VME Ideal Pairing

Wurkkos

Owen

Flashlight Enthusiast
Joined
Feb 14, 2002
Messages
1,989
Location
AL
If I remember correctly, when you increase voltage with this driver it will just lower the current draw from your cells. The driver does not allow any additional current to be delivered to the LED. The question is, will that 18650 drop from 4.2v's down below 3.4v into direct drive before two cr123's will drop from 6v's to below 3.4v and that all depends on your batteries capacity. The output should not change (at least nothing you could physically see) as long as whatever cell you are using is above 3.4v's and below 9v's.
That should be right(and everything else you posted is spot on), but for whatever reason, the output does increase somewhat at higher voltage. I don't know why, or have an explanation for it, but it's visible in person and we can see it on the graphs that chart brightness along with runtime. The difference isn't enough to matter in actual use(IMO), and I've never cared enough to pursue an explanation, either, but have always been a bit curious as to why.

Anyhoo, due to the greatly increased capacity vs. 2 shorter li-ions, 1x18650 is certainly the most practical power source for the M61 in a MD2 body, in spite of not being designed or optimized for it(hence the long taper with gradual dimming vs. full brightness 'til the battery is exhausted). That's what I've always used, but there's a downside-for me, anyway.

My take is that if I want a M61, I want a M61, not a M61 that becomes a M61L halfway through the battery life, then a LL, LLL, LLLL, afterwards. Personally, if a LL was what I needed, that's what I'd have been using to begin with, because it would give steady brightness for a lot longer.

Which is "better" always depends on what you want from the light, but I actually swap batteries less often with the M61HOT in my work light than the M61N it replaced, because it has longer regulated runtime(which is what I want from that particular light) on 1x18650 than a regular M61 with a buck circuit.
There's a big difference between "designed for" and "can be used with", and that somehow escapes a lot of people.
 

thermal guy

Flashaholic
Joined
Jan 28, 2007
Messages
7,928
Location
ny
The M61 on a 18650 puts out 25 less lumens then on 2X123’s. Thats not even enough different to see. It maintain that level for the listed 1.5 hours. At 2 hours it’s still over 200 lumens where the 2X123’s are down to 10 lumens or so. So absolutely the 18650’s are the way to go providing you do not need the extra security of running 123’s.
 

Nimitz68

Enlightened
CPF Supporter
Joined
Dec 29, 2017
Messages
552
Location
USA
I added my Malkoff Ti VME head to a McGizmo Ti 2x16340/1x16650 McClickie Pak and my Malkoff group buy M361 N219C 92CRI 3000K drop-in:

20190705_201558.jpg
 

troutpool

Flashlight Enthusiast
CPF Supporter
Joined
Apr 22, 2010
Messages
1,021
Location
Arizona
My ti VME head is on a ti McGizmo 1x123 clicky pak, an obvious choice and a great combination.
 

flashy bazook

Flashlight Enthusiast
Joined
Jan 7, 2007
Messages
1,140
Thanks for the many answers on using the M61 with the 1x18650. RIght now I do not have an up-to-date M61, so I keep the information for future use.

I very much like the Ti-VME head, and I also have it attached to a McGizmo body (2xAA). And I use a Malkoff drop-in, the M31W.

No question that works well :).
 
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