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Thread: Kudos to Fenix on the L0D Q4 holiday special edition light

  1. #91

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Quote Originally Posted by thwang99 View Post
    Would it be possible guys to take out the spring, and put some sort of resistive element there? Even just 0.1 ohms of resistance should help protect the LED, and you wouldn't lose much brightness, or must efficiency, since the voltage is so low, right?

    - Tony
    I have thought of the same thing.

    You could tinker with the resistor values to get 400 or 500 mA of drive max.

    A major change in 10440 Lithium cell chemistry or brand might require you to recheck the current and tweak the resistor values, but it would definitely be more stable during day to day operation and would give some way to compensate for the variable Vf of the Q4.

    A pair of 1/8 watt SMT resistors could be embedded into a small circular piece of standard thickness 0.062 inch FR4 double sided PCB material, which would be cut with small rectangular openings to allow the two 1/8 SMT resistors to be embedded inside the board with one side of each resistor soldered to the top side copper foil and the other side soldered to the bottom side copper foil.

    The resistors would be selected to have slightly less thickness than the PCB material (which should be true for most 1/8 Watt SMT resistors), and would be mounted at a slight angle in the cutout opening so one end of the resistor is flush with the upper surface and the other end is flush with the lower surface. This angled mounting arrangement would help keep the side of each resistor that is not connected to it’s respective layer from shorting to the unwanted side.

    I think such a tiny disk would easily fit under the tail spring, though you might need to trim a turn or so off the spring so it's not as tight.

    The disk could also simply be dropped into the top side head between the top of the battery and the bottom of the driver board. A small solder bump could be added to the side of the disk which contacts the underside of the driver to insure good contact.

    The top position would be better for day to day swapping between battery types, but the bottom position would be simpler for full time use of 10440's and would give the resistor disk good heatsinking into the body of the light at the bottom of tube where there is not much going on to create heat which would even out the temperature distribution much better.

    To cut the current to the Q4 down to a more reasonable level the resistors would only have to dissipate less than 1/4 watt, but even this small amount of heat coupled right on the top post of the battery might make the 10440's thermal protect trip early, so the position under the tail spring is by far the safest bet.

    Personally, I would love to work all this out in more detail and post some pics, but I am quite pleased with the light level my little L0D-Q4 puts out on plain old NiMH cells and really impressed with the way it works on L92 Lithium cells, so I don't really plan to run 10440's any time soon. Sorry.

    With Slightly dimmed down 10440’s you would still probably be looking at less than 1/4 to 1/6 the runtime of L92 lithium cells and one of the things that attracted me to the L0D was it’s ‘best in class’ efficiency and runtime.

    Take a look at this image again.





    Now keep in mind that this comparison was based on actual measurements reported at FlashlightReviews.com with normal NiMH and L92 type batteries.

    Do you really need more light than a 4 D-Cell Maglight?
    Last edited by Luminescent; 12-13-2007 at 08:48 AM.

  2. #92

    Evilgrin07 Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Quote Originally Posted by chibato View Post
    Anyone know if the LOD Q4 will be available in other colors, or any rumors of a Q5 version?
    That's what I would need to hear.

    My Q5 P1D CREE blows away my SSC lights. a Q5 in the L0D could be impressive.I would want black, not the red, or if custom colors are an option what about navy blue?

  3. #93
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Well, I recently got my L0D Q4 and like it, but I compared it to a regular L0D-CE and have to say there is a very small difference if any!
    The light colour is much whiter or "bluer" if you want, so it may look a little brighter but I tested the two lights outside and there really was no big difference.
    Also the colour of my L0D Q4 is more orange than red. Well, better then pink...
    At least I like the christmas logo a lot since I'm a huge Christmas-fan!

    P.S.:
    I would really prefere a higher PWM frequency over a few percent more light!

  4. #94

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Quote Originally Posted by Ice View Post
    Well, I recently got my L0D Q4 and like it, but I compared it to a regular L0D-CE and have to say there is a very small difference if any!
    The light colour is much whiter or "bluer" if you want, so it may look a little brighter but I tested the two lights outside and there really was no big difference.
    Also the colour of my L0D Q4 is more orange than red. Well, better then pink...
    At least I like the christmas logo a lot since I'm a huge Christmas-fan!

    P.S.:
    I would really prefere a higher PWM frequency over a few percent more light!

    The original L0D-CE was spec'ed at only 50 Lumens where the new L0D-Q4 is spec'ed at 75 Lumens.

    This is enough of a difference to definitely be noticeable but it takes something like a 2 to 1 difference before it will really start to look dramatic.

    Also the Lumens spec may have been a little on the conservative side on your original L0D-CE as later P4's improved in output, and tended to fall near the top of their bin.

    In any case this is one bright little light!

    I agree 100% on the PWM frequency. My C-LE uses about 3 times higher frequency, and that does make a difference.

    With the L0D I rarely notice the PWM, but with the C-LE I NEVER notice it.

    In Europe standard fluorescent lights flicker at about 100Hz just like the L0D (they turn on and off twice in each full 50Hz AC cycle, once on the positive swing and once on the negative swing), but in the U.S.A. this would be 120Hz, which is a just bit higher than the frequency the Fenix L0D-Q4 uses for PWM so I think we are a little less able to tune it out.

    I think Fenix felt that they were on solid ground because the 100 Hz they used is higher than even ergonomic computer monitors (that only have to refresh at 75 Hz or higher), but the light output created by the PWM is choppier than a monitor, so you need a higher frequency like 300 to 1000 Hz to make the PWM really unnoticeable.

    At first I thought that this would only involve a software change in the lights processor, so was a little miffed that Fenix hasn't made the change to a higher PWM frequency yet.

    Now, as an engineer I think that I can see at least one reason that Fenix may be holding off.

    I think you can probably blame the 10440 crowd for this situation. You see the L0D was never designed for these cells, but does work after a fashion. Fenix is well aware that this is going on, and may be concerned that the change to a higher PWM frequency would result in much more stress on the PWM chopper MosFet when 10440's are used.

    They may have done some testing on this and decided to leave things as they are to avoid problems, with higher failures in the PWM circuit.

    The old V1.0 C-LE used a lower PWM frequency which was even more annoying than the L0D, but with the V1.2 and V2.0 versions, now the frequency is much higher, and I find that it is almost completly unnoticeable, but the V1.0 C-LE would work with 10440 cells and the V1.2 and V2.0 will NOT.

    Even the slight increase to 300 Hz like the C-LE uses would be a big improvement, and there are small SMT MosFET's available now which should be able to handle this higher frequency even with the higher current of a 10440.

    In any case, even if they have to do a little re-engineering on the driver, I hope that Fenix will figure out some way to bump up the PWM frequency by at least a factor of two or three, because this low frequency PWM issue keeps some folks from even considering the L0D, and they are loosing sales as a result of this.
    Last edited by Luminescent; 12-15-2007 at 11:46 AM.

  5. #95
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Wouldn't it be more likely that they are sticking with 100Hz so that they keep their place on top of the hill as runtime king?

  6. #96

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Quote Originally Posted by StandardBattery View Post
    Wouldn't it be more likely that they are sticking with 100Hz so that they keep their place on top of the hill as runtime king?
    You could be right. MosFET's can switch in nanoseconds, so even several thousand Hz PWM should not technically be a problem, but it all depends on how you drive them. Another issue is that when you chop the light drive on and off very quickly the lights boost regulator either has to respond to these changes in load or get gated on and off with the same PWM signal, and some regulator circuits don't stay stable when the load is switched too quickly.

    All this technical mumbo-jumbo aside, I agree with you 100 percent about the L0D being the most flexible light out there when it comes to offering both jaw dropping brightness in high and super long runtimes in low.

    I don't know a single other AAA light which can do 75 lumens on high and still offer as long a runtime on low, as the L0D.

    The Lumapower 'Avenger' could be a contender, but it looks like it already has a few issues, like the light doesn't really come anywhere close to 100 lumens, and some have already reported having trouble with the two position twisty level switch.

    Have to wait and see how that all turns out, but with Fenix finally starting to get a little competition in the single AAA category, we may finally be able to see some changes.

    Overall, aside from tweaking the PWM frequency and maybe driving the emitter a tad harder in high I wouldn't really change much, because the L0D is a super little light

    I would be willing to see the runtime in high go down to 45 minutes to get 100 plus lumens. This wouldn't be too bad a tradeoff, because unlike the Lumapower Avenger the L0D has a very nice MEDIUM mode which comes up by default anyway, and using a higher PWM frequency would make this medium mode and the low mode even nicer.


    Also we should mention that this PWM thing shouldn't be much of an issue with the folks who are considering a single mode light because those lights run in the equivelent of the L0D's high mode all the time, and when you put the L0D in it's highest mode there is also NO PWM.

  7. #97
    Flashaholic garence's Avatar
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    I second the Kudos to Fenix.

    The L0D Q4 is a very good buy, despite the silly bell and bow imprinting. My L0D appears much more like copper than red, which I think looks sharp (although I do like the red too on the L0P--it has that spacecraft anodized aluminum look going for it).

    Despite the PWM at the low setting, this light looks clean and bright. The center spot is bright and the spill is usable. I found the UI a little odd at first, but now that I've gotten used to it I like it. This makes a great general purpose EDC. I wouldn't lash it to a keychain though, as the anodizing feels like it will probably scrape off over time. I think I might try some heat shrink tubing on it. Can anyone suggest a good place to get some reasonably priced?

  8. #98
    Flashaholic* jbviau's Avatar
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    I know a lot of people have hesitated on this light due to its color, so maybe you all will find this interesting:

    http://www.amazon.com/L0D-CE-Q4-Prem...8186783&sr=8-4

    Yes, a black Q4 L0D-CE! I don't think it's a typo (i.e. that the red color was mistakenly not listed) because you can find this listing for a red one alongside it on Amazon:

    http://www.amazon.com/Christmas-Q4-P...8186783&sr=8-2

    Can anyone confirm? I'm finding it hard to resist buying one of these. If it were in olive, I'd pull the trigger for sure.

  9. #99
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Quote Originally Posted by jbviau View Post
    I know a lot of people have hesitated on this light due to its color, so maybe you all will find this interesting:

    http://www.amazon.com/L0D-CE-Q4-Prem...8186783&sr=8-4

    Yes, a black Q4 L0D-CE! I don't think it's a typo (i.e. that the red color was mistakenly not listed) because you can find this listing for a red one alongside it on Amazon:

    http://www.amazon.com/Christmas-Q4-P...8186783&sr=8-2

    Can anyone confirm? I'm finding it hard to resist buying one of these. If it were in olive, I'd pull the trigger for sure.

    I think its either a typo or the seller thinks that anyone looking wouldnt know better. I noticed this myself a few days ago and thought that it was exactly what im looking for. I want the 75 lumens but in black, not red. I emailed the seller and have yet to hear back from him. Also when you go to his storefront(its not directly coming from Amazon) and click on that light, it brings you to a LOD CE.

  10. #100

    Scowl DOA!!!!



    I just received two L0D Q4s via USPS First-Class mail today. I'm very upset and disappointed that one of them does not work. I've tried different batteries and it doesn't turn on. I tried calling them but they're closed for the day. Now I have to go to the post office and ship this thing back to them and then hope that they'll send one back to me. Can they ship one immediately? I bought these lights as gifts and now I'm screwed...

    I read somewhere on this forum that Fenix-Store has an active member on this forum. Who is this person?

    BTW: these lights are not red (it's not even close) contrary to what the Fenix-Store website states and illustrates. Plus, the color isn't the same between the two that I received. What kind of company is this???
    Last edited by Ducati; 12-20-2007 at 06:15 PM.

  11. #101
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    Default Re: DOA!!!!

    Where did you purchase them from? Was it one of the black LOD Q4s from Amazon?

    UOTE=Ducati;2274547]

    I just received two L0D Q4s via USPS First-Class mail. I'm very upset and disappointed that one of them does not work. I've tried different batteries and it doesn't turn on. I tried calling them but they're closed for the day. Now I have to go to the post office and ship this thing back to them and then hope that they'll send one back to me. Can they ship one immediately? I bought these lights as gifts and now I'm screwed...

    I read somewhere on this forum that Fenix-Store has an active member on this forum. Who is this person?[/QUOTE]

  12. #102
    Flashaholic* jbviau's Avatar
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light


  13. #103

    Default Re: DOA!!!!

    Quote Originally Posted by bourget117 View Post
    Where did you purchase them from? Was it one of the black LOD Q4s from Amazon?
    No, it was the "red" ones from the fenix-store website...

  14. #104

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Quote Originally Posted by jbviau View Post
    thanks! Why do they still market this light as red in color? The box is closer to red. The light is closer to orange and copper.

  15. #105

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Quote Originally Posted by Ducati View Post
    thanks! Why do they still market this light as red in color? The box is closer to red. The light is closer to orange and copper.
    Sorry you ran into trouble with the light. Give the folks at the Fenix-Store a chance and I am sure they will straighten it out for you.

    As far as the color on your two lights goes, my light was from an early shipment and it is indeed a very deep red almost burgundy color, but even with consecutive batches under pretty carefully controlled conditions you will still get some variations in all color anodizing, and these variations are much more pronounced with the thicker HAIII type finish.

    This is why most commercial firms won’t offer color on HAIII Anodizing at all.

    According to 4sevens in another thread, Fenix is shifting their Anodizing to in house production.

    My guess is that the big demand for this light has caught Fenix by surprise and they either had to do another quick batch to meet demand, or else they jobbed the anodizing out to one of their other vendors, and there were slightly greater color variations.

    In another thread I see that Fenix apparently plans to kill their ‘natural’ colored lights. I am not sure if this just applies to the T1 or if they will do this across the board.

    I for one will be REALLY REALLY REALLY UNHAPPY if Fenix doesn’t offer the L0D in ‘natural’ again after the holidays.

    Killing the L0D natural option would be a monumentally STUPID move, because the lighter ‘natural’ finish shows wear a lot less on keychain duty, but if Fenix does do this it will be because of just these kinds of complaints.

    If we bitch enough about this plan to kill the ‘natural finish’ lights, perhaps Fenix will change it’s mind on this, but on the other hand, if the only bitching they are hearing is about “color variations”, then they will simply go back to the Henry Ford Model-T color options, i.e. “you can have any color you like, as long as it’s black”.

    I know a lot of folks wouldn't mind this because they are waiting for the L0D-Q4 to be introduced in black, but for the record I have to say that, though I like my RED L0D-Q4 a lot, and have a place picked out for it which will help keep it's red finish in good shape, my next L0D will be a natural finish version (preferably a Rebel 100 or Q5) or NONE AT ALL.
    Last edited by Luminescent; 12-20-2007 at 07:01 PM.

  16. #106

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    I seem to recall that the shift to in house anodizing will eliminate the natural in favor of olive drab, which is the finish on the T1. It sounds like that finish is fairly good, so I'll be looking forward to the new light introductions in January.

  17. #107

    Default Re: DOA!!!!

    Quote Originally Posted by Ducati View Post


    I just received two L0D Q4s via USPS First-Class mail today. I'm very upset and disappointed that one of them does not work. I've tried different batteries and it doesn't turn on. I tried calling them but they're closed for the day. Now I have to go to the post office and ship this thing back to them and then hope that they'll send one back to me. Can they ship one immediately? I bought these lights as gifts and now I'm screwed...

    I read somewhere on this forum that Fenix-Store has an active member on this forum. Who is this person?

    BTW: these lights are not red (it's not even close) contrary to what the Fenix-Store website states and illustrates. Plus, the color isn't the same between the two that I received. What kind of company is this???
    I received a very quick response tonight from Fenix-Store. They will express mail two flashlights tomorrow and hopefully I'll receive it Saturday or Monday. They will even try to pick the ones that are closer to red in color. I just have to send back the original lights upon receipt of the new ones. Hopefully everything will be okay.
    Last edited by Ducati; 12-20-2007 at 10:57 PM.

  18. #108

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    I will add my kudos to this fine light. I gifted a couple to some clients and they are in love. Both are pretty non-technical but they are digging this bright little bugger. One e-mails me and says he is now an everyday carrier of the light. The other was showing his off to the office gadget geek and was overjoyed at making his colleague jealous with his own toy. He now carries it too.

    Just delivered another to a techy type client who I know is a latent flashaholic. Can't wait to hear his feedback.

    Great light. Not red though. I would have to call it coppery orangeish if anything. Cool cuz the two guys mentioned above are both alumni of my alma mater whose colors are orange and black. I attached a nice black split ring for them instead of the included silver and voila, school spirit!
    Too many lights! Stop me!

  19. #109

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    I want one L0D Q4.

    I'm ok with red / copper orange color. But I don't like the snowflakes and bells.
    Do you know if would be easy to remove those, without affecting the color?

    Thank you.

  20. #110

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    The bells etc are really tiny, you will hardly notice them in use.

  21. #111

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    I know that they must be tiny, but I'm really picky, and I'm sure I'll try to remove them. So I'm afraid of ending with a scratched flashlight, or with a red and dirty-silver one, if I use chemical products on it.

    Anyone have tried to remove it?

    Do you think that could be easy?

  22. #112
    Flashaholic* mccavazos's Avatar
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    I just got a L0D Q4 in the mail. My previous AAA Keychain light was an ARC AAA from several years ago, and all I can say is WOW. This light is fantastic. It is actually smaller than what I thought it was going to be. I was originally skeptical about the color and Christmas designs, but once I had the light in my hand, all of that skepticism went away. The color is pretty cool, more copper-orange than red, and the small designs aren't noticeable unless you are looking for them. All in all this is a great light, its hard to believed that there is such a great amount of light coming from such a small package.

    Good job Fenix!
    Q-III w/ FluPIC | X5-W | NiteIze AA MiniMag w/ Clickie Switch | PAL Light | Arc AAA (EDC) | Dorcy AAA | 2 AAA & 2AA Riverrock | Fenix L1P (EDC) | PT EOS w/ SXOH | Lumapower D-Mini |

  23. #113

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Got one for my wife and a friend got one for his. Highly recommended. Also highly recommend Energizer lithiums. pricey but worth it - much brighter.
    “Don’t ask yourself what the world needs. Ask yourself what makes you come alive, and go do that, because what the world needs is people who have come alive.” Gil Bailie

  24. #114
    Unenlightened CWR712's Avatar
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Ble,

    I think you will be largely unsucessful removing the bells. They are not printed, but engraved into the light. There has been a huge dispute here about this feature of the LOD. In actuality, they are so small, I doubt you will really even notice them (the light itself is only slightly larger than the AAA battery that drives it). The engraving is TINY.

  25. #115
    Flashaholic* Alan B's Avatar
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Get some heatshrink in your favorite color and cover the logo/bells. Red, black, purple, whatever. Increase the grip and personalize the color.

    -- Alan

  26. #116
    *Flashaholic* Burgess's Avatar
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    I can likewise recommend Energizer Lithium cells (L92) for this wonderful flashlight.


    Yes, they are a bit pricey.


    But they perform GREAT, and you only use one at a time.


    Love my Fenix L0D-CE Q2 (natural finish).

    Can only imagine what the Q4 looks like.

    _

  27. #117
    *Flashaholic* Marduke's Avatar
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Just place the included clip to cover the logo. It hides it completely.

  28. #118
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    We just got 2 delivered overnight from Fenix-store (I'm running a little late this year). Great gifts, if I can keep my hands off them.

    I think I'll put in an L92 with each.

  29. #119

    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Thank you alfablue, mccavazos, CWR712, Alan B and Marduke

    I think that I'll wait to the Q4 natural finish, or to the copper-orange non Christmas version, the first one they release.

  30. #120
    Flashaholic* jbviau's Avatar
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    Default Re: Kudos to Fenix on the L0D Q4 holiday special edition light

    Well the natural finish has been discontinued at Fenix. Maybe copper non-holiday will appear down the line, but Trevor at Fenix Store told me in an email that there definitely wouldn't be an olive q4 version of the L0D-CE. Bummer! Then again, maybe that means an even better bin will make it into this light in some color other than black!

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