Klarus Light
Results 1 to 13 of 13
  1. #1

    Thumbs up Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHOTS+

    Warning: pic heavy, as usual.



    Specifications:
    • LED: Cree XP-G R5
    • SmartRing II 'Infinitely Variable' digitally controlled brightness system- allows the user to preselect any output level or a tactical strobe mode.
    • Max output: 345 lumens, Min output: 0.003 lumens
    • Runtime: Min Output- 7 days, Max Output- 2 hours
    • Effective illumination distance: 133 meters
    • Powered by 2 x CR123A or 1 x 18650 Battery
    • Tailcap switch controls power on/off.
    • Made from military grade T6061 aluminum alloy for unprecedented durability
    • Mil-Spec type III Hard-Anodized scratch and corrosion resistant finish
    • Anti-rolling rugged design
    • Durable titanium alloy clip
    • Waterproofing Standard: IPX-8 (waterproof for 1 hour at a depth of 2 meters)
    • Dimensions: Bezel diameter- 0.92 in (23.4 mm), body diameter- 1.0 in (25.4 mm) with a total length of 4.96 in (126 mm)
    • Weight: 2.2 oz (62.4 g)
    • Compatible with the Surefire E Series tubes.
    • Package Contents: 1 x NiteCore Infilux IFE2, 1 x Lanyard, 1 x Spare rubber switch, 2 x Spare rubber o-rings, 1 x Instruction booklet
    • Estimated street price: ~$130.
    It has been awhile since I’ve reviewed a Nitecore light. The IFE2 is certainly distinctive, and seems to be something of a refresh for the maker. How does it compare to others in yhe XP-G R5 class? Scroll down and see.




    Packaging is fairly typical Nitecore. Inside the hard cardboard box with magnetic closing clasp is the light in cut-out foam, with a wrist strap, spare o-rings and boot cover, manual, and warranty card.



    From left to right: CR123A, AW protected 18650, Nitecore IFE2, 4Sevens Quark 123-2, Klarus NT20, Eagletac P20C2-II, ITP SC2.

    IFE2: Weight: 65.1g (no battery), Length 127.1mm x Width 23.6mm (bezel)

    As you can see from the photo line-up, The IFE2 is quite small for this class of light. In fact, most of the other lights this small can’t take protected 18650 cells (i.e. body diameter is too narrow). You are lucky if protected 17670 will fit – and often have to go down to 14670. I’m happy to report the IFE2 body takes all my protected 18650 cells.

    However, most of my recent high-capacity cells (even the button tops) wouldn’t light up the IFE2. I believe this due to top of the cells not fitting into the head opening (which is slightly narrower than the body on my sample). Certainly, flat-tops or large button-tops won’t work, as there is a raised disc around the positive contact surface in the head (see below).





    Tailcap threads are anodized for lock out. The light cannot tailstand. Knurling is not overly aggressive, but the number of body elements helps with grip. Clip is fairly basic, and held on with Allen screws.

    Anodizing is excellent on my sample, no chips in the dark gray natural finish (HA = type III). The color is a departure for Nitecore - it looks almost silver-gray. Lettering is sharp and bright.

    Switch is a forward clicky, with a slightly longer than typical traverse.




    The IFE2 features the Cree XP-G R5 Cool White. The reflector is textured to what I would consider a medium orange peel (MOP). The head opening is not very large, so I would not expect much throw from the IFE2.

    Which brings us to the requisite white wall hunting . All lights are on Hi on 18650 (AW Protected where available), about ~0.75 meter from a white wall (with the camera ~1.25 meters back from the wall). Automatic white balance on the camera, to minimize tint differences.













    As you can see, the IFE2 is definitely not a thrower. I found the beam to have a pleasant transition from hotspot to spill. Scroll down to my Summary Tables for more specifics on output and throw.

    User Interface

    Turn the light on by the tailcap switch. Half-press the tailcap for momentary-on, click for locked-on

    Mode switching is controlled by the magnetic control ring in the head. The IFE2 features a continuously-variable interface – you control the output level by twisting the ring. You can select your desired mode while the light is off.

    The ring traverses a little over 2/3 of the circumference of the light. There is one clear and firm detent just below the minimum output, which is a standby mode. Interestingly, strobe is “hidden” just below this detent (i.e. turn the ring a little past the detent to activate strobe).

    Ramping Pattern

    EDIT: this section has been updated and revised from my initial post.

    The big question is whether the output selection of the IFE2 is "visually linear". Generally, here on the forums, that has been taken to mean a logarithmic ramp as opposed to an actual linear ramp of outputs. The reason for this is that we perceive brightness in a non-linear way (actually, not just brightness - most of our sensory perceptions are non-linear). This is why twice the lumens doesn't appear twice as bright to us - lumens are an objective (linear) measure of output, and our subjective perceptions are not linear.

    A logarithmic adjustment has long been used to adjust for our relative visual perceptions (e.g. the stops of camera are logarithmic). And like most here, up until now I have found that all continuously-variable lights with a logarithmic correction of output generally look "visually-linear". And then the IFE2 (and Sunwayman V10A, which shares a similar circuit) came along.

    To start, here is what the IFE2 looks like in my lightbox. To measure this, I slowly turned the ring at as close to a constant rate as I could manage, over ~40 secs or so. My lightbox collected output readings every second, and I then plotted the relative lightbox output against the estimated degree shift of the ring (i.e. with 360 degrees being a complete turn). Note the ring turns a little over 2/3 the circumference of the light, or about ~280 degrees.



    I have blown-up the first third of the ramp in the inset graph, to show you that output does indeed increase over the whole ring (albeit seemingly slowly at first). Now, you can certainly argue that the output trace looks like it could be logarithmic. Indeed, if you plot it on a log scale, you get something approximating a straight line. However, the IFE2 does NOT subjectively appear to me to be visually-linear when handling (e.g. it does indeed spend a lot of time at the very low outputs over the first third of the ring).

    Upon reviewing the scientific literature, I see that relative power relationships have superseded simple logarithmic corrections for linearizing our sensory perceptions. For perceived brightness, the currently accepted linearization method is actually a cube root of output. For a full discussion of this - including detailed graphs and primary literature references - please see post #28 in my V10A review.

    When plotting with a cube root transformation of my lightbox's output scale, you get the following graph:



    This graph MUCH better matches what I see by eye for the IFE2, compared to a logarithmic plot. I have added the LiteFlux LF5XT (on 14500) to the graph, as it does both a linear ramp and a logarithmic step pattern. The linear and logarithmic ramps of the LF5XT also pretty closely match my relative perceptions.

    The point to the above is to show that the IFE2 goes to much lower outputs than any other linear or logarithmic continuously-variable light I've seen before. It also betters matches what I subjectively see across the whole range of outputs on these lights. So for now on, I will also include this type of plot (along with standard linear plots) for all the continuously-variable lights I review.

    All that aside, I actually consider this dynamic range control of the IFE2 to be superior to a purely “visually-linear” ramp across the whole range. The logarithmic correction allows you to exquisitely fine-tune your low output selection. And once you get into brighter outputs, the proportional increase seems quite linear.

    Intrepid readers may notice that the IFE2 has almost exactly the same pattern and low level as the Sunwayman V10A which I have recently reviewed. Please see that thread for a greater discussion of the relative ramping patterns.

    Current Draw

    You would hope that this wide range of low modes translates into a range of super-long runtimes. Unfortunately, the circuit overhead for this level of control is considerable, and Nitecore estimates only one week of runtime at the lowest level.

    I have measured the battery current draw at both the standby detent and at the lowest output level, and get 11mA on 1x18650 in both cases. For a standard capacity 2200mAh 18650, that would translate into 8.3 days (consistent with Nitecore’s 1-week estimate). On 2xRCR (750mAh capacity), I measured 5mA, which would translate into just under a week.

    PWM

    I presume the light uses PWM for the variable outputs, but I was unable to detect the frequency with my setup (which means it must be in the high kHz range). It is certainly not detectable visually.

    At the highest output levels (i.e. over the last quarter turn of the ring), I was able to detect a weak signal in the 1.7-1.8 kHz range. This seems to be some sort of circuit artefact – it definitely isn’t the PWM freq, as you could easily spot those levels with an oscillating fan.

    Once again, that is remarkably similar to what I noticed on the Sunwayman V10A.

    Strobe



    Measured at 12 Hz in my testing.

    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 any extended run Lo/Min modes (i.e. >12 hours) which are done without cooling.

    I have recently devised a method for converting my lightbox relative output values (ROV) to estimated Lumens. See my How to convert Selfbuilt's Lighbox values to Lumens thread for more info.

    Throw/Output Summary Chart:

    Effective November 2010, I have revised my summary tables to match with the current ANSI FL-1 standard for flashlight testing. Please see http://www.sliderule.ca/FL1.htm for a description of the terms used in these tables.







    The max output and throw of the IFE2 are quite reasonable and consistent with its emitter and reflector design. The lowest output mode is incredibly dim - I can’t accurately measure it in my lightbox. Simply put, you can stare into the illuminated emitter quite comfortably at the lowest levels.

    Output/Runtime Comparison:





    Note that although the specs do not mention 3.7V RCR, I found no issue with running my sample on 2xRCR. Of course, I presume that RCR is not officially supported, so you may run into a warranty problem if you encounter any issues.






    Overall efficiency seems quite good across the range of levels tested, considering the continuously-variable interface and (presumed high frequency) PWM-control. Of course, a current-controlled light with a limited number of defined (and optimized) output levels would be expected to outperform at comparable outputs. But this is a very good result for a continuously-variable light.

    Potential Issues

    Flat-top and some high-capacity button-top 18650 cells may not fit in the light. Standard protected 18650 fit fine, though.

    Preliminary Observations

    The IFE2 is a very nicely designed light - I quite like the build and user interface.

    Certain aspects of this light seem like classic Nitecore to me, while others seem to have been brought over from other makers. I should point out that JetBeam and Nitecore are now owned by the same parent company, which may explain some of the “cross-talk” I’ve seen on recent models for both companies. In this case, I suspect Sunwayman is also involved with the circuit design somehow, given the close similarity in performance to the V10A I reviewed recently.

    To start with the build, I personally quite like the minimalist size and style. Hand-feel is good, and the light is surprisingly light and easy to pocket. Pocket-clip is pretty basic though, and the switch feels a little light-weight. Be aware, this is not a beefy light.

    I can believe the 0.003 lumen low level spec for the IFE2 – this light has probably the lowest low I’ve ever seen. And the dynamic range of the continuously-variable control ring is excellent. While not consistently “visually-linear” in the classic sense, it is quite cleverly designed to allow you to access a very wide range of low outputs, and then quickly access a roughly visually-linear set of high outputs. This is only the second time I’ve seen this particularly useful pattern (see my Sunwayman V10A review for a comparison).

    IMO, one advantage the IFE2 has over the V10A is a much wider traverse of the control ring (~2/3 the circumference of the light in this case). Coupled with knurling on the ring for enhanced grip, it’s even easier to select the output mode you want here. The IFE2 has a standby detent below the lowest level, and strobe mode “hidden” on the other side of it.

    Like the V10A, I like the lack of detectable PWM on the IFE2 (rare on a continuously-variable light). Output/runtime efficiency seems very good across the range of outputs directly measured (again, surprisingly good for a continuously-variable light). However, the overhead on the circuit remains fairly high, and the estimated 1 week runtime on the lowest setting (or standby) seems believable.

    FYI, Mrs seflbuilt is going to test this light out for me on her evening walking group walks. My preliminary impression is that the beam pattern and continuously-variable control ring would do well for this purpose, but I will wait for the expect assessment.

    ----

    IFE2 was provided by Nitecore for review.
    Last edited by selfbuilt; Yesterday at 08:46 AM.
    Round-ups: 100-yard Beamshots, 1xCR123A, and High-Output. Latest: Fenix TK15.
    Full list of all my Flashlight Reviews (now gratefully accepting donations to my battery fund!)

  2. #2
    Join Date
    Jun 2006
    Location
    Lower Left side of the Mitten
    Posts
    1,182

    Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    Excellent review there (as usual) Selfbuilt. I always love seeing our reviews and impressions line up so closely.

    Aardvark-Flashaholic in denial.

    LaymansLights.com Now on Facebook and Twitter.

  3. #3
    Join Date
    Oct 2007
    Location
    California, USA
    Posts
    84

    Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    Thanks for another one of your great reviews; they are always very informative and thorough.

    I like that there is a strobe mode and that it takes two clicks of the ring to get to it.

    One thing I noticed from the tail cap photo was that the switch looks like a white version of the McGizmo's McClicky switch. I've never seen a white one before.

  4. Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    Thank you selfbuilt - excellent as usual. I have had this light for a little over a week and really like it. It is very comfortable in the hand and the control ring is easy to use one handed. I love the adjustable range on this thing. It is soo versatile. I also measured the same approximately 12ma lowest current draw. Basically once you get to this extremely low output, lowered the brightness does not conserve any more energy ( which is perfectly fine since it will run for a loooong time).

    Efficiency seems pretty good on this light too with this fantastic UI. Nice job Nitecore.

  5. Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    excellent review, as usual.

    This light seems really interesting.
    However, somebody knows why lately manufacturers are so much concerned on "CE" logo?

  6. Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    Quote Originally Posted by Budda View Post
    However, somebody knows why lately manufacturers are so much concerned on "CE" logo?
    See here:

    http://en.wikipedia.org/wiki/CE_mark

    We see this on everything, and have done so for years thanks to the gnomes in Brussels and Strasbourg. Obviously the EU is now an important market, and they must make items compatible with both the US and the EU. It's probably easier than having two sets of items.
    ________________
    The Fungi of Southern England:
    http://www.leifgoodwin.co.uk/Fungi/Fungi.html

  7. Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    Great review Mr. Selfbuilt, as always ^_^

    pardon my ignorance but, is there any word about this light having parasitic drain?

  8. #8

    Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    Quote Originally Posted by AardvarkSagus View Post
    Excellent review there (as usual) Selfbuilt. I always love seeing our reviews and impressions line up so closely.
    Quote Originally Posted by regulator View Post
    Thank you selfbuilt - excellent as usual. I have had this light for a little over a week and really like it. It is very comfortable in the hand and the control ring is easy to use one handed. I love the adjustable range on this thing. It is soo versatile. I also measured the same approximately 12ma lowest current draw. Basically once you get to this extremely low output, lowered the brightness does not conserve any more energy ( which is perfectly fine since it will run for a loooong time). Efficiency seems pretty good on this light too with this fantastic UI. Nice job Nitecore.
    Thanks, it seems we all share similar impressions. It is a very comfortable to hold and easy to use light. I am glad to see the efficiency holds up well too.
    Quote Originally Posted by lewong View Post
    One thing I noticed from the tail cap photo was that the switch looks like a white version of the McGizmo's McClicky switch. I've never seen a white one before.
    Interesting. I had noticed the switch looked distinctive - I can't recall seeing one like that before. Feel is also a little different from typical (a bit more of a traverse, somewhat "softer"). I haven't tried a McGizmo switch to compare, though.

    Quote Originally Posted by mhelskie View Post
    pardon my ignorance but, is there any word about this light having parasitic drain?
    There is no parasitic drain so long as the tailcap switch is clicked off (or the tailcap is loosened for lock-out). However, there is a drain in the "standby" mode of the ring, (i.e. the detent between strobe and the lowest output). I measured this current as 11mA, the same as the lowest output current. That means you get about a week before you drain a fully charged battery/batteries.
    Round-ups: 100-yard Beamshots, 1xCR123A, and High-Output. Latest: Fenix TK15.
    Full list of all my Flashlight Reviews (now gratefully accepting donations to my battery fund!)

  9. #9

    Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    Thank for the great review. I was hesitant, but now I know I'll be spending some $$ on one of these.
    -Make it idiot proof and someone will make a better idiot
    -Never argue with a fool, they will lower you to their level and then beat you with experience.

  10. Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    Thank you for the excellent review, selfbuilt.

    Your commentary regarding the dynamic ramping of the IFE2 being superior to visually-linear/logarithmic pretty much follows my brief, one-week experience with my copy. I find it quite useful to be able to adjust low levels so precisely yet access to high levels with ease. Before I purchased mine I was worried that the ramping adjustment would be at the expense at one end of the range, but I think Nitecore did a great job balancing access to the full ramping range.

    I did have an unfortunate incident with my IFE2 last night, though it still works fine. I had my copy clipped to my pocket, with the pocket clip outside and the light body inside my pocket. When I sat down in the seat of my car, Murphy took over and the clip bent away from the body of the light. It's sprung. I can remove the screws and bend the clip back to its original angle, but I'm afraid it won't hold under anything more than very little pressure. Any one know where I can purchase a sturdier clip? I'm not worried about weight.

  11. #11

    Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    Great review as usual, Selfbuilt. I've had this light for over a month now & I just love it.
    Olight M20S S2, Lumintop TD-15X - XM-L T6, NiteCore Infilux IFE2 XP-G R5 & Innovations IlluminaTi CA1

  12. #12

    Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    Quote Originally Posted by ss355 View Post
    Your commentary regarding the dynamic ramping of the IFE2 being superior to visually-linear/logarithmic pretty much follows my brief, one-week experience with my copy. I find it quite useful to be able to adjust low levels so precisely yet access to high levels with ease. Before I purchased mine I was worried that the ramping adjustment would be at the expense at one end of the range, but I think Nitecore did a great job balancing access to the full ramping range.
    Thanks. FYI, I have just revised that section of the review with more detail and new graphs.

    To make a long story short, my review of the research literature suggests a cube root power conversion of output data better matches perceived brightness (compared to logarithmic). This presumably explains why the IFE2 (and Sunwayman V10A) do not seem perfectly visually-linear across the whole range (i.e. this is the first time I've seen logarithmic-ramping lights that can go this low). It seems to me like the currently accepted cube root transformation for perceived brightness yields a better "visually-linear" match.

    For a greater discussion than what's in my revised first post, you can see post #28 in my V10A review.

    I did have an unfortunate incident with my IFE2 last night, though it still works fine. I had my copy clipped to my pocket, with the pocket clip outside and the light body inside my pocket. When I sat down in the seat of my car, Murphy took over and the clip bent away from the body of the light. It's sprung. I can remove the screws and bend the clip back to its original angle, but I'm afraid it won't hold under anything more than very little pressure. Any one know where I can purchase a sturdier clip? I'm not worried about weight.
    Sorry to hear about your problem - but thanks for sharing it with us. The clip does seem to be a weak point here, as I could see it might get bent fairly easily. Hopefully someone can put you on to a good replacement option! Maybe contact your dealer for a replacement clip in the meantime?
    Round-ups: 100-yard Beamshots, 1xCR123A, and High-Output. Latest: Fenix TK15.
    Full list of all my Flashlight Reviews (now gratefully accepting donations to my battery fund!)

  13. Default Re: Nitecore IFE2 (1x18650, XP-G R5, Continuously-Variable) Review: RUNTIMES, BEAMSHO

    Thanks for the excellent review, selfbuilt. This light has a very appealing feature set, though it's possibly less-than-tanklike construction and the perhaps less-than-sturdy switch (shades of the old NDI switches?) make me a bit hesitant, as I tend despite my best efforts, to beat the c--p out of stuff.

    The magnetic adjustment ring, the incredibly low lows, the strobe out of the way, but quicly accessible (unlike the NDI) and the forward clicky is great. It also has a similar form factor to the JetBeam Jet III Pro ST, which is qute comfortable and useful.

    I must confess, I don't get the clip. I thought the clip offered for the EX10 was great. It was very strong, had no sharp edges, did not appear to be 'springable' and looked good. This clip, unfortunately, appears to be an afterthought. NiteCore should just make a longer EX10-type clip, have it rest on of the body flats (as aardvark saga pointed out in his review, IIRC, it rests on one of the 'points' which will make short work of clothing) and be done with it.

    Having two NDIs and a Jet III Pro ST and being happy with them, though, I'd be very interested to try this ligth if and when NiteCore decides to offer it with a neutral tinted emitter.
    If we could get everyone in the world to close their eyes and imagine world peace for an hour, think about how serene it would be until the looting started. -Unknown

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts