In celebration of the TK40.

[madmook]

what kind of AA/s? If NiMH, I think it would be 9-10 hours.

Fenix specs are: Turbo (630 Lumens, 2Hrs) ->Low (13 Lumens, 150Hrs) ->Mid (93 Lumens, 20Hrs)->High (277 Lumens, 6.8Hrs)

Fenix says 6.8 hours on high with what I'm assuming are 8 high capacity nimh's. Has anyone done a runtime test on that mode? I guess it should be safe to assume that using 4 cells would just halve the runtime.

Anyway, I'm asking because in my experience with a LD10 Fenix exaggerates their reported runtimes somewhat.

Edit: n/m, found some runtime numbers on http://www.light-reviews.com/fenix_tk40/ ... about 5 and a half hours on high with 8x eneloops.

 

[headophile]

I don't own a TK40, I do however own a MCE Modded KL6...2.5 hours on the M6 body:twothumbs

more than my needs for throw, mostly I rely on the MCE modded L4s, 17670s are by cup of tea:thumbsup:

that's cool. i see a 6p original (q3 5a/3a mod) and hopefully an m6 (whatever best mod at the time) as well in my future

 

[biggerdog]

what exactly is the brand of said eneloop knockoffs? are they close to the performance of the real thing? i've read of rebranded ones like the duraloops. are they the same thing? just one question about batteries 🙂

They are Duracell HR6/DX1500, 2000mah. No white at the top so I don't think they're rebadged Eneloops. I got 24 of these by mistake recently, but decided to keep them since they're LSD. Once I got the TK40, it seemed logical to put them in while I learned about the flashlight and how well it treat its cells under various operating conditions. If they behave, that's fine, and if not, I do have new Eneloops waiting to be pressed into service.

 

[biggerdog]

You might ask aussiebob. :naughty: http://www.candlepowerforums.com/vb/showthread.php?t=233856

LOL! I hadn't seen that thread. I've been treating my TK40 like it's made of glass.

 

[headophile]

LOL! I hadn't seen that thread. I've been treating my TK40 like it's made of glass.

i've seen that thread and i still baby my tk40 anyway. for now at least :laughing:

 

[Chrontius]

there is no brightness setting that goes for 11...

But there is one that goes to 11. 😀

 

[jahxman]

It drives me nuts that Fenix won't redesign the light to accomadate L91 batteries

Well, I bought the light before anyone said anything about not running L91s in it, and I've run a few sets of L91s though it. Yes, I did have a hot battery situation - when I had apparently loaded one of the eight backwards :duh2: but since then no problem.

I would guess the recommendation against the L91s is that thermal runaway with a lithium primary is worse than thermal runaway with a NiMH or Alkaline - there exists a greater fire hazard. Fortunately in my case I noticed the heat before it became dangerous.

I continued to use L91s, however, with no problems - Currently I have eneloops loaded but I'm keeping a new 8 pack of L91s ready for potential extended power outage use, after all the NiMHs are depleted. I'll only need to replace it after about 10 years, at which time who knows what our portable lighting options will look like!

 

[Saint_Dogbert]

Fenix specs are: Turbo (630 Lumens, 2Hrs) ->Low (13 Lumens, 150Hrs) ->Mid (93 Lumens, 20Hrs)->High (277 Lumens, 6.8Hrs)

Fenix says 6.8 hours on high with what I'm assuming are 8 high capacity nimh's. Has anyone done a runtime test on that mode? I guess it should be safe to assume that using 4 cells would just halve the runtime.

Anyway, I'm asking because in my experience with a LD10 Fenix exaggerates their reported runtimes somewhat.

Edit: n/m, found some runtime numbers on http://www.light-reviews.com/fenix_tk40/ ... about 5 and a half hours on high with 8x eneloops.

whoopsy-daisy. I thought the question was about medium for some reason. Light-reviews tested turbo on 8xeneloops to 1hr50min fwiw, so Fenix probably does exaggerate at least the higher output runtimes a little bit.

 

[droeun]

TK40 manual says to unscrew the tail cap when not in use for a few days. Does anyone know how much impact this drain has?

 

[jirik_cz]

Anybody know the runtime on high (the 277 lumen spec) when running off 4xAA? Thanks in advance.

Just check my czech TK40 review. Plenty of runtimes with various battery configurations.

It drives me nuts that Fenix won't redesign the light to accomadate L91 batteries

The driver can take L91 batteries. There is nothing wrong with the design of the light. Just don't put the batteries in the wrong direction.

so Fenix probably does exaggerate at least the higher output runtimes a little bit.

Eneloops have just 2000mAh capacity, Fenix usually states that they use 2500mAh cells for measuring runtime. You can easilly get more than 2 hours turbo runtime with higher capacity batteries.

 

[HKJ]

TK40 manual says to unscrew the tail cap when not in use for a few days. Does anyone know how much impact this drain has?

It will drain the batteries in about a year. You can see the drain for some more lights here.

 

[madmook]

Just check my czech TK40 review. Plenty of runtimes with various battery configurations.

Can't read the Czech, but I sure can appreciate those beautiful graphs and photos!!! Thanks so much for the link, great data, you were also very helpful in the iTP A6 Polestar thread. :thumbsup: Almost 3.5 hours on high with 4x high-capacity nimhs, so that means about 2.5+ hours with 4x eneloop capacity.

The reason I'm so interested in running 4 cells is because I have numerous 4x sets of different-branded nimh's, it'll make it lighter to carry, and it'll cut down on battery-changing time. So awesome that all the modes are available on just 4 cells with the only expense being runtime.

I already ordered a brand new TK40 yesterday, and I can't wait for it to arrive. Most eager to see the difference in the TK40's med and high modes vs. my iTP A6 Polestar's med mode.

 

[Illum]

that's cool. i see a 6p original (q3 5a/3a mod) and hopefully an m6 (whatever best mod at the time) as well in my future

whatever mods you decide to create, keep it in that form, changing mods continuously will leave you with a bunch of used parts that are collectively counterproductive sitting around🙂

 

[headophile]

whatever mods you decide to create, keep it in that form, changing mods continuously will leave you with a bunch of used parts that are collectively counterproductive sitting around🙂

or i could use those parts to justify building other lights :devil:

thanks for the tip 🙂

on topic:

got a chance to shine my tk40 last night in an almost pitch black area with trees and plants. the output gave me a pleasingly wide field of view while being able to make out fine details from a good distance away. perfect compromise between flood and throw. there's no dark outdoor scenario you can't conquer with this coupled with a really good thrower.

i'm really loving this light and it has exceeded all my expectations so far. i have interest in all kinds of lights but i have no doubt that my aa-powered led units will be the most useful and dependable ones in times of real need :thumbsup:

 

[flasherByNight]

it's a shame that 4sevens has had such a bad experience with carrying it, it is a truly unique light

 

[LittleBill]

it's a shame that 4sevens has had such a bad experience with carrying it, it is a truly unique light

and what blows my mind is how simple it is to load battery's. Not to mention novice's for the most part won't be buying this light. i would expect a higher then average user buying this light. so i would expect very few issues. like said before i love the aa configuration. and again the beam is perfect

 

[apontes]

I believe there are 2 version of the carrier, the later version has a slightly better design imo. mine has a flat negative contact plate (instead of bare spring) and provides better hold for the batteries.

I liked the first version better. Actually, I think I had version 1.5 in my first one, since there were bare springs and the holding tabs. The flat negative contacts on my second one tend to go off-center relative to the springs, so I have to push them back in order to insert the carrier.

My TK40 still has one of the best beams and tints of all my lights.

Indeed. Fenix hit a homerun. Among my quads, it has the most uniform center spot.




Two other things I really like: it's well balanced, not head-heavy and it's UI is one of the best out there for multilevels, keeping the disco modes out of the way but also easily accessible. The levels are all useful and very well spaced too.

True, I'd rather do without a battery carrier, but it doesn't bug me too much.

Compared to the EagleTacs M2xxx, it's build quality is waaaay better. Feels distinctively more solid.

My best light. By far.

 

[headophile]

Eneloops have just 2000mAh capacity, Fenix usually states that they use 2500mAh cells for measuring runtime. You can easilly get more than 2 hours turbo runtime with higher capacity batteries.

that's good to know. i haven't had a chance to do my own real testing of runtime so far.

 

[DanhNguyenster64]

I just recieved my flashlight and it doesnt seem very bright? Doesnt appear to be 630 Lumens... Only seems twice as bright as my tk10 with CR123's I've had in there for 5-6 months now... Maybe it's just me? Also, Ive been trying to find a picattiny rail mount to mount this baby on my armalite ar15 carbine style with no luck... Help please?

Thank You

DanhNguyenser64

 

[Felco]

I have 2 of these, one as a backup.