a large opening in the bottom, I find the beam very satisfying, and better than the original. The hotspot is tighter, and of course the tint and CRI are vastly superior to the original.
Great mod, jon_slider. What a beautiful little light, now with beautiful tint/CRI to go with it.
@gchart, thank you for taking the time to comment, I very much appreciate the kind words
The V10r lights are truly a joy to use, I am very fond of the design and operation of the magnetic control rings.
They are also slightly easier to work on than the RRT-01, and I have come to enjoy the tailswitch option of the Sunwayman, which lets me turn the light on and off at the same level as last used, which can be a convenient form of memory.
Oh man, nice looking light jon_slider with your favorite high cri rosy led. 
That xml reflector does take a little bit to get centered, but it does work amazingly well with the smaller led.
Your going to be a sunwayman before you know it. 
You are so true
definitely an equal opportunity Magnetic Rotary Man
I like that the Sunwayman V10 and V11 models lego too
The sw45k is much easier to get a good hotspot without donut hole
the E21a sits lower, and benefits from being raised 0.5mm
the bad donut on the E21 light on the far right, is because the LED was not raised, and needs to be redone
while the E21a light second from left IS raised and turned out really well
(both were originally xpg models, with smaller reflector holes than the xm-l2 models (Ti+ and V11r)
So jealous, wish I could find one too. 
I replaced the Samsung LH351D 4000K in my silver S2+ since I didnāt like the tint. I put in triple Samsung LH351D 5000K (SPHWHTL3DA0GF4RTS6) LEDs that I got from Digi-Key. I shaved them to improve the throw and to hopefully lower the CCT a bit. I like the tint of the new LEDs much better. They appear almost pure white with a very slight touch of magenta. BTW, the green lighted tailcap uses only 0.03 milliamps so theoretically should last 10+ years on the Samsung 35E battery.
congrats, those are nice white LEDs, to me slightly pink compared to daylight.
I use my shaved 5000k LH351d often (shout out to contactcr for the hookup). Good tint for a tasklight, during the day imoā¦
Thanks jon_slider. The tint looks very good, but Iām still not sure if I like it better than my triple shaved 219B sw45k. But if I had to pick, I guess I would go with the Nichia. But then again, the Samsungs are so much brighter! Choices, choicesā¦
We are fortunate that we can enjoy Bothā¦
im polyamorous, but most faithful to sw45k, after dark
the LH351d is more of a daytime dalliance
Today I modded a Sunwayman V10a, to sw45k, using the stock aluminium mcpcb.
It took half a dozen attempts with vise grips and leather wrap, to get the control ring assembly unscrewed.
I kept thinking about giving up, but instead kept putting the light in the sun to warm up again.
Eventually, the glue yielded to firm persuasion, without damage to the light, nor my pride.
The centering is as close to perfect as I have come so far.
The beam is excellent, with almost no dark cross even within very close range. On a white wall I can still find fault with the beam transition from hotspot to spill, but unless Im trying to, I do not notice the artifacts in actual use.
I now have two modded V10a, one w sw45k and the other w 4500k E21a.
fwiw, They have essentially the same output. Using the same battery to compare, the E21a is less than 5% brighter. The sw45k is a much easier mod than the E21a, in terms of centering and beam quality, because the sw45k allows reuse of the stock 12.7mm mcpcb and centering ring, which fit the sw45k very well.
