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Thread: Fenix LR40R HUGE disappointment, need alternative

  1. #1
    *Flashaholic* turbodog's Avatar
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    Default Fenix LR40R HUGE disappointment, need alternative

    Just received fenix lr40r, 12,000 lumen light.

    Overall: very good

    Likes:
    dual buttons to control flood (11,000 lumens) and spot (1,000 lumens)
    long range TIGHT spot
    overall lumen output
    can take protected 18650 cells (1 to 4 of them)
    functions as usb powerpack
    waterproof

    Dislikes:
    if using the 18650 option, you lose turbo flood, limiting flood down to 6,000 lumens
    replacement packs are $90 bucks or so (when they are not made anymore... I lose 5,000 lumens)
    can't charge pack outside of light
    rubber door over usb ports, this will fail eventually

    Needs:
    long range spot
    run from loose protected 18650 cells
    LOT of output
    Last edited by turbodog; 04-01-2021 at 04:51 PM.
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  2. #2
    Flashaholic* orbital's Avatar
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    Default Re: Fenix LR40R HUGE disappointment, need alternative

    +

    Easiest post I'll ever make.

    Acebeam K30GT

    for it's smallish size, it has an incredibly deep reflector
    12v, running on three 18650 in series
    simple UI

    {if I had only a few seconds to think about it, my vote for the best light to date}

  3. #3

    Default Re: Fenix LR40R HUGE disappointment, need alternative

    I wonder if there is a way to figure out the amp rating of the individual batteries in the battery pack. Some of my flashlights, including my Acebeams state that they require batteries with a minimum of "x" continuous amp discharge rates. For example, my x10 came with a 30A rated battery, while my L35 came with a 20A rated battery.

  4. #4
    *Flashaholic* turbodog's Avatar
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    Default Re: Fenix LR40R HUGE disappointment, need alternative

    After some thought I think I know why it disables turbo flood mode when using loose 18650 cells. In the current design, with loose cells, there's not a way to tell how many are present. If you were to load a single cell highly enough you could damage the cell and cause a hazardous situation.

    That said... I'm still not happy with $90 battery cartridges.
    Last edited by turbodog; 04-01-2021 at 09:15 PM.
    This is your life, and it's ending one minute at a time.
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  5. #5
    *Flashaholic* turbodog's Avatar
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    Default Re: Fenix LR40R HUGE disappointment, need alternative

    Quote Originally Posted by orbital View Post
    +

    Easiest post I'll ever make.

    Acebeam K30GT

    for it's smallish size, it has an incredibly deep reflector
    12v, running on three 18650 in series
    simple UI

    {if I had only a few seconds to think about it, my vote for the best light to date}
    I looked at that light. With a single emitter and deep reflector it seems like it would be a pretty tight spot beam with little spill.
    This is your life, and it's ending one minute at a time.
    Be prepared for the truth.

  6. #6
    *Flashaholic* turbodog's Avatar
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    Default Re: Fenix LR40R HUGE disappointment, need alternative

    Did some looking on brightguy for other lights in this class. Not much to pick from. Appears anything running from 2-4 18650 only reaches about 5k lumens sustained. A few burst over that, but for very short times.
    This is your life, and it's ending one minute at a time.
    Be prepared for the truth.

  7. #7

    Default Re: Fenix LR40R HUGE disappointment, need alternative

    Possibly one of these: Mateminco TK04 Tactical Flashlight, 13500 Lumens 546 Meters

    I have one on a plane from china...

  8. #8
    Flashaholic* orbital's Avatar
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    Default Re: Fenix LR40R HUGE disappointment, need alternative

    +

    EagleTac always looks to impress,
    the lux numbers are strong too for this:

    http://www.eagtac.com/html/mx3tc/index.html


    https://illuminationgear.com/product...c-rechargeable



  9. #9

  10. #10

    Default Re: Fenix LR40R HUGE disappointment, need alternative

    The LR50R detects the battery carrier with a pogo pin. I bet the LR40R does the same.

    I'm not sure if it just needs pressing down or if it needs a voltage across it. If you know what you're doing, you could measure the voltage from it to the + or - of the battery pack, them see if you can recreate it wil plain cells. Be very careful though, as you could short the driver.

  11. #11
    *Flashaholic* turbodog's Avatar
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    Default Re: Fenix LR40R HUGE disappointment, need alternative

    Quote Originally Posted by turbodog View Post
    ... In the current design, with loose cells, there's not a way to tell how many are present. If you were to load a single cell highly enough you could damage the cell and cause a hazardous situation.

    ...
    After more thought... this ONLY applies if the factory pack has 4 cells in parallel BEFORE the protection circuit.
    This is your life, and it's ending one minute at a time.
    Be prepared for the truth.

  12. #12
    *Flashaholic* turbodog's Avatar
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    Default Re: Fenix LR40R HUGE disappointment, need alternative

    Quote Originally Posted by dave1010 View Post
    The LR50R detects the battery carrier with a pogo pin. I bet the LR40R does the same.

    I'm not sure if it just needs pressing down or if it needs a voltage across it. If you know what you're doing, you could measure the voltage from it to the + or - of the battery pack, them see if you can recreate it wil plain cells. Be very careful though, as you could short the driver.
    Sort of moot. The 10k lumens is only good for a very short time... couple of minutes maybe.
    This is your life, and it's ending one minute at a time.
    Be prepared for the truth.

  13. #13

    Default Re: Fenix LR40R HUGE disappointment, need alternative

    Quote Originally Posted by turbodog View Post
    Sort of moot. The 10k lumens is only good for a very short time... couple of minutes maybe.
    If you want a light that is brighter than 10,000 lumens after 10 minutes then your options will be very limited.

    The Acebeam X70 and Imalent MS18 should just manage it. Possibly the GT4 and GT94. I don't know of any other lights that will come close.

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