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Thread: One month runtime

  1. #1

    Au One month runtime

    I'm looking for a flashlight with a runtime of one month. It should run on a single AA or 18650 cell. The light output should be high enough to navigate complete dark rooms.

    This might sound a little crazy but I'm really curious if there is something like this out there.

  2. #2
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    archimedes's Avatar
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    Default Re: One month runtime

    So ... 24 hrs/day × 31 days/mo = 744 hours ?

    Sure, I'll link up a few below ...

    Well over that duration (on CR123A)

    https://www.candlepowerforums.com/vb...X5-Red-vs-24-7

    Pretty close (on CR123A)

    https://www.candlepowerforums.com/vb...=1#post3689105

    Extrapolated results from AAAA to AA (some well into the weeks range)

    https://www.candlepowerforums.com/vb...=1#post4460068

    Alkaline AA

    http://www.candlepowerforums.com/vb/...t-Runtime-Test

    Two weeks on lithium AA

    http://www.candlepowerforums.com/vb/...nlight+runtime

    Three weeks for "legacy" HDS Clicky (on CR123A)

    https://www.candlepowerforums.com/vb...=1#post4490051

    Some 18650 torches

    http://www.candlepowerforums.com/vb/...-day-Challenge

    HDS Twisty (on 18650)

    https://www.candlepowerforums.com/vb...=1#post3553379

    It depends on how well your dark-adapted vision might be, and what you would consider adequate output.
    Last edited by archimedes; 09-09-2019 at 12:43 PM.
    ... is the archimedes peak

  3. #3
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    Default Re: One month runtime

    With dark adjusted eyes you could probably navigate completely dark rooms with moonlight mode that are available on many of the main stream of quality lights manufacturers you'll see here on CPF. With a single cell flashlight an 18650 battery could last that long or even longer depending on the specific light you get. Check any of the specs of a light you have an interest in and it should give a run time per lumen output to give a general idea of how long you can expect to get depending on the specific battery you put in the light. There are many choices to look at.

  4. #4
    *Flashaholic* StarHalo's Avatar
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    Default Re: One month runtime

    It's a fun thought experiment, but bear in mind that under real-world power outage/third world conditions you only use a flashlight ~5 hours a day total; as it was in the time before flashlights, you use ambient daylight during the day, only when you use the bathroom or after sunset will a light source see any use. You'll find yourself naturally going to bed earlier and waking at sunrise without artificial light, which is to the benefit of the battery life of any artificial lights you're using.

    The bigger battery life concern for emergency outages is the battery-powered radio - if you have any concern for getting information and/or improving morale, this is left on nonstop during waking hours and sometimes beyond that. Larger cells are king here, as a modern 2-3D cell unit [on alkalines] will give you 200-300 hours of runtime.

  5. #5
    peter yetman's Avatar
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    Default Re: One month runtime

    Quote Originally Posted by archimedes View Post
    So ... 24 hrs/day × 31 days/mo = 744 hours ?

    Sure, I'll link up a few below ...
    Well done Arch, I've been racking my brains, and thinking Malkoff M31LLLLLLL, but I was really thinking HDS.
    P
    Peter's shopping list:- HDS / Oveready 170N Exec/LE and an Oveready V4 Nichia Drop In. Otherwise I'm content. Want want want, that's me.

  6. #6
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    Default Re: One month runtime

    I *think* the lowest M61 has been the LLLL ( and related, like the NLLLL and N219 LLLL ? )

    I do see a couple of posts discussing an M61LLLLL but I sort of wonder if that might be a typo, or stuck keypress
    ... is the archimedes peak

  7. #7
    Administrator Kestrel's Avatar
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    Default Re: One month runtime

    Easy, BOSS70 w/ 1x18650; could probably program it to stretch the total runtime to a number of months if desired.
    https://www.candlepowerforums.com/vb...p-v5)-programs

    But how could a true aficionado do without that fine EDC for that extended of a timeframe ?
    Last edited by Kestrel; 09-09-2019 at 01:21 PM.

  8. #8

    Default Re: One month runtime

    Plugging in 1xAA or 1x18650 and 744 hours minimum finds 126 models in my database. Almost all of these are well under 1 lumen. Enough to read by or not trip over things in the dark. Some highlights:

    • The least expensive is the $20 Wowtac A2 with a 45 day firefly
    • Most Armyteks and all Zebralights have a firefly mode that can run for 2 months
    • Thrunite has a bunch for good prices
    • Most of the serious brands have several models with a firefly: Olight, Nitecore, Acebeam, Eagletac, Klarus, Rofis
    • Fenix hates firefly modes. They only have 1 light that qualifies: the UC35 V2.0
    Try the largest, fastest, most flexible flashlight search engine: parametrek.com
    41 brands, 2124 models and still growing!
    NEW: battery search, sleeping pads search

  9. #9
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    Default Re: One month runtime

    Kestrel- (buy two?)
    But February made me shiver
    with every paper I delivered.

  10. #10

    Default Re: One month runtime

    Under ground bunker light quest thread here.……post Cold War.

    I'll try a Yuji in a 2 cell Maglite ML25 incan version, using alkalines then perhaps see how many weeks a pair of c sized Imedions would last.
    John 3:16

  11. #11
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    Default Re: One month runtime

    Quote Originally Posted by archimedes View Post
    I *think* the lowest M61 has been the LLLL ( and related, like the NLLLL and N219 LLLL ? )

    I do see a couple of posts discussing an M61LLLLL but I sort of wonder if that might be a typo, or stuck keypress
    Deliberate typo.
    P
    Peter's shopping list:- HDS / Oveready 170N Exec/LE and an Oveready V4 Nichia Drop In. Otherwise I'm content. Want want want, that's me.

  12. #12
    Flashaholic* nightshade's Avatar
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    Default Re: One month runtime

    My favorite pick: Pak-Lite with a 6 AA to 9 Volt battery adapter. Easy to improvise a waterproof container, even one that will float with the Pak-Lite and adapter inside.

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    Default Re: casino real money games

    Plus one on the Pak-Lite, nightshade. I did a runtime test on one using a lithium 9v. Their ratings are conservative. As far as the M61LLLL goes, I'll find the post but I think I got one of the first ones back in the day...

    Edit- Oops! It was an M61LLL as custom order from Gene back in 2012. Idea belonged to Leon2245, I just made the phone call. The Pak-lite I ran was on a Duracell, I could still see past my feet to walk around the house after 89 days on low. No further than that, but enough light to not step on legos or the cat...
    Last edited by scout24; 09-09-2019 at 03:25 PM.
    But February made me shiver
    with every paper I delivered.

  14. #14
    *Flashaholic* Burgess's Avatar
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    Default Re: One month runtime

    multiholle --

    You've been a CPF member for * SIX YEARS *,

    and yet this is only your 4th posting ? ? ?


    Guess you've been giving this question
    a WHOLE LOT of thought . . . . .




    Anyway --

    My answer would be a Zebralight SC-5
    (either Mark 1 or Mark 2 version is fine).
    This is a single-cell AA Energizer L91 ultimate lithium

    I can personally attest that even MY tired old eyes
    (66 years, with cataract surgeries, and a
    detached retina) can (if dark-adapted)
    manage to find my way around a totally dark room
    without bumping into things.

    I've even managed to complete a crossword puzzle,
    Sudoku puzzle, and the Celebrity Cypher
    from my daily newspaper !

    Quite an eye-opening experience for me.
    (sorry for the pun)


    _

  15. #15

    Default Re: One month runtime

    2 AA batteries, but original Minimag with a white 3mm LED replacing the original bulb, over a year of usable light (15th of May 2018-15th of May 2019), i had to stop the test due to battery leakage.

  16. #16
    peter yetman's Avatar
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    Default Re: One month runtime

    Impressive.
    P
    Peter's shopping list:- HDS / Oveready 170N Exec/LE and an Oveready V4 Nichia Drop In. Otherwise I'm content. Want want want, that's me.

  17. #17

    Default Re: One month runtime

    +1000 all Zebralights. One of the best candle modes of the factory lights. Manker too, but Zebralight quality is a probably a step above Manker.

  18. #18

    Default Re: One month runtime

    Fenix UC35 v2.0 is rated at 800 hours at 1 lumen on a single 3500mAh 18650.
    Streamlight ProTac HL - SureFire P2X Fury - Fenix PD35 v2.0 - Lumintop Tool AA 2.0 - Fenix PD25 - NiteCore SRT7GT

  19. #19
    Flashaholic* LeanBurn's Avatar
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    Default Re: One month runtime

    Thrunite TN4A will run 80 days in 0.5L firefly mode.
    THRUNITE > Archer1AV2|TiS|TH20|TN4A Hi...all in neutral white
    YUJILEDS BC Series 95+ HiCRI
    > Sofirn C01|Dorcy Penlight (Yuji modded)
    XTARVC4, LCTBC500, Amaloops, 1999 MAG-LITE 2D Incandescent(glass lens) Petzl Tikkina 80L ..... E01

  20. #20

    Default Re: One month runtime

    Okay, I will play.

    Zebralight runs 2928 hours on moonlight, which is way more than enough light for fumbling around the house in the dark.

    - SC64w 18650 XHP35 Neutral White Flashlight

  21. #21
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    Default Re: One month runtime

    Quote Originally Posted by JimIslander View Post
    .... Zebralight runs 2928 hours on moonlight, which is way more than enough light for fumbling around the house in the dark.

    - SC64w 18650 XHP35 Neutral White Flashlight
    So, four months, nice

    Is that per published spec, or calculated, or as a runtime tested result ?
    ... is the archimedes peak

  22. #22

    Default Re: One month runtime

    Quote Originally Posted by archimedes View Post
    So, four months, nice

    Is that per published spec, or calculated, or as a runtime tested result ?
    Published spec for the model I posted. Similar specs for several of their 18650 lights. One of the things I like the most about Zebralights is their incredible range of lumens, from blinding high to night vision protecting lows that run forever.

    Additionally, you can program the light to come on at any level you like, still have double click for high, single click for low, long click for med, or whatever combo you want. Could be LLL, LHM, anything you like.

  23. #23
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    Default Re: One month runtime

    Quote Originally Posted by JimIslander View Post
    Published spec for the model I posted....
    The reason I asked was that CPF member @reppans is a sublumen expert and has found fairly wide variance between published spec and tested results (one of his posts I had linked up earlier)

    If I remember correctly, ZL was one where the published efficiency was different than the measured efficiency

    I don't doubt that it will run more than a month continuous, however.
    ... is the archimedes peak

  24. #24

    Default Re: One month runtime

    Thanks for all the input. I just realized that I own a Zebralight SC5w Mk II with moonlight mode. I never really used those modes.

    L1 3.2 Lm (4.2 days) or L2 1.1 Lm (14 days) / 0.33 Lm (50 days) / 0.09 Lm (4.3 months)

  25. #25
    peter yetman's Avatar
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    Default Re: One month runtime

    How annoying, no excuse to buy a new light then.
    P
    Peter's shopping list:- HDS / Oveready 170N Exec/LE and an Oveready V4 Nichia Drop In. Otherwise I'm content. Want want want, that's me.

  26. #26

    Default Re: One month runtime

    Quote Originally Posted by peter yetman View Post
    How annoying, no excuse to buy a new light then.
    P
    Come on man, that's a very defeatist view of looking at it. You can get a new one for testing, another tint, another manufacturer, or even one more of the same as a backup just in case.

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