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Thread: Fenix P2D CE Problem on Low Setting (Video)

  1. #1

    Default Fenix P2D CE Problem on Low Setting (Video)

    On my first Fenix P2D CE, the medium setting would not work. Josh at Lighthound graciously sent me a replacement.

    However, on this second P2D CE, when using the low-medium-high-SOS levels, the low setting starts out at full power for about a quarter second before settling down to the low output. This doesn't seem right to me and seems to defeat the purpose of starting out with a level that is not too bright. Josh is looking into it for me, but I thought I'd poll owners here, too.

    I shot some video so you could see what I'm talking about: http://home.vafb.net/~rgknowlton/P2D_CE.wmv.

    I suppose I just want a $50 light to work the way it's supposed to. Has anyone else experienced this issue?

  2. #2
    Flashaholic* Lite_me's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Yes, it's so common you can say they all do it. I have one and mine does it. It has been discussed in various threads.
    Here's one. Click here...
    Last edited by Lite_me; 07-11-2007 at 03:59 AM.
    "Success usually comes to those who are too busy to be looking for it."

  3. #3
    Flashaholic fluke's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    My P3DCE does it, my L2DCE does it.
    Seems to be one of those things.
    Surefire 6PLED (Dereelight Q5 Drop-in) - Regalight WT1 - P3DCE (datiLED Q5ed) - L1D Q5 - L0DCE - LiteFlux LF2 - Minimag Niteize 3 LED Drop In And Clickie Tailcap - Mag 4d

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    Flashaholic* digitaleos's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    My P2D does it, but my P3D does not .

    Chris
    U2A--D10--Stanley HID

  5. #5

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Likely just a by product of the way they have designed the regulator. I don't like it, but it is not the end of the world. I guess we need to keep our hand over the light for that first flash.

    Semiman

  6. #6

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    The P1D does it also. It is much less noticeable in the P1D because it goes from high to medium instead of from high to low.

  7. #7
    Flashaholic RV7's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    This can be easily fixed by software. I'm surprised to see Fenix overlooked this issue during R&D. Hope they've already noticed and fixed it.

  8. #8

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    I got my P3D about a month ago and mine does not have this problem, maybe I just got lucky

  9. #9

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Quote Originally Posted by digitaleos View Post
    My P2D does it, but my P3D does not .

    Chris
    Quote Originally Posted by jeremyison05 View Post
    I got my P3D about a month ago and mine does not have this problem, maybe I just got lucky
    P3D is a different driver. It is a buck driver, while the L1D, L2D, P2D (and possibly the P1D) all have the same boost driver. This seems to only effect the one type of circuit board...not the others, so it's not surprising that your P3D doesn't have the same issue. Although, I am surprised by the one poster who has had the problem with his P3D - I have not heard of that so far.

  10. #10
    Flashaholic* Lite_me's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Quote Originally Posted by RV7 View Post
    This can be easily fixed by software. I'm surprised to see Fenix overlooked this issue during R&D. Hope they've already noticed and fixed it.
    Maybe we can flash it!
    Last edited by Lite_me; 07-27-2007 at 01:02 AM.
    "Success usually comes to those who are too busy to be looking for it."

  11. #11

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Damn I just ordered a P2DCE as well....but hey what if we look at it a different way.....just think if u ever have to flash your light in a defensive situation to hopefully gain precious moments of a second, even if its in low mode youre still gonna get that full blast, or a little of it anyway......yes?

    no?

  12. #12
    Flashaholic* Outdoors Fanatic's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Chinise Quality Control...

  13. #13
    Flashaholic* bondr006's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    My P2D and L1D do it, but my L2D and P3D do not.

    BTW Outdoors Fanatic, I don't appreciate the crack about the Chinese. My wife is Chinese. She came here to America, worked very hard on her education in Electronic Engineering all the way up to her Doctorate, and now she is an Senior Electronic Engineer at Texas Instruments. She worked very hard to get to her position and is very conscientious about the quality of her work....Most times even more so than her American colleagues.

    You can find poor manufacturing and quality control easily enough in the United States and Europe also. To make a broad statement like that about the Chinese is unfair and uncalled for.
    Last edited by bondr006; 07-12-2007 at 11:57 AM.
    Rob Bond - My Lights - Needs some serious Updating

  14. #14

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Quote Originally Posted by RV7 View Post
    This can be easily fixed by software. I'm surprised to see Fenix overlooked this issue during R&D. Hope they've already noticed and fixed it.

    Software?

  15. #15
    Flashaholic RV7's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    I'm not a Fenix engineer so I'm not 100% sure, but very probably it's either the initialization of the software taking too long, or energy build up in the driver. Both can be fixed by some software tricks. My own board had the same problem and was fixed thru software.

    btw I second bondr006. If we can't keep peace here on CPF, I see no hope in world peace.

  16. #16
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Sounds more it might be like a processor reset/control issue (processor must come out of reset and run the light right from power on press of the switch--power on / reset issues in computers is not a trivial issue to resolve--there is also that less than 2 second period where interrupted power is used to switch modes)--and those could be just as easily a hardware "issue" as a software issue...

    But without code, schematics, and such--can't tell much from here.

    -Bill

  17. #17

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    I have a 'plain' p2d and then i got a newer 'q2' edition p2d, the plain one doesnt flash, the 'q2' version flashes when changing modes as well as doesn't have a low mode on either a new primary cr123 or a 3.0v rechargable cr123 (low and medium are the same)... needless to say, the q2 sits on my shelf and doesn't get used much, the plain one i carry every day...

  18. #18
    Flashaholic* abvidledUK's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    I think the only way round is a "soft start" to power up, I prefer instant light, albeit with a flash, than having to wait for circuitry to compensate. Unless it is msecs.

    I have sort of got into the habit of pressing P2D head against body, this helps in one handed switch on anyway.

    Quote Originally Posted by bondr006 View Post
    BTW Outdoors Fanatic, I don't appreciate the crack about the Chinese.
    You can find poor manufacturing and quality control easily enough in the United States and Europe also. To make a broad statement like that about the Chinese is unfair and uncalled for.
    I totally agree.

    Quote Originally Posted by Outdoors Fanatic View Post
    Chinise Quality Control...
    (No comment needed ?)
    Last edited by abvidledUK; 07-13-2007 at 09:08 AM.
    Batteries, batteries, I need more batteries ........

  19. #19
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    For $50.00 the light should work as led to believe in their advertising and spec sheets. Nowhere on any advertising or specs for the light does it say that it will flash when starting up. This sounds like a big glitch and quality control issue to me and it should be remedied.

  20. #20
    Flashaholic* abvidledUK's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    It's not the only torch that does that, or something similar.

    The Safe-light Superbright gives a double flash when using the constant press to switch off.

    Now, I find that more intrusive.
    Batteries, batteries, I need more batteries ........

  21. #21

    Wink2 Re: Fenix P2D CE Problem on Low Setting (Video)

    Quote Originally Posted by Uncle Bob View Post
    For $50.00 the light should work as led to believe in their advertising and spec sheets. Nowhere on any advertising or specs for the light does it say that it will flash when starting up. This sounds like a big glitch and quality control issue to me and it should be remedied.
    I think we can all agree that the flash issue before low is a problem. I can only assume as the lights get better they will fix this issue. They may have upgraded the circuitry to a more efficient circuit recently, hence the new problems. I also am slightly bothered by the flash, but I just put my other hand over the lens (or press the lens against my shirt) to prevent the flash. I mostly use this light in high or turbo mode anyway - so it doesn't seem like a huge problem in my eyes. The low, is too bright IMO (especially with my Cree Q4 bin) - but hopefully with new driver revisions they will give us a lower low, along with eliminating the flash. I have the L1D and L2D bodies already - and will get the P2D body within a week to complete my boost Fenix lego set.

    Overall though, I haven't had a light which performs up to the same standards for as inexpensive as this light is - $50 for a light which has 4 brightness settings (+ SOS and strobe), and can use a variety of different bodies and battery sources still seems like an excellent value in my eyes. I have one light which I have been playing with and modifying over the last couple of years with much more invested, and the Fenix light is brighter and out throws that light...hence why I am again upgrading my old light to another new driver and emitter. But this light can only use 2xAA NiMH, and it only has a single setting - so it's not anywhere near as versatile as my Fenix P2D/LxD lego set.

    Still love the Fenix, even with the flash problem. Uncle Bob, are you considering selling your P2D due to the problems? If so, I could take it off your hands and keep the body, upgrade the emitter in the head, and resell it. Just let me know through PM.

  22. #22
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Quote Originally Posted by wintermute View Post
    I think we can all agree that the flash issue before low is a problem.
    Speak for yourself. It doesn't bother me in the slightest.

  23. #23

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Quote Originally Posted by Jay R View Post
    Speak for yourself. It doesn't bother me in the slightest.
    I've already stated it doesn't bother me either, but it's obviously an incorrect way for a driver to start-up. Like RV7 already indicated, this was a problem with his drivers...one that he fixed. It's a minor flaw in the operation of the circuit (especially since earlier models did not exhibit the problem).

  24. #24

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    For me it is not that big a deal. I don't want them to give up any efficiency to stop it. There is not a more efficient flashlight available at any price.

  25. #25

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Quote Originally Posted by Art Vandelay View Post
    For me it is not that big a deal. I don't want them to give up any efficiency to stop it. There is not a more efficient flashlight available at any price.
    They wouldn't have to give up any efficiency to fix this. RV7 can probably comment more on this, since he had the same problem in the drivers he is building at one point - but is now fixed. His thread is here - and you can see some 3-D models of his new circuit here.

    If you want to see what these LxD/P2D drivers look like, look at my thread here. I'm not sure if anyone has deduced how the light switches from the 'Low, Med, High, SOS' mode to the 'Turbo, Strobe' mode - but I think I've figured that out as well. On another plus side - if they would get rid of the strobe mode, then the bezel could be switched to Turbo and a forward-clicky momentary could be used!

  26. #26

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Here's the response received from Fenix:

    "It is normal like that. The circuit releases 100% output of the max brightness when you open it or change a mode. It is checking when you change to a new mode, so it needs about one second to go to the mode you want."

    I don't like it, but it appears to be an expected response.

  27. #27

    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    From what I have heard from other members, the P3D does not do this - but considering it is a different driver this doesn't completly surprise me. If anyone with one of the old smooth reflectors wants to upgrade to a new unit - or if someone wants to maybe try 2 x 14500 batteries in a L2D body with a P3D head, I am willing to buy the older/semi-working head to do some testing with. Stock heads can be bought cheap from Fenix-store $32 with the discount, so if anyone wants to try something else (especially if you have the old smooth reflector, and you want to move to the textured reflector) I'll buy the old semi-sorking/old Fenix head from you for a decent price and your out of pocket expense to pick up the new head will be minimal. Let me know...only discontinued, semi non-working Fenix heads though...I am going to do some tests which would kill my warranty quickly - but you could get a brand spanking new head from Fenix-store within days for a minimal investment. Let me know thought PM..

    All the best,
    wintermute.

  28. #28
    Flashaholic* XeRay's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Quote Originally Posted by RV7 View Post
    If we can't keep peace here on CPF, I see no hope in world peace.
    Peace on CPF is one thing, world peace is quite another. NOT gonna ever happen, only in science FICTION.

  29. #29
    Flashaholic RV7's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Quote Originally Posted by Art Vandelay View Post
    For me it is not that big a deal. I don't want them to give up any efficiency to stop it. There is not a more efficient flashlight available at any price.
    In my case, I didn't have to give up anything to fix it.

    btw, do you have any number to back up your top-efficiency claim?

  30. #30
    Flashaholic RV7's Avatar
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    Default Re: Fenix P2D CE Problem on Low Setting (Video)

    Quote Originally Posted by Bob K View Post
    Here's the response received from Fenix:

    "It is normal like that. The circuit releases 100% output of the max brightness when you open it or change a mode. It is checking when you change to a new mode, so it needs about one second to go to the mode you want."
    Does this make sense to anyone? Not to me.

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