Liteflux LF2XT Discussion Thread (Part 5)

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So, first time posting on here after lurking for a while.

I bought a LF2XT from kuku a few weeks ago and started playing with it for a few days. Everything was fine until tonight. The light started becoming unresponsive, I thought it was the button that was giving out so I pressed harder. That worked for a while then things started to get freaky. In CUI mode I could not ramp up and down, I was able to change between min, reg, and max but while ramping it was blank. Sometimes 1c registered as 2c and it was basically unusable.

Now that I try it after not using it for a few hours it seems to work again. The button's responsive again and everything works.

Does anyone have any idea what's going on? Can it be that o ring issue between the lens and the pill?
 
Make sure the tail cap is tight. It can loosen & then it will do exactly what you are describing.

And by tail cap I mean the s/s looking end part where the clip is attached.

Even being loose about 1/8 of a turn can cause those symptoms in my experience.

Travis

So, first time posting on here after lurking for a while.

I bought a LF2XT from kuku a few weeks ago and started playing with it for a few days. Everything was fine until tonight. The light started becoming unresponsive, I thought it was the button that was giving out so I pressed harder. That worked for a while then things started to get freaky. In CUI mode I could not ramp up and down, I was able to change between min, reg, and max but while ramping it was blank. Sometimes 1c registered as 2c and it was basically unusable.

Now that I try it after not using it for a few hours it seems to work again. The button's responsive again and everything works.

Does anyone have any idea what's going on? Can it be that o ring issue between the lens and the pill?
 
Make sure the tail cap is tight. It can loosen & then it will do exactly what you are describing.

And by tail cap I mean the s/s looking end part where the clip is attached.

Even being loose about 1/8 of a turn can cause those symptoms in my experience.

Travis

OMG it works! It was off by 1 full turn :bow:
You sir, are awesome.
 
...yeah, sometimes either one of my LF2XTs will either not work or will flicker and/or turn off by itself. it only happens occasionally, and only after i have changed the battery or loosened and tightened something.

it just means that there's a bad connection, or no connection. just play around with loosening and tightening the head and tail. sometimes cleaning all the contacts can help. also, rotating the inner battery tube, or taking it out and putting it back in.
 
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Well for me it was the inside of my tailcap. The brass part around the spring. That made the button loose and i was actually able to press the button down beyond the point it's supposed to stop. Twisting the brass ring using my nail was enough to tighten it. Now it works pretty well :D

Perhaps your problem isn't with the whole cap itself but rather the inner brass ring?
 
Well for me it was the inside of my tailcap. The brass part around the spring. That made the button loose and i was actually able to press the button down beyond the point it's supposed to stop. Twisting the brass ring using my nail was enough to tighten it. Now it works pretty well :D

Perhaps your problem isn't with the whole cap itself but rather the inner brass ring?

When I read this I thought I better check the ring on mine. It was so loose it fell off when I opened it up. No wonder switching was acting flakey. Now all is better.

Thanks for the tip.

Geoff
 
I'm thinking about getting one of these from Khoo in the marketplace... as soon as a moderator unlocks me from total newbie status *hint*.

Hope this loose ring business isn't a deal-breaker. I'd probably use a bit of Loctite to keep things in place, but I don't know if that's a smart thing to do until I have one in my hands.
 
Decided to take apart the switch again and make sure everything was clean. When it was open I very gently gave the switch button spring a stretch. Could be my imagination, but it seems to now feel better, maybe because of slightly longer button travel.

Geoff
 
Goeff, I did the same thing, positive results. I think the resistance of the O-ring makes the action mushy.
 
imo if there's one weak point in the LF2XT it's the switch. it could be much more rugged and reliable.
 
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See how you like it with the button spring removed.... (crisp action)

Decided to take apart the switch again and make sure everything was clean. When it was open I very gently gave the switch button spring a stretch. Could be my imagination, but it seems to now feel better, maybe because of slightly longer button travel.

Geoff
 
.
See how you like it with the button spring removed.... (crisp action)
I have two of em', bought a few months apart. I tweaked the switch on first one almost immediately by just removing the spring. Thought it felt great and worked good then. Left it like that for months. I've since tweaked it some more.

The second one I received felt different, but couldn't really tell why. I removed the spring on it, but it just didn't have the same feel as the first one. One thing different was that this one had more travel. Took it back apart and added two layers of a small piece of scotch tape to the nub on the underside of the sw button. That took up all but a very little bit of free play and improved the feel. I ended up putting the spring back in and I believe I stretched it some before doing so. I tried so many different combinations between the two of em I lost track.

There was also a difference in the drag on the sw button o-ring between the two of em. All the variables combined gave them different feels.

Each sample may require something different in the mod to get it to feel... right.

Bottom line is I've got them worked out and they both feel good now.

They rotate EDC duty as I always have one of them on me at all times so I need to have the switch feel & work positively.

I run 10440s in em' and it's my favorite light!

capturelf2xt.jpg

Please excuse to poor quality quick pic as I was in a hurry and thought this thread needed a fresh pic. ;)
 
I did three things to my switch that made a vast improvement and not one single glitch in what must be thousands of cycles.

..maybe 10's of thousands??? :thinking:
That dammed thing is very addictive/fun. :D

Oh, and best user interface EVER!


First, I cut the slots in the brass ring deeper so that I could get a good bite on it when I tightened/loosened it up.
It was loose from the factory and the first thing I do to all of my lights is take them completely apart for examination and fine tuning. :devil:

Second, found a replacement spring that was slightly heavier to prevent accidental activation.

Third, I carefully applied Krytox to the O-ring and O-ring groove.
The factory assembled mine DRY, sans lube!
This final touch made that switch slicker than snot on a glass door knob, let me tell ya.

Krytox is hands down the absolute finest lubricant you can apply to O-rings.
I know it's higher than a cat's back but a little goes a very long way.
I've had the same two tubs for at least 10 years and I'll be dead and buried before I can use this stuff up.



Great light btw, made even better by Ku's Ti spa treatment. :devil:
 
I have a akoray k106 with a dead led, how bright is the lf2xt xpg r5 compared to the k106?
 
I have another question which has better light transmission ar glass or sapphire?
 
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