Malkoff M91

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Lol ya well we can’t have everything now can we? I’ll take a rock solid built like a tank Dropin that puts out good light fro 3-12 volts.
 
I just dropped a couple partially used Lithium AAs into an MD3 (with Delrin sleeve), screwed the M91BN onto the end and.......got light.

Yep. You read that right.
 
Well that’s 3 volts right. I was thinking of doing that with my 2XAA Tube.

We really need INFRNL back! I mean I know he’s still here but we need his expertise and time and patience. To explore this great find.
 
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I actually tested a couple Eneloops first, presuming it wouldn't work, and I was right.

I've only got two Lithium AAs in my random battery box, and was pretty sure it would work, at least for a little while.

I'm topping off a couple KeepPower 18650s for an across the bedroom lux comparison between it and a very nicely tinted
M61 XP-G2. My guess is that the M91BN will prevail.

If another group buy were to occur, I'd happily run one in an MD2 from an 18650 for EDC purposes. If a pocket rocket
is needed, a couple 18350s will make it happen.
 
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Got my 5000K M91. The beam and tint are both winners! Love it. And to read all these posts about it running on 1x18650 is awesome!! I’m running mine in a leef 2x18650 body with a Cryos head with SF TC with oveready mcclicky. Nice set up.
 
And confirming my suspicion ...

The M91BN delivers ~30-40 lumens from 2xAA Alkalines (appearing ~ double the Pelican 1920 on its 22 lumen 'low' mode);

Runtime should be /substantial/ - alkaline cell chemistry can maintain close to its initial voltage for quite a while as long as drain rates are relatively low. ;)
 
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Could a few people be so kind as to compare the beam quality of their various generations of M91's against these M91BN's ?

My first-generation M91N has the typical modest rings in the beam, as the original XM-L wasn't a perfect match for the M61 XP-G reflector.

This (XP-L2 ???) used in this latest 'BN' has a perfect beam w/ absolutely no artifacts, something I didn't expect.
What artifacts (if any) have people seen in their M91A's & M91B's - and did we perhaps get lucky with the emitter chosen for this latest Group Buy ?
 
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Kestrel said:
Could a few people be so kind as to compare the beam quality of their various generations of M91's against these M91BN's ?

My first-generation M91N has the typical modest rings in the beam, as the original XM-L wasn't a perfect match for the M61 XP-G reflector.

This (XP-L2 ???) used in this latest 'BN' has a perfect beam w/ absolutely no artifacts, something I didn't expect.
What artifacts (if any) have people seen in their M91A's & M91B's - and did we perhaps get lucky with the emitter chosen for this latest Group Buy ?
Click to expand...

These were just XPL's (no "-2") and yes I think we got extremely lucky.
 
Kestrel said:
And confirming my suspicion ...

The M91BN delivers ~30-40 lumens from 2xAA Alkalines (appearing ~ double the Pelican 1920 on its 22 lumen 'low' mode);

Runtime should be /substantial/ - alkaline cell chemistry can maintain close to its initial voltage for quite a while as long as drain rates are relatively low. ;)
Click to expand...


Well 6 1/2 hours in and still going strong. I’d say 10-15 lumens and it is still very useful. No problem walking around in the dark with. But my butt is headed to bed so........
 
I have three drop-ins with XM-L2 emitters, an M91AW and a couple M61 XM-L T6. All three have a very diffuse transition between the spot and the corona, and a well defined border between the corona and the outer spill. This outer border could be called a ring, since it's slightly darker than the two "zones" surrounding it. Each has minor artifacts within the beam that are only visible by rotating the light around its central axis, while shining the light directly at a white wall at less than 5 feet. None of these non-perfect aspects are visible at all when the light is being used as intended.

The M91BN's transition from spot to corona is well defined, without a darker ring between them. The transition from corona to spill is very diffuse. No artifacts are visible while rotating the light.
 
thermal guy said:
Well 6 1/2 hours in and still going strong. I’d say 10-15 lumens and it is still very useful. No problem walking around in the dark with. But my butt is headed to bed so........
Click to expand...

Wow, who'd have thought. Your decision to not start the test in the evening was a good one.

When you decide to end the test, try turning it back on again. My guess is that the LED won't fire up.
 
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That’s my bet as well. I tested it earlier with a single 123 and once I turned it off she wouldn’t come back on.



Update yep. We were right. Shut it off a little over 6 1/2 hours in and she’s done. Still..... not to shabby
 
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Sooooo 6 1/2 hours I shut her off and I would not turn back on. Kinda figured that. Alkalines Being what they are I figured once they sat for a few hours they would kick back in. And they did. I woke up to my flashlight being on. I must of hit the tail cap to many times when I was trying to get her back on. It ran for a good hour but I got bored and just turned it off again. Here is the part I don’t get. I tested the batteries Duracell ultra’s and they are at 1.45 and 1.47! There full up! I even put them in one of my double AA to make sure.

So if I’m getting this right. The reason they are still good is because the 91’s driver stops working at 3 volts? This thing ran for like 8 hours at 15-20 lumens and used practically no juice?

Ok just checked draw. 26 MA with 2AA’s. Wow
 
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