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Thread: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

  1. #1

    Thumbs up Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Warning: pic heavy, as usual.




    Spark is a relatively new manufacturer, best known for their relatively floody headlamps (with direct support for Li-ions), and more recently handhelds. In this review, I will be examining their current 1xAA/14500 headlamp, with a Neutral White emitter (ST5-190NW). Please see my SL6 review for a handheld comparison.

    Manufacturer Specifications:
    • LED: Cree XML cool white T6
    • 5 constant output modes
    • Super: 220lm 0.9hours
    • Max: 120lm 1.8 hours
    • Med2: 36lm 8 hours
    • Med1: 10lm 30 hours
    • Low: 2lm 86 hours
    • Battery: One 14500 rechargeable Li battery or AA battery with range from 1.0V to 4.2V (Battery not included)
    • Electrically conductive aluminum body provides inherent EMI/RFI shielding
    • SCHOTT ultra clear lens with anti-reflection coatings on both sides
    • Reverse polarity protected
    • IPX8 waterproof
    • Weight: Without battery: 40g, With battery and headband: 105g
    • Dimensions: Length: 52mm, Width: 48mm
    • Premium grade aluminum alloy machined body with hard anodized finishing
    • Impact resistance Lens with 98% transparency
    • Operation:
    • Single click on switch to turn the headlamp on & off.
    • Hold on button to go through Minimum, Medium 1& Medium 2, Max modes. When desire mode is reached, release to stop brightness ramping and current mode is memorized. (AA with short term memorization, 14500 with permanent memorization)
    • At any mode, quick double click on button to trigger the Super mode.
    • MSRP: ~$75





    Inside the soft cardboard packaging box (with cut-out foam insert) you fill find the light, head-strap with soft rubber attachment point for the light, spare o-rings, frosted glass diffuser, and manual.

    The headband is good quality, and includes an over-the-top-of-the-head strap (which you could remove if you didn't want).



    I like the commitment to supporting recycling.



    From left to right: Duracell AA alkaline, Spark ST5, Zebralight H31, ITP H01, Duracell AAA alkaline, Petzel Tikka XP2.

    All weights with no batteries.

    Spark ST5 (1xAA): Weight, 41.5g, Length 58.4mm, Width 42.8mm (max body), Width 24.0mm (bezel)
    ITP H01 (1xAAA): Weight: 22.7g, Length 53.7mm, Width 37.2 (max body) or 15.4mm (bezel)
    Petzl Tikka XP2 (3xAAA): Weight 52.3g
    Zebralight H31w (1xCR123A): Weight: 28.6g, Length 66.9mm, Width (bezel) 22.1mm.

    The ST5 is quite small for a 1xAA-sized headlight.






    The build of the Spark ST5 headlamp is distinctive, but still familiar looking. The protruding forward head does make it a bit easier to locate the button. The headband is good quality, and worked well in my testing. It holds the light securely (both within the holder, and strapped to your head), but still allows for accurate positioning.

    I like the muted gray natural anodizing (manufacturer claims hard anodized). There are some ridges in the anodizing on my sample, but the overall effect is still good (think naturally-weathered looking). Anodizing does seem fairly thinly coated, however.

    Labels are fairly minimal and small, but clearly legible against the background.

    There is only knurling on the end pieces, once of which opens up to allow you to insert the AA battery. Screw threads are anodized for tailcap lock-out.

    There was often a brief full-power pre-flash upon connection of the battery cap with the body and battery on my sample.

    The switch is an electronic switch, with a typical traverse (although there is a clear soft click when making contact). Feel is similar to other Spark or Zebralight electronic switches.

    Light can't really "tailstand" as such, but with a battery installed there is enough of a counter-balance to let you stand it up on its flat edges.

    I like the included frosted glass diffuser (feels like glass, not plastic). This can be used to replace the clear lens, but I find it also fits over the existing lens assembly if you don't want to open everything up (i.e. just unscrew the bezel and pop on top). Note the bezel ring doesn't screw down all the way with both lenses in place, of course.





    The ST5 has a shallow reflector (light OP coating), which – when coupled with the XM-L emitter – suggests the light will not be a great thrower. XM-L emitter was well centered on my sample.

    Which brings me to the white-wall beamshots. Unless otherwise identified, all lights are on max output on 1x Sanyo Eneloop NiMH, about ~0.75 meter from a white wall (with the camera ~1.25 meters back from the wall). For 14500, I used an AW protected cell. "Daylight" white balance used on my Canon S5, to better show tint differences of my Neutral White emitters. All beamshots taken immediately upon activation.

    Let's start with un-diffused white beams:












    As expected, the default Spark ST5 produced a nice beam, with a fairly broad hotspot that wasn't overly throwy. Even without a diffuser, I found this beam quite good for up-close work (i.e. better than the XP-E-equipped lights). Note that although the original Petzl Tikka XP had an optic that produce a nice focused beam, the XP-E-equipped Tikka XP2 is rather ringy in comparison (especially on the periphery).

    Here are some comparison shots with diffusers in place:







    User Interface

    The Spark ST5 has a similar user interface to other Spark lights (which are in turn similar to the Zebralights).

    A quick click-release of the switch activates the light.

    On all batteries, there are four modes which can be accessed sequentially by holding down the switch (and letting go when the mode you want is reached). These are Lo – Med1 – Med2 – Hi, in repeating sequence.

    On 3.7V 14500 Li-ion, there is a fifth constant output mode called Super Hi. This is accessed by double-clicking the switch in any mode.

    There are no strobe/SOS modes on the ST5.

    The ST5 has mode memory, and remembers the last level used when re-activating the light. Unlike the SL6, this memory is retained for a few minutes, even if you unscrew the tailcap (i.e. ST5 recalls the last setting after a battery change). The ST5 manual claims this only happens on 14500, but I found it occurred on NiMH as well. But note the effect is short-lived. On NiMH, the memory on lasts for 2-3 mins after disconnecting the cap. On 14500, it lasts for somewhere between 6 and 10 mins (I haven't bothered trying to narrow the time further).

    Like the SL6, there is a timing quirk when turning on – you need to be quick on the press to activate the light. If you hold the switch for too long before releasing (i.e., half a second, as you might on a standard clicky), the light turns on and shuts off immediately. This is apparently an intentional (but undocumented) design feature, to allow for momentary signaling. While it works for this purpose, it is a bit tricky, as you need to get the timings just right (i.e. quick release for sustained on, longer hold before release for momentary on-off, and an even longer hold for ramping).

    PWM/Strobe

    Like the SL6, the output modes on the ST5 current-controlled. At the lower levels (Lo, Med1), I detected high frequency noise:

    Med1:


    Lo:


    On the related SL6, I saw a lot of similar high frequency noise on these levels. HKJ believes the SL6 is still current-regulated at the Lo/Med1 levels - but given the difficulties in providing high current regulation at a low current, the circuit overcompensates and produce a lot of high-frequency noise.

    Presumably the same is happening here, even though it looks like this noise has a re-occuring pattern around ~14kHz on Med1 and ~6kHz on Lo. But Spark confirms the lights don't use PWM, so it seems HKJ's conclusions are correct. In any case, this noise is completely undetectable by eye - you will not be able to observe any flickering on the lower outputs on the ST5.

    There are no strobe/SOS modes on the ST5.

    Standby Current Drain

    Due to the electronic switch nature of the light, the ST5 has a constant parasitic stand-by current drain when the tailcap is connected. Unlike the SL6 (where the dual-switch design prevents an accurate reading), I was able to measure my ST5 standby drain at 13.2uA on NiMH and 41.6uA on 14500. That translates into over 17 years on a standard 2000mAh NiMH, and over 2 years on 750mAh 14500.

    As always, this current can be cut by simply unscrewing the tailcap a quarter turn when the light is not in use (which I recommend for all lights with a standby drain). Unlike the SL6, last output memory is maintained on the ST5 even after disconnecting the battery.

    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.

    First, a comparison to my other headlamps:



    And now, other 1xAA lights:





    Consistent with its role as a small-mass headlamp, the ST5 is not as bright on max settings as larger handheld XM-L lights, on either battery type. But it is very bright by headlamp standards. The beam is not as throwy as some XP-E-based lights, but that actually suits my general headlamp purposes better anyway.

    Output/Runtime Comparison:











    Output/runtime efficiency is exactly what you would expect for a good current-controlled XM-L light driven to these levels.

    Potential Issues

    Switch timing takes a little getting used. Standard length click-release is "momentary mode", causing the light turn on/off for signalling. You need to be quick on the release for sustained on, or hold longer to activate the ramp.

    Need to unscrew the bezel to swap or add the diffuser.

    High output pre-flash often seen when connecting the tailcap to the battery/body tube.

    Preliminary Observations

    I like a nice headlight, and the Spark ST5 performs well in this regard. The ergonomics are good, and the light (and headstrap) are easy to access and use.

    In the interest of full disclosure, my usual go-to headlamp is a four-year Petzl Tikka XP that I long ago modded from a Lux to an SSC (gives a good beam with decent burst mode, and has optional colored diffusers). If I know I won't need the diffuser, I usually grab the neutral-tinted Zebralight H31w instead. Both lights are good, but neither is perfect in my view.

    I had the opportunity to test the ST5 out in some home plumbing repairs, and it worked great (typically used Med1 the most, but Lo and Med2 also saw some action). Thanks to the larger die XM-L emitter, I found the beam to have a larger hotspot than the XP-E headlamps (which are fine, but XP-E is not my preferred emitter choice in this venue). As a result, I didn't really feel the need to use the diffuser on the ST5 (something I often go for in close quarters on other headlamps).

    The overall switch feel, UI and circuit functioning is reminiscent of the Zebralight lights, but with some specific differences in shortcuts and timings. I imagine it would be a tough choice between the ST5 and an equivalent model Zebralight. One point in the ST5's favour is the symmetrical design with direct centre beam and button. This saves potentially awkward reaching with the wrong hand on the lateralized Zebralight (i.e. emitter is at one end). May not be an issue for you, but I'm somewhat ambidextrous for most tasks, so it's a 50:50 chance which hand reaches up to feel for the button. Similar issue with the buttons on the old Tikka XP – I favour a single center button whenever possible.

    My only concern with center-beam lights is how far forward they face (i.e. I don't want reflections picked up by my glasses, or too much of a spotbeam-effect up close). I've found a bit of the spotbeam effect with the ITP H01, but that’s likely due to the smaller head and XP-E emitter. No issues with the ST5 so far.

    Performance-wise, the ST5 has excellent runtimes for the output, as expected on a current-controlled light. Whatever the source of high frequency noise on the lowest modes, it is not visible by eye (I am sensitive to PWM-like flicker, and there is no sign of it here). The ST5 was a pleasure to use at all output levels.

    Unless I need red light, for the next little while I'm going to stick with the ST5 for my headlamp needs. I'll post back any updated findings as I have them.

    ----

    Spark ST5 190NW provided by Spark for review.
    Last edited by selfbuilt; 07-23-2011 at 11:49 AM.
    Full list of all my reviews: flashlightreviews.ca. Outdoor 100-yard Beamshots 2011. Latest: Jetbeam RRT26.
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  2. #2
    gunga's Avatar
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    Default

    Excellent review selfbuilt. Can you comment on the level spacing with eneloops? On my spark, high is barely higher than med 2. When the batteries are slightly used they are the same. Also, no super mode on nimh.

    Also you state xpg in your review a few times, instead of XML.

    And also, I think the mode memory resets after 3 minutes using eneloops (with some pre-flash). Do you get that at all?

  3. #3
    Flashaholic* nanotech17's Avatar
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    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Hello Selfbuilt,
    nice review as always
    can you confirm the lens on the spark by comparing it with the lens on the zebralight?
    is it ok for you to post some photos comparison?
    Thanks.



  4. #4

    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by gunga View Post
    Excellent review selfbuilt. Can you comment on the level spacing with eneloops? On my spark, high is barely higher than med 2. When the batteries are slightly used they are the same. Also, no super mode on nimh.
    That's quite different from mine, where the spacing is good and consistent across battery sources.

    As you say, no Super Hi on NiMH. But I would estimate lumens as 120, 40, 10, 2 (Hi, Med2, Med1, Lo) on NiMH, and 280, 120, 40, 15, 4 (Super Hi, Hi, Med2, Med1, Lo) on 14500. Basically, they have kept the 4 basic levels the same (and well spaced), and added the Super Hi on 14500.

    Also you state xpg in your review a few times, instead of XML.
    Thanks, fixed.

    And also, I think the mode memory resets after 3 minutes using eneloops (with some pre-flash). Do you get that at all?
    Hmm, haven't tested longer time periods and a few secs. I'll give it a try and report back.

    Quote Originally Posted by nanotech17 View Post
    can you confirm the lens on the spark by comparing it with the lens on the zebralight?
    is it ok for you to post some photos comparison?
    Sorry, don't understand how you want me to compare? I haven't tried to remove a lens on the zebralights. You can see a close up of the zebralights in my individual reviews of those lights.

    Did you want head-on comparisons of the emitters and reflectors? But I don't have a XM-L-based Zebralight to compare (only the XP-G and XP-E ones).
    Last edited by selfbuilt; 07-20-2011 at 07:15 PM.
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  5. #5
    Flashaholic* nanotech17's Avatar
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    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    hi selfbuilt,
    actually i wanted to see the difference on those 2 lens only (i wanted to see the blue hue reflection on those 2 )

    thanks



  6. #6

    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by nanotech17 View Post
    actually i wanted to see the difference on those 2 lens only (i wanted to see the blue hue reflection on those 2 )
    Ah, I can't really see a tint or hue on either (I presume you are referring to an anti-glare coating?). It's a hard thing to photograph even if you can see it. Both makers lenses seem very clear to me.
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  7. #7
    Flashaholic* nanotech17's Avatar
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    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by selfbuilt View Post
    Ah, I can't really see a tint or hue on either (I presume you are referring to an anti-glare coating?). It's a hard thing to photograph even if you can see it. Both makers lenses seem very clear to me.
    thanks selfbuilt



  8. #8

    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Awesome Review!

    I just got my Spark ST6-460NW today and I love it. The tint is great and I like the Center Located switch!
    I will try it out tonight..

  9. #9

    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    FYI, Spark confirms that their lights are current-controlled at all levels. In any case, the high frequency noise on Lo/Med1 it is not a concern - you will not be able to see it with the naked eye.
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  10. #10

    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by gunga View Post
    And also, I think the mode memory resets after 3 minutes using eneloops (with some pre-flash). Do you get that at all?
    I've done a few tests, and the light resets on both Eneloop and 14500 - it just takes varying amounts of time.

    On Eneloop, the memory is retained for at 2 mins, but less than 3 mins, once you disconnect the cap. On 14500, memory lasts for at least 6 mins but not as long as 10 mins.
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  11. #11
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    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Just received my Spark ST5 190NW.
    I think that the memorization probably don't work on mine.
    I use only Eneloop for now and i can see that the headlamp don't hold the last mode.
    I didn't measured the time exactly between the ON's, but i believe that is no more than 2 mins that it can hold the last mode.
    Of course i don't remove the battery cap in the between time.
    Just close the light.
    Also i figure out that in mine when i double click i have the 5th mode (super Hi) but just a bit brighter from the previews mode.
    Am i doing something wrong here?
    Flashy way of life...

  12. #12

    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by garbman View Post
    I use only Eneloop for now and i can see that the headlamp don't hold the last mode.
    I didn't measured the time exactly between the ON's, but i believe that is no more than 2 mins that it can hold the last mode.
    There is probably some variability in how long it remembers (from sample to sample). But I note the manual says that NiMH isn't remembered at all (only 14500), so it could just be my sample that is different from typical.

    As you say, don't unscrew the tailcap if it matters to you. Personally, I'm ok with the light coming on Lo everytime (when stored locked out).

    Also i figure out that in mine when i double click i have the 5th mode (super Hi) but just a bit brighter from the previews mode.
    Am i doing something wrong here?
    No, that's perfectly normal - there is no "Super Hi" on eneloop, output is exactly the same as regular Hi in my testing. Basically, you need to use 14500 to unlock the "Super Hi" mode.
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  13. #13
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    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Thanks for the instant post selfbuilt.
    In reality i don't bother at all about the 5th super extra bright mode but i really miss the memorization opportunity.
    As i have read in the manual on AA it has "short term memorization"
    I just don't believe that in reality it is that short without removing the tailcap of course.
    Flashy way of life...

  14. #14

    Thumbs down Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by garbman View Post
    Thanks for the instant post selfbuilt.
    In reality i don't bother at all about the 5th super extra bright mode but i really miss the memorization opportunity.
    As i have read in the manual on AA it has "short term memorization"
    I just don't believe that in reality it is that short without removing the tailcap of course.
    Maybe the mcu of ST5 190NW does not have EEPROM,Parameters remains in ram.

  15. #15
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    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Thanks Selfbuilt for another great review!

    I have just a question regarding the brightness modes. At the specs of the light I can read:

    • Super: 190lm 0.9hours
    • Max: 120lm 1.8 hours
    • Med2: 36lm 8 hours
    • Med1: 10lm 30 hours
    • Low: 2lm 86 hours

    But at your output/runtime comparisons you call them Hi and Med. I understand your Hi is Super at the specs, and your Med is Med2?
    Last edited by Swedpat; 08-26-2011 at 03:09 AM.
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  16. #16

    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by Swedpat View Post
    But at your output/runtime comparisons you call them Hi and Med. I understand your Hi is Super at the specs, and your Med is Med2?
    No, in my runtimes I label Super Hi for "Super", Hi for "Max", Med2 for "Med2", Med for "Med1" and Lo for "Low". On standard batteries, there is no difference between "Super" and "Max" - output is the same, so I've just labelled them as Hi.

    It doesn't make any sense to me to label a mode "max" when there is a higher level above it.
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  17. #17
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    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Ok, thanks!

    I now consider to get this headlamp instead of Zebralight H51W. Less complex and the design is nicer. I read there is some issue with the memory and a preflash but I can live with it, don't really need memory.
    Last edited by Swedpat; 08-26-2011 at 09:13 AM.
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    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by Swedpat View Post
    Ok, thanks!

    I now consider to get this headlamp instead of Zebralight H51W. Less complex and the design is nicer. I read there is some issue with the memory and a preflash but I can live with it, don't really need memory.
    Hmmm... this graph from his review kinda bugs me though... (look at the bright green line compared to light purple line):

    Quote Originally Posted by selfbuilt View Post
    [----

    The Spark has less output for a much shorter time, that doesnt look good to me unless it was a fluke. it was more on par with the other tests but this one which might be a level I'd be more apt to use, looks quite poor for the spark. The ZL even outperforms the XM-L Neutron by a noticable amount (brighter & longer both). And on the next level down the spark looks only a couple percent brighter but the zebralight bests it by a couply hours!
    Last edited by DIΩDΣ; 09-01-2011 at 03:12 PM.

  19. #19
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    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by DIΩDΣ View Post
    Hmmm... this graph from his review kinda bugs me though... (look at the bright green line compared to light purple line):

    The Spark has less output for a much shorter time, that doesnt look good to me unless it was a fluke. it was more on par with the other tests but this one which might be a level I'd be more apt to use, looks quite poor for the spark. The ZL even outperforms the XM-L Neutron by a noticable amount (brighter & longer both). And on the next level down the spark looks only a couple percent brighter but the zebralight bests it by a couply hours!

    Thanks for the comment! Yes, that seems correct.... It's a significant difference...
    I like the design of Spark better and also the more simple UI, but Zebralights are great lights as well...
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  20. #20
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    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    Quote Originally Posted by Swedpat View Post
    Thanks for the comment! Yes, that seems correct.... It's a significant difference...
    I like the design of Spark better and also the more simple UI, but Zebralights are great lights as well...
    Yeah I agree about the design, the spark looks a bit nicer and more like a headlamp. However the ZL looks atypical I beleive because it is - more unique - innovative. I think the ZL design allows it to be very usefull as a flashlight & EDC where the Spark would be more suited to just being a HL, not necessarily a bad thing just depends on what your after. One feature on the Spark I wish ZL had was the interchangeable lenses. That is a nice feature. I really like the Sparks too especially the more powerful 18650 ones but wanted to stick to AA and something better at EDC. As far as UI thats personal preference. I just got my ZL H51W on friday, its my first ever multi-mode modern LED light. Just from the few reviews on here and GG and others I felt I already knew the UI before I ever even held a ZL in my hands. When I finally got it was a piece of cake, really like the UI.

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    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    I recently got this light; and I've noticed bit of an update from the sample in this review. In this review the 'super' mode could only be reached with 14500 batteries. With my newer st5, I believe the super mode can now also be activated using AA. This was a pleasant surprise for me! I love being able to change the lens as well.

    Only downsides I have noticed so far, is the vertical headband is too short. Also not a huge fan of this particular neutral tint (particularly when using it with the diffuser). My tint reminds me too much of the 'warm-white' CFL bulbs.
    A blog on small pocket tools, keychain gadgets and more!

    http://keychainpockets.blogspot.com/

  22. #22

    Default Re: Spark ST5 190NW Headlamp (XM-L 1xAA/14500) Review: RUNTIMES, BEAMSHOTS, and more!

    This is just unclear to me. If you do not unsrew battery cap does the st5 hold memory forever on eneloop? Same answer st6 or other spark headlampS?

    Wish the Zebras h series had memory mode. Well, guess it does partially as far as between 2 submodes but still have to scroll thru major levels each turn on near as I can tell. Thanks, superb review.

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