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Thread: L2D Q5 making noise

  1. #1
    Flashaholic* jbosman1013's Avatar
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    Default L2D Q5 making noise

    One of my co-workers wanted me to get him a nice light, so after a little discussion he decided on a L2D Q5. I received the light today from the fenix store and carefully took it from its package to give it a lube and inspection and the first thing I noticed was the head of the light was a different shade of black than the body. I was not really concerned about that but the body does look like a old one and the head looks like HAlll. once i put some batteries in and turned it on, it started making an awful high pitched noise (like a smoke detector) in turbo, strobe, and SOS, is this normal with the new ones or should it not be this loud(FYI you can hear it from over 10 feet away) I am not sure what the average current draw is on these lights but its pulling 1.56 amps on L91 energizers. On the good side the LED is fairly centered and has a Q5 with the shiny backing and a tint on par with my malkoff drop-in's but the beam is kinda floody. Please note if you are above a certian age you will not be able to hear this noise, this is not intended to offend anyone its just fact.

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    Flashaholic* jbosman1013's Avatar
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    Default Re: L2D Q5 making noise


  3. #3

    Default Re: L2D Q5 making noise

    I point you in the direction of this thread: http://www.candlepowerforums.com/vb/...d.php?t=199263

    HKJ did some measurements to quantify the sound.

  4. #4
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    Default Re: L2D Q5 making noise

    Mine makes some noise starting up, but only for a few seconds. It's most likely coming from the head, but remove the tail and bridge with some wire to see what happens- the tailcap could be the culprit.

  5. #5
    Flashaholic* half-watt's Avatar
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    Default Re: L2D Q5 making noise

    mine have never made a hi-pitched whine that could be heard over 10' away.

    were the cells fully charged or fresh, as the case may be?

    try another set of cells. can't say that i recall the behavior of the L2D when the supply voltage gets low, but i've noticed with some other lights that when the supply voltage gets low and the drive electronics have to work harder that some hi-freq whine is now heard.

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    Flashaholic* TONY M's Avatar
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    Default Re: L2D Q5 making noise

    I think that if it can be heard over 10 feet away then something is wrong.

    The anodizing on fenix models can be inconsistent, it is still all HAIII.

    Does it come with the new reverse polarity protection head?

  7. #7
    Flashaholic* jbosman1013's Avatar
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    Default Re: L2D Q5 making noise

    Quote Originally Posted by TONY M View Post
    I think that if it can be heard over 10 feet away then something is wrong.

    The anodizing on fenix models can be inconsistent, it is still all HAIII.

    Does it come with the new reverse polarity protection head?

    not sure how to tell if its a reverse polarity head but the sound is coming from the tailcap. I gave the light to my co-worker today and he was very happy minus the noise. I will contact fenix store on monday but I have a feeling they will say that it is normal Sad to see that fenix is letting this pass on QC.

  8. #8

    Default Re: L2D Q5 making noise

    Quote Originally Posted by jbosman1013 View Post
    not sure how to tell if its a reverse polarity head but the sound is coming from the tailcap. I gave the light to my co-worker today and he was very happy minus the noise. I will contact fenix store on monday but I have a feeling they will say that it is normal Sad to see that fenix is letting this pass on QC.
    this doesn't just happen with fenix lights. did you not read the link i posted above?

    basically, it's the regulation circuit that causes it -- aka the inductor. it is normal, and it's not an issue with QC.

  9. #9
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    Default Re: L2D Q5 making noise

    It's not normal to be heard from 10 feet.

    Have you tried shorting between the battery and body tube? That'll definitely eliminate the tailcap as the culprit.

    You can tell if it's a reverse polarity head because if you insert the battery the wrong way then the dimples prevent the -ve side from contacting the +ve contact. If it's not a reverse polarity head, then the battery -ve can touch the +ve contact.

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    Flashaholic* jbosman1013's Avatar
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    Default Re: L2D Q5 making noise

    I do know of this issue with other lights the same thing happens with my SF L2 on low but it is not even close to how loud the fenix is. I know its the tail cap because when I was testing the current draw with my multimeter it was not making any noise, if this is acceptable in the Qc dep. I would hate to see what else passes by. Sorry don't have the light anymore so I am unable to see if there is polarity protection.

  11. #11
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    Default Re: L2D Q5 making noise

    In that case you could ask for a new tailcap from whoever you bought it from and swap the tailcaps.

  12. #12

    Default Re: L2D Q5 making noise

    Hello all, I am new to the CPF's. I recently purchased a Fenix L2D Q5 Premium from fenix-store and right off the bat I noticed that the light made a high pitched whining noise only in strobe, SOS and turbo modes. FYI I am 20 years old, which explains why I am able to hear it. Should I buy another tailcap or try and beg fenix-store for a replacement tailcap if this is for certain the "problem part" on these series of lights.

  13. #13

    Default Re: L2D Q5 making noise

    I just tested my L2D (not Q5) and P3D (Q5) with an audio test mic and RTA. Nothing of note up to 22 khz. I also tried the zebralight on high, and got a mild tone at 2.2 khz.

    I have another L2D at work. I will check it later this week.

    Sorry, but those are the only samples that I have to check.

    edit: I am using NiMH in the L2D. There could be some battery influence.

    gerG
    Last edited by gerG; 06-22-2008 at 10:19 PM.

  14. #14

    Default Re: L2D Q5 making noise

    You mean these things actually make operational noise now?


    I think I'll stick with good ol' on/off one level lights. Something like that would drive me batty trying to enjoy an outdoor setting.

  15. #15

    Default Re: L2D Q5 making noise

    Actually it is very anoying, but it is bearable as long as it is about 2 feet away. I wish i could test mine and send in the graph of the noise.

    edit: I am also using NiMH batteries they are 2100mAh very low discharge Powerex IMEDION's
    Last edited by Fenix Freak; 06-22-2008 at 11:36 PM.

  16. #16

    Default Re: L2D Q5 making noise

    Hi all,

    I have a P3D (will reverse polarity protection) with no hissing sound at all, but I order another unit P2D Q5 that has loud hissing sound (forgot which mode, but it is not the LOW, it is mode with high brightness : Turbo, High, Strobe etc).

    I complain to the supplier, they said it is the new inductor that cause the humming sound, it is nothing wrong with it, but I cannot stand with that sound. But they said most of the P2D has hissing sound, loud or quited, so they ship me a P2d Q5 without the reverse polarity protection, so i think it is the old P2D Q5.

    So i wonder, if I reverse the polarity of the P2D, will the flashlight damage ?

  17. #17

    Default Re: L2D Q5 making noise

    I have a P2D with a Q5 and there is no sound. If there was a sound I would return it.

  18. #18
    Flashaholic* TONY M's Avatar
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    Default Re: L2D Q5 making noise

    OK, I swear it wasn't like this before but my L2D is making a hissing sound when on turbo and on strobe not . Just enough noise if the tailcap is right against my ear. Interesting...

  19. #19
    Flashaholic* Federal LG's Avatar
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    Default Re: L2D Q5 making noise

    Quote Originally Posted by passive101 View Post
    I have a P2D with a Q5 and there is no sound. If there was a sound I would return it.
    +1

    "I LOVE THE SMELL OF LITHIUM BATTERIES IN THE MORNING..." - Kilgore

  20. #20
    Flashaholic* 22hornet's Avatar
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    Default Re: L2D Q5 making noise

    It must be a LIGHT noise . So it is normal...

    Joris

  21. #21
    Flashaholic* TONY M's Avatar
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    Default Re: L2D Q5 making noise

    Quote Originally Posted by passive101 View Post
    I have a P2D with a Q5 and there is no sound. If there was a sound I would return it.
    To be honest there is very little sound and it is ONLY when in turbo and strobe modes, but I am at least 50% sure that it is not my imagination.

    Strangely enough I can get it to keep quiet if I VERY carefully and gently press the switch in - but not enough for it to jump into strobe mode.

    I took out the switch and cleaned the threads but it is still there. Weird...

  22. #22

    Default Re: L2D Q5 making noise

    Alright, I have managed to locate where the sound is coming from on my L2D Q5. When in tubo mode (easiest way to hear the sound) try pressing the button just a littlle bit, and not far enough to go into strobe mode, if you listen closely to the boot the pitch of the sound increase. This leads me to believe that the tailcap is faulty or the batteries are "whining? when as they are pushed closer to the reverse polarity protection node. Thats my theory let me know everyone thinks!

  23. #23
    *Flashaholic* HKJ's Avatar
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    Default Re: L2D Q5 making noise

    Quote Originally Posted by Fenix Freak View Post
    Alright, I have managed to locate where the sound is coming from on my L2D Q5. When in tubo mode (easiest way to hear the sound) try pressing the button just a littlle bit, and not far enough to go into strobe mode, if you listen closely to the boot the pitch of the sound increase. This leads me to believe that the tailcap is faulty or the batteries are "whining? when as they are pushed closer to the reverse polarity protection node. Thats my theory let me know everyone thinks!
    That is interesting, could something be vibrating according to the current draw?
    Have your tried without tailcap and just make a electric connection (with a piece of metal) from the battery to the tube, does the sound the go away?

  24. #24

    Default Re: L2D Q5 making noise

    K, I just tried what u suggested and it seems the sound is not coming from the tailcap at all. the sound is acually louder due to the tailcap not muffling the sound. I also called the fenix-store and they seem to think also that the sound is from the reverse polarity protection nodes on the head (along with the new design). And he also said the sound was completely harmless. So unless i can find the exact source of the problem the only thing left to do is try and find somewhere that sells a L2D Q5 head that doesn't have the reverse polarity protection. And the fenix-store doesn't sell those.

  25. #25
    Flashaholic* TONY M's Avatar
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    Default Re: L2D Q5 making noise

    Quote Originally Posted by Fenix Freak View Post
    K, I just tried what u suggested and it seems the sound is not coming from the tailcap at all. the sound is acually louder due to the tailcap not muffling the sound. I also called the fenix-store and they seem to think also that the sound is from the reverse polarity protection nodes on the head (along with the new design). And he also said the sound was completely harmless. So unless i can find the exact source of the problem the only thing left to do is try and find somewhere that sells a L2D Q5 head that doesn't have the reverse polarity protection. And the fenix-store doesn't sell those.
    My L2D is the old type without the reverse polarity head. I haven't had a chance to get to the bottom of it yet but its not a defening sound at least.

  26. #26

    Default Re: L2D Q5 making noise

    The fenix store said the sound only recently became audible with the most current version of the L2D that might be why there is no problem with yours. (the previous versions also had it, but it was barely within reach of human hearing)

  27. #27
    Flashaholic* TONY M's Avatar
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    Default Re: L2D Q5 making noise

    Quote Originally Posted by Fenix Freak View Post
    The fenix store said the sound only recently became audible with the most current version of the L2D that might be why there is no problem with yours. (the previous versions also had it, but it was barely within reach of human hearing)
    Yes, I really did have to go out of my way to hear the noise and wouldn't have found it at all if this thread didn't exist!

  28. #28
    *Flashaholic* HKJ's Avatar
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    Default Re: L2D Q5 making noise

    Quote Originally Posted by Fenix Freak View Post
    The fenix store said the sound only recently became audible with the most current version of the L2D that might be why there is no problem with yours. (the previous versions also had it, but it was barely within reach of human hearing)
    The "sound" from the current regulators switching is way outside the human hearing. I did some measurements here:
    http://www.candlepowerforums.com/vb/...1&postcount=35

    The sound may be from the regulation, i.e. adjustment process to keep the current at the selected level. This in itself can not give any sound, but it can affect the inductor or some other metal inside the flashlight.

  29. #29

    Default Re: L2D Q5 making noise

    FWIW, I have to good hearing, and hear nothing in any mode with light next to my ear, but it's a newly purchased L2D Premium Rebel model.

  30. #30

    Default Re: L2D Q5 making noise

    Quote Originally Posted by HKJ View Post
    The "sound" from the current regulators switching is way outside the human hearing. I did some measurements here:
    http://www.candlepowerforums.com/vb/...1&postcount=35

    The sound may be from the regulation, i.e. adjustment process to keep the current at the selected level. This in itself can not give any sound, but it can affect the inductor or some other metal inside the flashlight.
    Very true, i am familar with your tests from the previous threads about this problem which seems to have aswered many questions. You are probably correct as to what is causing this problem which leads me to believe that the L2D Q5 without reverse polarity protection which has no known noise problem existing (it is there but not near as loud) is worth buying to test out if I can find one that is.

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