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Thread: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

  1. #1

    Talking LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Reviewer's Note: The black LF2XT was provided for review by CPF dealer LED Cool. Please see his Dealer's thread in CPFM for more info.

    Warning: Pic heavy!

    Manufacturer's specifications, as taken from LED Cool's CPFMP thread:
    • LED : CREE XP-E Q4 Neutral White tint (limited run R2 Cool White tint available soon)
    • Input voltage : 0.9V - 4.50V (AAA/10440)
    • AAA battery chemistry : Alkaline(1.5V), NIMH(1.2V), NICD(1.2), Primary Lithium(1.7V) & rechargeable Li-Ion 10440(4.2V)
    • Uses PWM at high frequency. No flickering at min output.
    • Removeable Orange peel aluminium reflector.
    • Centered LED.
    • Coated glass lens.
    • Finish : HA III BLACK or NATURAL.
    • Single o ring seal at lens, battery tube and tail cap.
    • Stainless steel tail cap with laser engraving.
    • Stable tail stand when stainless steel clip or keyring is installed.
    • All parts can be dismantle for cleaning and maintenance.
    • Water resistant for daily normal use. NOT suitable for diving or swimming.
    • Size: Length 81mm, Diameter 14.55mm (bezel)
    • Standard accessories: Wooden gift box, stainless steel clip, stainless steel keyring attachment, spare O rings, A small container of silicon lubricant for the o-rings, Chinese and English operation manual.
    • 2-in-1 EDC light because it has 2 User Interfaces. Compact User Interface (CUI), which is the factory default UI, and Full-function User Interface (FUI).
      CUI is those who prefer a simple straight forward UI, while FUI is for those who prefer to set up thier EDC light exactly the way they prefer.
    • Both UI provides battery over discharge protection. please refer to the user manual for more info.



    The LF2XT is the newest member of the clicky-based LiteFlux family, bringing a revised version of their innovative circuit to the 1xAAA form factor. Building on their 1xCR123A/RCR model, the LF3XT, the LF2XT again features two separate user interfaces that you can switch between at will.

    The Compact User interface (CUI) is very similar to the Nitecore D10/EX10, and the Full User Interface (FUI) allows full programmable control over the light (similar to Novatac or Ra lights). The CUI is a model of simplicity, and very easy to use right out of the box.



    The LiteFlux packaging is similar among all models, and comes with a nice wooden presentation box. Light comes with a pocket clip installed, and package contains a manual, replacement keychain clip and split-ring, spare o-rings, and lube.



    (from left to right: 1xAAA Duracell, LF2XT Natural, Lumapower Avenger GX, Fenix L0D, JetBeam Jet-µ, Nitecore EZAA, LF2XT Black)

    Both the Natural finish and Black finish lights are shown above (I installed keychain clip in the Natural finish light). I personally like the medium-gray colour of the Natural finish, as it should make anodizing nicks and damage after prolonged keychain carry less noticeable. There is a slight mismatch in the natural finish between the head and body, but this is common on all natural finish lights (due to different batches of anodizing).






    Despite the clicky switch and interior battery tube, size and weight remain fairly low.

    Weight: 21.1g (Nat), 21.3g (black) with pocket clip installed (-0.5g if keychain ring clip installed)
    Length x Width: 81.2mm x 14.9mm (bezel widest portion)



    Clicky feel is similar to the other LiteFlux LFxXT series. Unlike a traditional clicky switch with a long traverse, these are more like the electronic switches that you will find on a number of modern devices (e.g. LCD monitors, DVD players, etc.). Only a light touch is required to activate the switch.

    Fit and finish are excellent on my samples (sorry for the dusty and grainy pics above - it was an overcast day). The minimal lettering on the stainless steel tailcap is very clear and sharp, and the type-III hard anodizing is flawless on both samples. I like the fact that labels are kept to a minimum.

    What little knurling that is present is pretty mild, but the concentric ridges and raised portions all along the length help considerably with grip. I find the installed pocket clip to be a bit on the thin side, but given the low weight of the light should work fine. Good that you can easily switch it for the keychain clip, which is my preferred carry for 1xAAA lights.

    Screw threads are anodized for head lock-out, and the light can tailstand.



    The light uses the new smaller Cree Q5 XP-E emitter, currently with a Q4 output bin and "neutral tint" bin of 4C. For those of you not familiar with tints, standard white LEDs are considered to be "cool tint", and what most people call warm tints are in fact "neutral" or "neutral-warm". For more information on tints and color perception, please see my Colour tint comparison and the summary LED tint charts found here.

    My first impression when I turned on the LF2XT was "Wow, that's a nice tint." I am not personally a fan of the common neutral-warm Cree tints such as 5A (I find them a bit too orange in actual use). In contrast, the 4C is a lot more yellow than orange, and closer to incandescent in my eyes. Note that a limited run on LF2XT with cool white R2 emitters is also in the works (WH tint, which is toward the warmer green/yellow range of cool white tints).

    XP-E emitters with textured reflectors typically have fairly smooth beams with minimal Cree rings, and the LF2XT is no exception. The reflectors have at least a medium level of orange peel texturing.

    Comparison Beamshots

    All lights are on 100% on Sanyo Eneloop (NiMH), about 0.5 meters from a white wall.





    The camera is accentuating the tint difference a bit, but the Fenix L0D (older Cree P4 model) does indeed have a slight bluish Cool White tint. The Lumapower Avenger GX is on the warm end of Cool White (maybe a WG-WH tint). The LF2XT is not as orange as the pic above suggests – a lot more yellow (4C neutral tint).

    The LF2XT beam is very smooth, with an even transition from hotspot to spill.

    User Interface

    Like its big brother the LF3XT, the LF2XT is a remarkably versatile light with two user-selectable interfaces that should please KISS-fans as well those wanting a fully user-customizable light.

    In Compact User Interface (CUI), the light is remarkably similar to the Nitecore D10/EX10 - but with a few differences. With the head fully tightened, click for on/off. When on, press and hold to begin the ramp, release to select the desired level. Shortcuts to Min (double-click) and Max (click-press/hold) are included.

    The main complaint with the D10/EX10 interface is that your custom-set level is erased when you use the shortcuts (i.e. jump to Min, and Min is now your new custom-set level). In contrast, the LF2XT/LF3XT retains the user-selected output even when shortcuts are used. The shortcuts are actually a toggle - e.g. double-click for Min, double-click again or turn off/on and you are back to your pre-selected user level. This is actually very useful for those that like to keep a user-defined level.

    Note however that the LiteFlux is different in that it always retains the memory of the user-defined level, even if the light is turned off after a shortcut has been used. (i.e. it also reverts back to user-defined level when turned back on) See my post #23 for a greater discussion of how this differs in practice from the NiteCore lights.

    You can also re-program your LF2XT/LF3XT to act as a momentary-on instead of click-on (like you can do on the EX10 by unscrewing the head slightly), but I find this less useful for keychain carry.

    The Full-function User Interface (FUI) is much more complex, and similar to the older LF5XT. Again, although the light is easy to use in practice once programmed, I you will need to refer to the manual when you want to re-program any features. Please refer to LED Cool's dealer thread on CPFMP or the LF2XT discussion thread here on CPF for more info on how to use it (there's also a programming flowchart available, for those more visually-inclined).

    Low Voltage Cut-off

    One key feature that can be toggled on/off from either UI is the low voltage over-discharge protection system (4 clicks + press-and-hold from the On state toggles it on/off in either UI mode). This cut-off protection applies to all battery types on the LF2XT, so you will only want to have it on for Li-ion (10440) and NiMH (2.8V and 0.8V cut-off, respectively).

    This is an incredibly useful feature, since protected Li-ion is not possible in the 1xAAA size (and over-draining Li-ion even once could destroy the cell, and risk serious damage if attempted to re-charge). It's also very useful on NiMH - although many don't realize it, allowing your NiMH cells to drain to zero and stay there for any length of time is also damaging for the cells.

    UPDATE July 6, 2009: I forgot to mention it, but the over-discharge protection (ODP) feature also has another characteristic - it gives you a few warning flashes before the battery cuts-out. On my Natural LF2XT (i.e. LF2XT #1 in the runtimes below), the light started flashing intermittently within a couple of minutes before cutting out. These flashes are fairly slow, but increase in frequency just before shut down. However, since they only start in the last couple of mins, they weren't picked up in any of the runtime traces (where output is sampled at 30 sec intervals). My Black LF2XT seems to start showing the flashing a minute or two earlier, so you may begin to see some dips on the runtime curves near the end of those runs.

    Also, BabyDoc informs me that the optional 3-minute Auto-Off feature is incompatible with the ODP - due to circuit limitations, turning on the Auto-Off feature toggles the ODP off. The Auto-Off feature may be useful to you if you are worried about accidental activation - but I think locking out the head for EDC carry is a much better idea. If you do use the Auto-Off, keep in mind the lack of ODP.


    Pulse-Width-Modulation (PWM)

    Like all continuously-variable lights, the LF2XT uses PWM to create its lower output modes. As usual for LiteFlux, the PWM is at a sufficiently high frequency as to be undetectable by the naked eye. I measured my LF2XT samples at a frequency of 1.92 kHz (i.e. 1920 cycles per second), at all output levels including Max.

    LF2XT


    Basically, you will only be able to detect this level of PWM if you shine the light at a very rapidly moving fan (and even then, the effect is subtle). Note that this frequency is slower than the earlier LF3XT, which was around 7.8 kHz (sound card oscilloscope trace shown at the same scale below)

    LF3XT


    Either way, it is not a concern – you won't notice it on either light in practice (unlike <300 Hz PWM, which I typically find very )

    Response Lag

    One last thing to note – due to how the MCU operates, there is a brief lag before a button press is registered and the light responds (except for turning on, which is instantaneous). As such, you can't rapidly double-click within 0.3 secs, or the light won't register the two separate actions (i.e. you have to allow 0.3 secs between each click). This takes some getting used to - but once you master taking it a bit slower, you should have no problems controlling the light.

    Testing Method: All my output numbers are relative for my home-made light box setup, a la Quickbeam's flashlightreviews.com method. You can directly compare all my relative output values from different reviews - i.e. an output value of "10" in one graph is the same as "10" in another. All runtimes are done under a cooling fan, except for the extended run Lo/Min modes (i.e. >12 hours) which are done without cooling.

    Throw values are the square-root of lux measurements taken at 1 meter from the lens, using a light meter.

    Throw/Output Summary Chart:



    Note in the comparison above that my Fenix L0D is an early edition with a Cree P4. Based on a 350mA drive current (where Cree Output bins are determined), a Cree Q4 emitter would be expected to be ~25% brighter on average, and a Cree R2 would be ~40% brighter on average, for the same drive current. Note there is typically a ~7% output range over which an emitter is binned, so those numbers are just representational averages.

    My two LF2XT samples are fairly close to each other in terms of Max output on most batteries, but are a little more variable in terms of throw (likely due to exact reflector placement during assembly). They are certainly well within the range I expected, and both have very good throw and output for this class of light – on all batteries.

    Min output is remarkably low, although not quite as low as my LF3XT samples (which were 0.2-0.3 ROV for CR123A, and 0.4-0.5 for RCR). But the only other 1xAA or 1xCR123A lights that go as low as the LF3XT in my testing are the 4Sevens Quark and Novatac 120P (both ~0.2 ROV).

    UPDATE April 13, 2015: In the years since this review came out, I have revised my testing protocol to provide more accurate ANSI FL-1 type measures. Specifically, I have devised a method for converting my lightbox relative output values (ROV) to estimated Lumens. See my How to convert Selfbuilt's Lightbox values to Lumens thread for more info.

    I now also produce summary tables, reported in a manner consistent with the ANSI FL-1 standard for flashlight testing. Please see http://www.flashlightreviews.ca/FL1.htm for a discussion, and a description of all the terms used in these tables. Effective July 2012, I have updated all my Peak Intensity/Beam Distance measures with a NIST-certified Extech EA31 lightmeter (orange highlights).

    Here is how the LF2XT (black version, on both NiMH AAA and 10440 Li-ion) from this review compares to more modern lights:



    While max output is not as high, the LF2XT still remains quite competitive (especially on 10440). It also has among the lowest Min output I've seen in this class.


    Variable Output Ramping



    The CUI of the LF2XT uses a visually-linear ramp upon press-and-hold (shown above). It is in fact very similar in time scale to the LF3XT.

    Output/Runtime Comparison:



    Note above that I inadvertently left the low-voltage protection feature turned on for the Max alkaline run. As you can see, this triggers a shut-down of the light while the battery still has a lot of charge remaining. I immediately restarted the light and toggled off the protection for the remainder of the run.



    All the initial runtimes (shown below) were done on the Natural finish sample (labelled LF2XT #1). I have done a few additional runs on the Black finish sample (labelled LF2XT #2).















    Output/Runtime Comments:

    I don't have a lot of 1xAAA lights to compare to, and I would remind everyone again that my Fenix L0D is only a Cree P4 output bin (i.e. a Q4 would typically be ~25% brighter for the same drive current).

    But I am VERY impressed with the output/runtime performance of the LF2XT on all batteries, at all levels. Performance is simply outstanding!

    A lot of lights don't work too well on AAA alkaline batteries (due to their lower storage capacity and discharge limits), but the LF2XT is very impressive at all outputs. Of course, I don't recommend alkalines given their propensity to leak and potentially damage the light they are in.

    Certainly no qualms about recommending any form of NiMH, including Sanyo Eneloops. A *really* nice feature is the low-voltage cut-off protection, which will prevent you from running down you NiMH cells and potentially damaging them. Good job – I wish more manufacturers would implement this! Note that there is some variability in max output and runtime on the two samples I tested on Eneloops – this likely reflects Vf difference between the sample emitters.

    And I am frankly stunned by how long my AW 10440 Li-ion batteries last in these lights (again, protected thanks to the light's low voltage cut-off feature). There was a bit variability in output/runtime between two batches of 10440s in my collection (both purchased in 2007 and barely used), so YMMV. And you can see that my second LF2XT has shorter runtime than the first. But certainly a great way to pack a lot of storage density into a small form factor (and in a fully supported and protected way).

    Potential Issues

    As mentioned previously, there is ~0.3 sec lag in responding to button presses (aside from turning On, which is instantaneous). Button also has a much shorter traverse and is softer feeling than a standard clicky - in keeping with being an electronic switch as opposed to a traditional switch. Not really problems per se, just a different set of expectations that may take some getting used to.

    Although undocumented, BabyDoc confirms that enabling the auto-shut-off feature (i.e. shuts down after 3mins of runtime) automatically disables the low-voltage over-discharge protection (ODP) for NiMH/Li-ion. Apparently there are a limited number of memory positions for the light, and you can't have both features running simultaneously.

    General Observations

    I said it in my LF3XT review, and I'll say again here - I'm very impressed with this light so far.

    I think LiteFlux suffers from a perception issue that their circuits are just too complicated to operate without a manual. This isn't the case at all – as set out of the box, the default compact interface is virtually identical to the popular NiteCore D10/EX10. If you can press a button, you can easily use this interface.

    It's true the full user interface will require the use of the manual/flowchart to allow you set the features. But once set, the light is ridiculously simple to operate. Again, if you can turn on and switch modes in a Novatac or Ra light, you can use a programmed LF2XT/LF3XT. And the LiteFlux lights have a lot more features that you can program and customize than just about any other light. Set the Full UI the way you want with the manual, and then it's child's play to use without one.

    Personally, I found the earlier twisty-model LiteFluxes to be a little finicky to operate and confusing to program. But the LF2XT/LF3XT series have two of the best user interfaces built-in, with a load of innovative features that are well worth price of admission (e.g. fully regulated Li-ion support, user-selectable low-voltage protection features for both Li-ion and NiMH, etc.).

    Oh, and have I mentioned the outstanding runtime performance, on all batteries – including alkalines?

    The beam is also very attractive with its neutral-warm 4C emitter (although relatively warm WH tints in cool white R2 should also be available by now). Despite the small reflector, the LF2XT's beam is very nice with minimal evidence of rings and a smooth transition from spot to spill. Overall spillbeam width is also a reasonable size.

    Build quality is also high in my books. Light feels solid enough to finally replace the 1xAAA Jet-µ on my keychain. I'm going to EDC it for awhile and let you know how it goes. But based on my extensive EDCing of the LF3XT, I don't expect any major issues.

    P.S.: While I generally don't like discussing value-for-money in my reviews (since I think that is a very personal thing), I have to say that these seem like a great deal for <$65 shipped.
    Last edited by selfbuilt; 04-23-2015 at 01:23 PM.
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  2. #2
    Flashaholic* nanotech17's Avatar
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    thanks for the review.
    another priceless hard work from you.
    i'm gonna have to digest these review later



  3. #3
    Flashaholic* strinq's Avatar
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Been waitign for more reviews of this light for quite some time.
    But I think a lot of people would want a comparison to the Fenix LD01 which is I think currently the most popular 1 x AAA light besides the LF2XT and LF2X.
    Then it comes to be that the soothing light
    At the end of your tunnel
    Was just a FREIGHT TRAIN coming your way...

  4. #4

    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Thanks for the review mate, this will be invaluable to anyone considering buying this light. I'm really impressed by the runtimes on 10440's at max, I thought it would be more like ten minutes!

    Really enjoying my LF2XT: it's like a perfectly balanced scalpel, and makes my other lights look like crudely sharpened sticks.
    Last edited by qtaco; 07-06-2009 at 05:23 AM.

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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Thanks so much for the review!

    Could you tell me how your ODP works? when it starts flashing and how long it does? I found my ODP working a little strange, as soon as I discharge my battery I'll check again what it does and tell you.
    Preon Stealth Black

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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    An outstanding review of a light that has attracted enthusiastic notices everywhere. Its performance seems extraordinary, and it is packed with features (which can easily be bypassed if desired). The low-voltage cut-off is an especially useful innovation.

    Moving to the Reviews section.
    Resistance is futile...

  7. #7

    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by strinq View Post
    But I think a lot of people would want a comparison to the Fenix LD01 which is I think currently the most popular 1 x AAA light besides the LF2XT and LF2X.
    I can believe that ... but I don't own one, and Fenix has never expressed any interest in sending me anything to review. Given all the requests from other makers I've been getting lately, I only really have time to do invited reviews now-a-days.

    Quote Originally Posted by qtaco View Post
    Thanks for the review mate, this will be invaluable to anyone considering buying this light. I'm really impressed by the runtimes on 10440's at max, I thought it would be more like ten minutes!
    Yes, I was quite surprised by how well these lights did on my old 10440s. A very impressive result.

    Quote Originally Posted by HighLumens View Post
    Could you tell me how your ODP works? when it starts flashing and how long it does? I found my ODP working a little strange, as soon as I discharge my battery I'll check again what it does and tell you.
    Thanks, I forgot to mention that (just updated the review text).

    On my Natural LF2XT (i.e. "LF2XT" or "LF2XT #1" in the runtimes), the light started flashing intermittently within a couple of minutes before cutting out. These flashes are fairly slow initially, but increase in frequency just before shut down. However, since they only start in the last couple of mins, they weren't picked up in any of the runtime traces (where output is sampled at 30 sec intervals). My Black LF2XT seems to start showing the flashing a minute or two earlier, so you may begin to see some dips on the runtime curves near the end of those runs as I do more runtimes.

    Quote Originally Posted by DM51 View Post
    An outstanding review of a light that has attracted enthusiastic notices everywhere. Its performance seems extraordinary, and it is packed with features (which can easily be bypassed if desired). The low-voltage cut-off is an especially useful innovation.
    Yup, I think this light is a real winner. LiteFlux continues to impress with its innovative circuits (and build quality seems quite high too)
    Last edited by selfbuilt; 07-06-2009 at 07:50 AM.
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    *Flashaholic* Flying Turtle's Avatar
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Excellent review, as always, of my newest favorite light. Thanks, selfbuilt.

    Geoff

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    Flashaholic* strinq's Avatar
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Mine will be here in 2 days. Can't wait man.
    Then it comes to be that the soothing light
    At the end of your tunnel
    Was just a FREIGHT TRAIN coming your way...

  10. #10
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Great review,don't know if I missed it but! another great feature of this light is the 3min+ auto off,forgive me if you mentioned it somewhere
    Before you criticize someone, you should walk a mile in their shoes.
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by TITAN1833 View Post
    Great review,don't know if I missed it but! another great feature of this light is the 3min+ auto off,forgive me if you mentioned it somewhere
    This feature, however, will, if activated, deactivate the ODP, which is not a problem as long as you are aware of it. Unfortunately, LiteFlux, because of limitations of programming space, could not resolve this problem without eliminating the optional Auto/off entirely. My only complaint is the user manual doesn't warn anyone of this operational problem. Paradoxically, Auto/OFF when enabled saves your battery from being accidentally depleted, but when turned on, overides or disables the ODP which should be protecting a rechargable from damage should it get depleted.

    Therefore it is recommended using Auto/OFF only with primaries. Keep Auto/OFF turned off and ODP turned on when using rechargables, and you will have no problem.
    Last edited by BabyDoc; 07-06-2009 at 10:54 AM.

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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Great review selfbuilt. Except one thing - now I think I'm going to have to buy another one
    I am definitely going to go for one of the R2 cool white when they come out - didn't know they had decided to do a run of those.
    May I ask what AAA NiMH 900mah battery was used in this test? It seems to have done quite a bit better than the Eneloop and I need to pick up some good AAA NiMH batteries.
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  13. #13

    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by TITAN1833 View Post
    Great review,don't know if I missed it but! another great feature of this light is the 3min+ auto off,forgive me if you mentioned it somewhere
    I am aware of it, but didn't think to mention in the rather lengthy review text. Personally, I prefer to lock out my lights for EDC (quarter-turn head twist), so the auto-off feature isn't very useful for me.

    Quote Originally Posted by BabyDoc View Post
    This feature, however, will, if activated, disactivate the ODP, which is not a problem as long as you are aware of it. Unfortunately, LiteFlux, because of limitations of programming space, could not resolve this problem without eliminating the optional Auto/off entirely. ...
    Therefore it is recommended using Auto/OFF only with primaries. Keep Auto/OFF turned off and ODP turned on when using rechargables, and you will have no problem.
    Ah, good to know - another reason why I won't be using it. I'll add a point to the review text.

    Quote Originally Posted by matrixshaman View Post
    May I ask what AAA NiMH 900mah battery was used in this test? It seems to have done quite a bit better than the Eneloop and I need to pick up some good AAA NiMH batteries.
    Eneloop AAAs are only rated to ~800 mAh (750 mAh guaranteed). According to my Maha charger, most of mine have been in the low 800s brand new.

    The 900mAh NiMH in question were provided by Lumapower for the Avenger GX review (green wrapping, no label - printed "HI-WATT NiMH"). My Maha charger rates them at closer ~950mAh, which is very consistent with my older Energizer 1000mAh rated cells that I used in some of the older L0D/Jet-µ runs.
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  14. #14
    Flashaholic* Crenshaw's Avatar
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    The LF2X is slightly brighter on 10440s, however i believe Lightflux has done something smart, they probably toned down the drive level on max so that you get reasonable runtime, instead of the few minuites or so on max with the Lf2x before it starts warning you of low voltage.

    I read somewhere also that the Lf2x is slightly dimmer then the Ld01 on max.

    Crenshaw

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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by BabyDoc View Post
    This feature, however, will, if activated, disactivate the ODP, which is not a problem as long as you are aware of it. Unfortunately, LiteFlux, because of limitations of programming space, could not resolve this problem without eliminating the optional Auto/off entirely. My only complaint is the user manual doesn't warn anyone of this operational problem. re, Paradoxically, Auto/OFF when enabled saves your battery from being accidentally depleted, but when turned on, overides or disables the ODP which should be protecting a rechargable from damage should it get depleted.

    Therefore it is recommended using Auto/OFF only with primaries. Keep Auto/OFF turned off and ODP turned on when using rechargables, and you will have no problem.
    Advice duly taken
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  16. #16
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by selfbuilt View Post
    Thanks, I forgot to mention that (just updated the review text).
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by Crenshaw View Post
    The LF2X is slightly brighter on 10440s, however i believe Lightflux has done something smart, they probably toned down the drive level on max so that you get reasonable runtime, instead of the few minuites or so on max with the Lf2x before it starts warning you of low voltage.

    I read somewhere also that the Lf2x is slightly dimmer then the Ld01 on max.
    I agree - on both points.

    As the Fenix lights run direct drive on 10440 on Hi, any LD01 will definitely be brighter on 10440 (given that my lowly P4-based L0D was actually brighter than the LF2XTs on 10440). I would expect a LD01-Q5 should be at least 30% brighter than my L0D-P4. But I would also expect runtimes in ~10-15 min range on a LD01 (and rapidly diminishing at that), versus the 30-45 mins regulated seen for all my LF2XT runs.

    I'm still rather amazed by all the folks who run their L0D/LD01 on 10440. If you happen have one with a low Vf, you are really going to be subjecting everything to a pretty high current drain. Not good for emitters, circuits, or batteries ...

    And so, yes, I agree that this is pretty smart on LiteFlux's part.
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by HighLumens View Post
    as soon as I discharge my battery I'll check again what it does and tell you.
    Ok, I've run mine for a while and I paid attention to the ODP. It does 18 flashes (a couple of times I counted 17, and I'm quite sure I didn't loose the 18th flash) and then it turned off. Every time I turned it on again and checked the battery voltage, so I knew it started flashing at aound 1.1 volt and continued up to 0.76 (here I stopped). Is this the correct behavior of the ODP?
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    The main complaint with the D10/EX10 interface is that your custom-set level is erased when you use the shortcuts (i.e. jump to Min, and Min is now your new custom-set level).
    This is more a question of user preference than anything else. The D10 always comes back on at the same level you had when you switched it off. From the way you describe it, the LiteFlux violates this basic principle: it's on max, you switch off, then back on again a moment later and it's on a different setting. Fair enough for those who like that sort of thing - but I'll stick with the D10 thanks.

    The second complaint is that you have try twice to activate the ramp after using a shortcut, since it remembers the previous ramp direction.
    Again, to be fair - this was a problem on earlier batches but has long since been fixed. If you buy a D10 or EX10 now, it will ramp as expected.

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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by HighLumens View Post
    Ok, I've run mine for a while and I paid attention to the ODP. It does 18 flashes (a couple of times I counted 17, and I'm quite sure I didn't loose the 18th flash) and then it turned off. Every time I turned it on again and checked the battery voltage, so I knew it started flashing at aound 1.1 volt and continued up to 0.76 (here I stopped). Is this the correct behavior of the ODP?

    I had the same question as my LF2XT also does that. When on 100% (running on 900mAh NiMH) it flashes 18 times before cutting off, though it seems that there is an ever so slight pause after the first three flashes - low voltage warning first? Haven't checked to see if it does the same on a lower light mode.

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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Selfbuilt, I love your reviews they're comprehensive, objective, enjoyable! Great job!

  22. #22
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by Moonshadow View Post
    This is more a question of user preference than anything else. The D10 always comes back on at the same level you had when you switched it off. From the way you describe it, the LiteFlux violates this basic principle: it's on max, you switch off, then back on again a moment later and it's on a different setting. Fair enough for those who like that sort of thing - but I'll stick with the D10 thanks.
    Both the LF2XT & LF3XT will mimic a D10. Turn on a D10. Ramp it up to max. Turn it Off. Turn it back On. It comes back On at max. Do this with the LiteFlux's and it will do the same thing. Where ever you ramp to from turn On, and then turn Off, they come back On at that level, just like a D/EX10.

    It's just that the LiteFlux's have the ability to remember a user setting, if you so choose, by using the shortcuts to Hi or Lo for a quick change in output. Usually only needed temporarily. That way, your most used setting is retained for the next time you use your light. You have the best of two worlds, so to speak, and all that is needed is understanding how it works and how you want the light to act in that circumstance.
    Last edited by Lite_me; 07-06-2009 at 07:25 PM.
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  23. #23

    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by HighLumens View Post
    Ok, I've run mine for a while and I paid attention to the ODP. It does 18 flashes (a couple of times I counted 17, and I'm quite sure I didn't loose the 18th flash) and then it turned off. Every time I turned it on again and checked the battery voltage, so I knew it started flashing at aound 1.1 volt and continued up to 0.76 (here I stopped). Is this the correct behavior of the ODP?
    That sounds believable to me, although haven't sat down to measure it on my two samples. I suspect it is likely to be a bit variable from one light to another, since it is presumably triggered by a voltage level

    Quote Originally Posted by Moonshadow View Post
    This is more a question of user preference than anything else. The D10 always comes back on at the same level you had when you switched it off. From the way you describe it, the LiteFlux violates this basic principle: it's on max, you switch off, then back on again a moment later and it's on a different setting. Fair enough for those who like that sort of thing - but I'll stick with the D10 thanks.
    Again, to be fair - this was a problem on earlier batches but has long since been fixed. If you buy a D10 or EX10 now, it will ramp as expected.
    I've revised the UI description text above. Most of this was taken from my LF3XT review, when the ramp issue was still present on the D10/EX10. Indeed, I was unaware this had been corrected - the last D10 I bought new in February still had the ramp direction retention issue. Glad to hear they fixed it.

    I agree that the difference in how the memory feature works upon turn off/on is entirely a question of user preference. But the LF2XT/LF3XT does feature an improvement in that the shortcut keys are toggles to-and-from the user defined level to Max/Min. There was certainly a lot of complaining around here about the lack of retention of the custom user mode level once a shortcut was used in the D10/EX10.

    But this is separate from how the lights retain the last setting, and there are significant differences there. I realize this may be confusing for those who don't have both lights, so let me give three situations that may help people choose what they prefer.

    1. Turn on the light, ramp to your desired level, turn off the light. When you turn back on, you are at the level you left it when you shut off (i.e. user defined) - for both the D10/EX10 or the LF2XT/LF3XT

    2. Now turn off/on the light again, jump to max output (click, press-hold), turn off the light. When you turn back on, you are at the original user defined level in step #1 (LF3XT/LF3XT) or at Max brightness (D10/EX10).

    3. Now turn off/on the light again, jump to Min output (double click), ramp up to a higher level, turn off the light. When you turn back on, you are again at the original user defined level from #1 (LF3XT/LF3XT) or at the level you turned off the light (D10/EX10).

    The key point here is that the LF2XT/LF3XT disregards any level set after using a shortcut jump. Unless of course you toggle back to the user defined level first, and ramp from there (that will then be retained). I find this takes some getting used to - personally, I would prefer that memory kicked in if I instigated a ramp after using a shortcut.

    But again, how the memory is implemented is separate from the fact that you won't erase your custom set level by using a shortcut on LiteFlux like you will on the NiteCore.
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Thanks for the clarification, Selfbuilt.

    3. Now turn off/on the light again, jump to Min output (double click), ramp up to a higher level, turn off the light. When you turn back on, you are again at the original user defined level from #1 (LF3XT/LF3XT)
    That's the one that would drive me nuts, I think. With the D10, I'm quite used to jumping to max and then ramping down a little bit to set a high-ish level or jumping to min and ramping up if I want a fairly low level. Having the light forget that and go back to some previous level would be really annoying.

    Just makes life more complicated - you have to remember how you got to a particular level. Still, we do all have different preferences and will use the lights in different situations, so it's good that the manufacturers give us such a wide range of choices.
    Last edited by Moonshadow; 07-07-2009 at 12:00 AM.

  25. #25

    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by HighLumens View Post
    Ok, I've run mine for a while and I paid attention to the ODP. It does 18 flashes (a couple of times I counted 17, and I'm quite sure I didn't loose the 18th flash) and then it turned off. Every time I turned it on again and checked the battery voltage, so I knew it started flashing at aound 1.1 volt and continued up to 0.76 (here I stopped). Is this the correct behavior of the ODP?
    This 18 flashes should be 3 warning flashes at 1.0V low battery voltage (under load) immediately followed by 15 flashes at 0.8V overdischarge protection voltage under load.
    The ODP algorithm of LF2XT can be described as:
    1. If the battery voltage under load reaches low battery warning voltage of 1.0 V for NiMh or 3.1V for 10440 Li-ion, the warning signals of 3 flashes will be generated every 35 seconds.
    2. If the battery voltage under load reaches overdischarge protection voltage of 0.8 V for NiMh or 2.8V for 10440 Li-ion, 15 flashes will be generated before forced turning-off.
    3. There is no mandatory interval between 3 flashes of low voltage warning and 15 flashes of overdischarge protection.

    If the internal resistance of the NiHN battery is too large, the discharge period from 1.0 V under load to 0.8V under load will be so short that 3 flashes of low voltage warning will be immediately followed by 15 flashes of overdischarge protection.

    While new AAA eneloop with excellent health status is used for OPD testing, you will experience several separate 3 warning flashes in two or three minutes before final 15 flashes of overdischarge protection.

    Similar situation with respect to internal resistance of battery will also apply to 10440 Li-ion.

  26. #26
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by juplin View Post
    This 18 flashes should be 3 warning flashes at 1.0V low battery voltage (under load) immediately followed by 15 flashes at 0.8V overdischarge protection voltage under load.
    The ODP algorithm of LF2XT can be described as:
    1. If the battery voltage under load reaches low battery warning voltage of 1.0 V for NiMh or 3.1V for 10440 Li-ion, the warning signals of 3 flashes will be generated every 35 seconds.
    2. If the battery voltage under load reaches overdischarge protection voltage of 0.8 V for NiMh or 2.8V for 10440 Li-ion, 15 flashes will be generated before forced turning-off.
    3. There is no mandatory interval between 3 flashes of low voltage warning and 15 flashes of overdischarge protection.

    If the internal resistance of the NiHN battery is too large, the discharge period from 1.0 V under load to 0.8V under load will be so short that 3 flashes of low voltage warning will be immediately followed by 15 flashes of overdischarge protection.

    While new AAA eneloop with excellent health status is used for OPD testing, you will experience several separate 3 warning flashes in two or three minutes before final 15 flashes of overdischarge protection.

    Similar situation with respect to internal resistance of battery will also apply to 10440 Li-ion.
    I' am using brand new original Eneloop (they have been charged and discharged once in a proper way). Perhaps it's that I ran it quite heavy (50 and 100% continously) so the 18 flashes were actually 3+15flashes...

    I'll repeat the discharge, this time at 10% and I hope I'll se the 3 flashes every 35 seconds while the LF stays on. I just have to wait 8 hours

    Last edited by HighLumens; 07-07-2009 at 03:28 AM. Reason: grammar mistake
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  27. #27
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Funny. I just noticed the flashing on mine. Could have sworn the ODP was turned off. I must have accidentally toggled it on at some time. Thought my light was having a seizure.

    Geoff

  28. #28

    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by HighLumens View Post
    I' am using brand new original Eneloop (they have been charged and discharged once in a proper way). Perhaps it's that I ran it quite heavy (50 and 100% continously) so the 18 flashes were actually 3+15flashes...
    I just tried the ODP on a nearly depleted regular alkaline and L92 lithium cell running on Max, and both times there was no discernable gap between the 3 and 15 flashes before shut-down (i.e. looked like 18 continuous).

    But when I let the alkaline cell recover for a few secs and turned it back on Min, there was about ~30 secs between the initial 3 flashes and the later 15.

    So it is likely dependent on battery chemistries and how hard you are driving the light at the time.
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    I think we all appreciate the incredible amount of extremely high quality work that selfbuilt contributes to CPF. Recently, with this LF2XT review and others (Quarks, Avenger GX, etc.), he has been working at such a pace that I don't know how he sleeps!

    He not only posts his terrific reviews, but then sticks around and addresses all the many follow-up comments and questions---incredible!

    So, I just made a donation to selfbult's battery fund, which can be found in his sigline, or here: http://www.sliderule.ca/cpf.htm
    I hope my CPF brothers will join me in chipping in---selfbuilt is a precious resource around here, and the least we can do is keep him loaded with cells!

    Thanks.
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    Default Re: LiteFlux LF2XT Review (1xAAA) - RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by HighLumens View Post
    I'll repeat the discharge, this time at 10% and I hope I'll se the 3 flashes every 35 seconds while the LF stays on. I just have to wait 8 hours

    Quote Originally Posted by selfbuilt View Post
    But when I let the alkaline cell recover for a few secs and turned it back on Min, there was about ~30 secs between the initial 3 flashes and the later 15.
    I did the same: I didn't want to run down a fully charged Eneloop and wait so much, so I used an already almost discharged cell (old ni-mh 600 mAh).

    Running the LF at 10% it still did 18 flashes.
    Running it at Min I got something similar to the 3 advertised flashes every 35 seconds and finally 15 (or 18? sorry I don't recall it ). I say something similar because I actually got this: Costant On->Off->On->Off->On->Off->Costant On. I would call them 2 flashes, not 3!

    Anyway, as soon as I disharge the Eneloop I'll set it to 10% looking for 3 flashes every 35 seconds and if I don't get them I' ll set it to Min. I'll try to record everything but I can't assure it.
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