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Thread: Malkoff M91

  1. #1261
    Flashaholic* NutSAK's Avatar
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    Default Re: Malkoff M91

    Well, I'll be testing mine again this evening I guess!
    - Terry

  2. #1262
    *Flashaholic* thermal guy's Avatar
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    Default Re: Malkoff M91

    Maybe there all just a little different.but thatís a big difference between 1.6 and 2.3. Iím thinking mine is pulling more then most at that voltage.
    If i had one day left to live i would want to be at my workplace.Because every day is like a frickin eternity.

  3. #1263

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    Default Re: Malkoff M91

    I'll do some testing tonight as well and actually put down some numbers. Most curious as to what is going on here, and definitely want to see how they compare to the first run! I'd be surprised if they were different- at least by that significant of a margin.
    Proud owner, SkyLumen Nguyen #011

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  4. #1264
    *Flashaholic* thermal guy's Avatar
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    Default Re: Malkoff M91

    Not sure but mine is.
    If i had one day left to live i would want to be at my workplace.Because every day is like a frickin eternity.

  5. #1265
    Administrator Kestrel's Avatar
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    Default Re: Malkoff M91

    This is not the first time we've seen different numbers from this module when used with a single LiIon; I'm wondering that since they are basically running direct-drive in this configuration, are inconsistencies in our individual emitters /and/ LiIon cells (old/new i.e. internal resistance) causing this ?

    We wouldn't notice this behavior on 2x LiIon, because the driver is operating in its normal regime - i.e. buck regulation.

  6. #1266
    *Flashaholic* thermal guy's Avatar
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    Default Re: Malkoff M91

    Thatís probably it but I can rule cells out as I used the same 18650 for each.
    If i had one day left to live i would want to be at my workplace.Because every day is like a frickin eternity.

  7. #1267
    Administrator Kestrel's Avatar
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    Default Re: Malkoff M91

    Ya that's a good point; I confess that my primary suspect was the internals of individual cells.

  8. #1268

    Default Re: Malkoff M91

    As a data point, I have mine (rosy) on an MD3 with 3x 16340s (Orbtronic) and it pulls 1 amp on hi and .13 on low.

  9. #1269
    *Flashaholic* thermal guy's Avatar
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    Default Re: Malkoff M91

    Thatís pretty much exactly what I just got on mine with 3X16340ís.
    If i had one day left to live i would want to be at my workplace.Because every day is like a frickin eternity.

  10. #1270
    Flashaholic* NutSAK's Avatar
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    Default Re: Malkoff M91

    Disregard my measurements from earlier. The DMM I was using had a bad set of probes. New measurements with an 18650 fresh off the charger showed 2.46 amps on high and 20.4 mA on low. With the cell down to 3.9 volts, current was 1.96 A.
    - Terry

  11. #1271

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    Default Re: Malkoff M91

    All measurements were taken from the same INR 18650 25R, and the same two AW IMR 18500s. Lux measurement taken in the center of a small 1/2 bath.

    Initial Release:

    4.2 volts - 1.53 amps max, & 211 lux
    8.4 volts - 1.54 amps max, & 286 lux

    Neutral :
    4.2 volts - 2.1 amps max, & 280 lux
    8.4 volts - 1.42 amps max, & 280 lux

    Magenta:
    4.2 volts - 1.87 amps max, & 245 lux
    8.4 volts - 1.48 amps max, & 260 lux

    I performed almost all of the above tests twice, since the results were so surprising.
    Last edited by Grizzman; 07-08-2020 at 07:16 PM.

  12. #1272
    Flashaholic* NutSAK's Avatar
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    Default Re: Malkoff M91

    I should add that mine is neutral, not rosy...
    - Terry

  13. #1273
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    Default Re: Malkoff M91

    Quote Originally Posted by NutSAK View Post
    Disregard my measurements from earlier. The DMM I was using had a bad set of probes. New measurements with an 18650 fresh off the charger showed 2.46 amps on high and 20.4 mA on low. With the cell down to 3.9 volts, current was 1.96 A.
    Ok so Iím not going crazy. This new batch draws much different then the first batch?
    If i had one day left to live i would want to be at my workplace.Because every day is like a frickin eternity.

  14. #1274

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    Default Re: Malkoff M91

    I'm only getting 1.7 max on one Lithium ion. Keeppower 3500mAh protected.

    I get 1.6 A draw consistently on 2x lithium ion. Interestingly, while the Rosy I have is significantly brighter on 2x lithium ion, the Neutral is brighter on 1x 18650, which I get 800 lumens on. I didn't think these would be so good on a single 18650!
    Proud owner, SkyLumen Nguyen #011

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  15. #1275
    *Flashaholic* thermal guy's Avatar
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    Default Re: Malkoff M91

    Ya this batch seems brighter on a single lithium For sure. She a totally different animal this time around.
    If i had one day left to live i would want to be at my workplace.Because every day is like a frickin eternity.

  16. #1276

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    Default Re: Malkoff M91

    They're so good from 4.2 volts that both are attached to 18650 hosts. If I want to use one with an MD3 or 4 body, it'll be from the initial batch.

    I'm going to do a couple quick tests with a KeepPower protected 3500 mAh 18650 to see how it compares to the AW IMR.

  17. #1277
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    Default Re: Malkoff M91

    I agree. Mine is replacing the rare M61W I've had in my daily carry MD2 for years. I'm sure the runtime will be shorter, but output and runtime are always a give and take.

    The majority of my usage of that light is on low anyway, but it's nice to have the extra output on high when needed.
    Last edited by NutSAK; 07-09-2020 at 04:35 AM.
    - Terry

  18. #1278
    Flashaholic* NutSAK's Avatar
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    Default Re: Malkoff M91

    Quote Originally Posted by id30209 View Post
    Dayuuuum...we need to do some tests, runtime etc


    Sent from Tapatalk
    Agreed. Anyone doing runtime tests on these should take precautions and heat sink them in water. At 2+ amps, 4.2V these guys get pretty warm after 15 minutes or so free-standing. I don't think the heat would be much of a issue when holding it in normal use.

    I think I might do a 1-hour test tonight with a visual output comparison to an M61 and see where the voltage ends up.
    - Terry

  19. #1279
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    Default Re: Malkoff M91

    Fascinating info on the "V2" modules. Glad I got in on the group buy... Looking forward to more results!
    The TK20. Yes, it still rocks- WoodsWalker

  20. #1280
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    Default Re: Malkoff M91

    I did a quick runtime test while at work this morning. It's unscientific, so take if for what it's worth.

    Time: Voltage:
    0 min 4.2
    30 min 3.85
    60 min 3.59
    75 min 3.5
    90 min 3.4

    The test was run with a 3-year-old Panasonic 3500mAh cell, unprotected. I tested the capacity of this cell two months ago at just above 3200mAh.

    Voltages shown are resting voltages and that is why I stopped where I did. I consider a Li-Ion cell at 3.4V resting to be 100% depleted. It appears that runtimes are approximately 70-75% of the first run of the M91BN, but that is a rough estimate based on INFRNL's graphs. This seems to roughly coincide with Grizzman's current measurements above as well.

    I didn't have any way of measuring output so I'll just say it was still plenty bright at 3.4V.
    Last edited by NutSAK; 07-09-2020 at 11:58 AM.
    - Terry

  21. #1281
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    Default Re: Malkoff M91

    So those who own both M91N's if you could only keep one, which would u keep? Run 1 or 2?
    In no order: HDS/Malkoff/OVEREADY/McGizmo/Sky Lumen -PSM

  22. #1282
    *Flashaholic* thermal guy's Avatar
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    Default Re: Malkoff M91

    Run 1. No question.
    If i had one day left to live i would want to be at my workplace.Because every day is like a frickin eternity.

  23. #1283
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    Default Re: Malkoff M91

    My Run 1 is by far my favorite drop in of any brand.
    In no order: HDS/Malkoff/OVEREADY/McGizmo/Sky Lumen -PSM

  24. #1284

    Default Re: Malkoff M91

    Quote Originally Posted by PoliceScannerMan View Post
    My Run 1 is by far my favorite drop in of any brand.
    I agree, if I could only have one Malkoff light, it would run #1.

  25. #1285

    Default Re: Malkoff M91

    Can someone post a whitewall shot of v1 vs v2? Iím just curious. Please correct me if Iím wrong. V1 appears to be slightly lower in output but more efficient?

  26. #1286
    *Flashaholic* thermal guy's Avatar
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    Default Re: Malkoff M91

    slightly lower in output but more efficient yes but the tint and beam of V1 is absolutely the best I have seen.Again not putting V2 down but it canít hold a candle ďapart from Being slightly brighter ď to V1. Iím thinking we just got real lucky and it will forever be the holy grail of 91ís.
    If i had one day left to live i would want to be at my workplace.Because every day is like a frickin eternity.

  27. #1287

    Default Re: Malkoff M91

    Can anyone comment on Geneís standard M91 offerings in cool and warm in comparison with gb version 1&2?

  28. #1288
    *Flashaholic* PoliceScannerMan's Avatar
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    Default Re: Malkoff M91

    I have V1 M91N and a M91BW. The warm M91BW is WARM, warmer than incandescent. Way way warmer than M91BN 5000K.
    In no order: HDS/Malkoff/OVEREADY/McGizmo/Sky Lumen -PSM

  29. #1289

    Default Re: Malkoff M91

    Quote Originally Posted by PoliceScannerMan View Post
    I have V1 M91N and a M91BW. The warm M91BW is WARM, warmer than incandescent. Way way warmer than M91BN 5000K.
    Like the v1 m91b does it put out about 500lumens on one cell without drawing too much like the v2 seems to?

  30. #1290
    Flashaholic* NutSAK's Avatar
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    Default Re: Malkoff M91

    Quote Originally Posted by nmiller View Post
    V1 appears to be slightly lower in output but more efficient?
    Quote Originally Posted by thermal guy View Post
    slightly lower in output but more efficient yes
    How do you know v1 is more efficient? Longer runtime at lower output doesn't mean more efficient. More efficient would mean that it has a better ratio of runtime to output. From what we've seen so far that efficiency is similar, but one module (v2) has more output than the other (v1) on one cell.

    Quote Originally Posted by ledbetter View Post
    Like the v1 m91b does it put out about 500lumens on one cell without drawing too much like the v2 seems to?
    What is too much current?
    Last edited by NutSAK; 07-09-2020 at 03:41 PM.
    - Terry

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