Fenix TK61vn (XM-L2, 4x18650/8xCR123A) Dedome Modded Review: BEAMSHOTS, RUNTIME+

selfbuilt

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I wonder, how would this particular Fenix light and batteries in it withstand serious fall?
Maybe Selfbuilt or Vinh would like to experiment.
I expect it would hold up well, given how sturdy the carrier is. I would consider the risk of protected cell failure due to impact to be exceeding low (compared to the common risk associated with potential over-discharged or mismatch-charged unprotected cells in multi-cell lights).
 

Vlk

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I expect it would hold up well, given how sturdy the carrier is. I would consider the risk of protected cell failure due to impact to be exceeding low (compared to the common risk associated with potential over-discharged or mismatch-charged unprotected cells in multi-cell lights).

I see. You advocate using protected cells in any multi-cell light because it is the safest approach.
But somehow in the case of this particular light you did not convince me. I would use trusty Panasonic NCR18650A without hesitation.
Thank you for the participation in the discussion.
 

Vlk

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A little off the subject. I always thought that it is the job of the device to protect the user, itself and the batteries that power it. Personally, I would not use a flashlight that requires I use protected batteries.
I think, they use 2000 or so Panasonic batteries in Tesla electric car, maybe custom, I don't know.
 

selfbuilt

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A little off the subject. I always thought that it is the job of the device to protect the user, itself and the batteries that power it. Personally, I would not use a flashlight that requires I use protected batteries.
I think, they use 2000 or so Panasonic batteries in Tesla electric car, maybe custom, I don't know.
Battery packs have a circuit that regulate charging and monitor performance, hence why individually-protected cells are not required inside the pack. The device can only do so much to protect you if you are using your own cells, which gets back to why user-replaceable cells should ideally have their own protection circuits whenever possible. The main risk with Li-ions comes not in use, but during charging (i.e., a sustained discharge beyond the normal low-voltage cut-off level of protected cells will physically damage Li-ions, meaning they should never be placed back on a charger).

This is definitely off-topic now, so I would request any further discussion take place in the batteries forum.
 

selfbuilt

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Do you plan to upgrade it for New V2,version???
No, I think I'll stick with the original driver/interface. The new V2 should only have a modest increase in output (and thus throw).

I am working on a couple of other lights from Vinh though ... stay tuned.
 

RemcoM

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Hi Selfbuilt,

Is the light comming out of my Stock Fenix TK61 blindingly bright for other people, at close, to moderate distance away from the light?

When they staring into it?

At low 6700 cd, at medium, 29000 cd, at high 70000 cd, and what about the blinding risk, at turbo, at 170000 cd?

Can the TK61 be annoyingly bright for other people?
 

selfbuilt

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Can the TK61 be annoyingly bright for other people?
Yes, I would say so. Any throwy light is going to be blinding if stared directly into. You would want to shine away from them (i.e., illuminated only in the spill, not the hotspot). A diffuser cover is useful for any light, if you want to avoid blinding people.
 

netvlada

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Selfbuilt

How you can compare TK61vn vs DEFT-X.I mean thet Dext-x have zero spill and you can not see nothing around you and in near front.For example if you are on open road at max throw can you see road around you where to walk.
 

TEEJ

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Selfbuilt

How you can compare TK61vn vs DEFT-X.I mean thet Dext-x have zero spill and you can not see nothing around you and in near front.For example if you are on open road at max throw can you see road around you where to walk.

You are comparing a reflector based beam to a wavien light collar aspherical beam...and they are completely different.

A search light is used to see things a long way off, and is not designed to light a path right in front of you....as there would be a very bright hot spot that kills your night vision and hinders proximal peripheral vision.

Having a DeftX, I can say that the best way to describe the beam is to imagine you were holding a slide projector, and, aiming a picture of the LED on distant targets to light them up.

For the reflector based light, the beam is more conventional, in that there is some spill, a corona and a hot spot...but, Vinh's thrower is also going to not be the best tool for the job if path lighting is the objective.

Both lights have a VERY concentrated central beam....and turning it to a lower mode just gives a teeny spot of concentrated light....so seeing what's out there with either is very much like looking through a paper towel tube sort of view.

For path lighting, a second light with a floody beam works MUCH better.
 

netvlada

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Yes,correct.
Because of thet ,there is Deft-Rev.
If you consider price vs spec which is better option,Tk61vn or Deft-X.
My dream is to have two Deft-x heads and just to swap it for throw or floody beam[emoji3]
 
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TEEJ

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Yes,correct.
Because of thet ,there is Deft-Rev.
If you consider price vs spec which is better option,Tk61vn or Deft-X.
My dream is to have two Deft-x heads and just to swap it for throw or floody beam[emoji3]

It depends on your use.

The DeftX out throws the TK61vn...so if say ultimate range was your primary criteria, the DeftX wins. If range per dollar was the contest, the TK61vn wins.

If we round the throws that each might give you, you are talking about ~ 740 k cd vs 1.1 million cd

That looks like a lot, so, in the field, say using range to 1 lux, its ~ 860 meters vs ~ 1,049 meters.

If using as a search/disaster response light, say to search for survivors, etc, and you use 15 lux, its more like ~ 271 meters vs ~ 222 meters.

That CAN make a difference between resolving a leg from a branch at that kind or range in a search, and if you're the victim being looked FOR, YOU'D like the searcher to have the brighter light if you're ~ 250 meters away and bleeding out.

If I am equipping guys for a search though, and I can get THREE 740 k cd lights, or ONE 1.1 M cd light, I would feel that the three 740's could search a larger area more quickly overall, etc.

If I have to patrol a 500 meter wide river or flood zone, etc, and am cruising down the middle to search both banks at the same time, I'd better have the DeftX (Or other search light with that magnitude cd) to be able to hit both banks with 15+ lux from the same point.

So, sometimes the task dictates the best tool for it.

:D
 

mks195

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Thank you SelfBuilt for all you do for the flashlight hobbyist > enthusiast > "flashaholic" community! Just sent a modest donation to your battery fund.
Please continue your Great Work! :twothumbs
 
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RemcoM

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Hi Selfbuilt,

Can the TK61vn, reach visibly, or clearly a treeline, at 1000 meters-1 kilometre,

i want order this light also, so i want know.

Thank you.
 

selfbuilt

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Can the TK61vn, reach visibly, or clearly a treeline, at 1000 meters-1 kilometre,
There is a new version of this light offered by Vinh now, with greater throw. It should indeed reach 1 km, but not sure how "visibly" or "clearly" that would be to the naked eye.
 

KeepingItLight

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:welcome: Hi, Peter!

Vinh has his own forum at CPF. You will find it here. You might try posting a message there. Better still, why not send him a private message (PM)? His user name is Vinhnguyen54.

Another place to purchase his flashlights is his new web site: skylumen.com

Hope this helps.
 

Alex1234

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:welcome: Hi, Peter!

Vinh has his own forum at CPF. You will find it here. You might try posting a message there. Better still, why not send him a private message (PM)? His user name is Vinhnguyen54.

Another place to purchase his flashlights is his new web site: skylumen.com

Hope this helps.


Vinh disabled his PM feature on this forum. He wants all questions and orders emailed to him at [email protected]
 
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