etc
Flashlight Enthusiast
2xAA Lithiums = 1.7x2=3.4 V
1x123 = 3V
why would a single 123 blow it up?
1x123 = 3V
why would a single 123 blow it up?
Malkoff M31
- Thread starter mfrey
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Flashlight Enthusiast
I use both M60L and M60LL in the 1x18650 configuration, works very nice and more useful than M30 since I can use *either* 123s or 18650, with output being 140 and 120 lumens, respectively, with much greater runtime than M30.
To me, M30 in a 1x18650 body didn't make much sense since I couldn't use primaries in a backup situation.
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Flashlight Enthusiast
I had an M30 with 3xAA cells. It always stayed in the drawer and saw next to zero actual use since other combos were much more practical. I eventually put M60LL in the 3xAA body.
The point being is that M31 is a step in the right direction, maximum output on 2xAA. Good job.
I am confused (not a new phenomenon 😛).
Theoretically a single AA will power the M31 just not at full specs right? I seem to be reading contradictions above about this but it could easily be me not understanding correctly.
Will it run it enough to put out say 100+? If so any guesses on how long?
Theoretically a single AA will power the M31 just not at full specs right? I seem to be reading contradictions above about this but it could easily be me not understanding correctly.
Will it run it enough to put out say 100+? If so any guesses on how long?
Are you saying on say an eneloop you could get 150 for an hour? I am trying to decide if I should buy one of these as part of my solution. Then again finding a VME head seems impossible as well.
But if an eneloop won't power it at all I won't bother.
red02
Enlightened
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Long answer:
The current is about 350mA for 100lm. The Eneloops are 2000mAh, but they need to be discharged at a higher current to boost the voltage to that of the LED. At a higher current they are not as capacious so they only last about an hour. How well the M31 is regulated is another question. It could give you a flat 150 for 1hr then cut out or something like 150 for 20min, 130 for 10 min, and 100 for the rest of the time or something in between.
The good thing is that the module is regulated to 0.8v which is pretty much completely exhasted for an eneloop and the Malkoff are highly regarded here so its likely that the regulation will be flatter until the end and more even after an initial spike in voltage and output. We wont know until someone tests this.
Short Answer: Yes... probably.
red02
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Malkoff used to have a resistor based selector switch. http://flashlightconnection.com/Malkoff-Devices/Malkoff-Hi-Low-Bezel-Switch-MD2-p133.html it might be compatible.
You could always get an E2C adaptor and a Z44 bezel. Those two in tandem make a great combination for housing the Malkoff units on an E-series body. I prefer it to the VME head.
Last I checked, Oveready had both TnC and Surefire E2Cs in stock. You can pick up a Z44 with ease in the CPFMP.
Last I checked, Oveready had both TnC and Surefire E2Cs in stock. You can pick up a Z44 with ease in the CPFMP.
I don't want to plan an anything not readily available for sure...hate banking on the MP...also the c series heads are larger and I like the smaller form factor.
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PoliceScannerMan
Flashaholic
The M61 runs just fine on a 18650, it is the M30/M60 of the "61" series. Gene designed the M31 for the AA guys. :twothumbs
It looks like Gene has confirmed 150 lumens at 1.2V (one NiMh cell). From the updated M31 webpage:
That's good news for those of us looking to drive it off one cell. It should be even brighter using one NiZn at 1.6-1.7V.
The output is approximately 230 measured out the front lumens at 1.8-3.3v and 150 lumens at 1.2v.
That's good news for those of us looking to drive it off one cell. It should be even brighter using one NiZn at 1.6-1.7V.
Curias
Newly Enlightened
The M31 will work on Surefire E-series lights, right? Specifically the E1B and E2L AA. With the VME head of course.
red02
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It looks like Gene has confirmed 150 lumens at 1.2V (one NiMh cell). From the updated M31 webpage:
The output is approximately 230 measured out the front lumens at 1.8-3.3v and 150 lumens at 1.2v.
That's good news for those of us looking to drive it off one cell. It should be even brighter using one NiZn at 1.6-1.7V.
How good is the regulation as the battery depletes to 0.8v?
Gene specified earlier in this thread that the dropin would deliver about 300mA to the emitter at start-up (0.9V by the initial specs). 300mA elicits about 85% of the baseline flux at 350mA per CREE's data sheet. Given 139 lm (per the data sheet) for an R5 bin at 350mA, you can make an approximation of about 118 lm at start-up.
Just my stab at it... Maybe bigchelis could take a reading on a depleted cell when he gets his hands on one for testing.
Just my stab at it... Maybe bigchelis could take a reading on a depleted cell when he gets his hands on one for testing.
