LF EO-M3 on 2x17500?

[nzgunnie]

I've got a 3 cell SF Millenium weapon light on the way (basically an M3), and was wondering about 2x17500 and the LF EO-M3. I see by it's specs that it draws 2 amps, so on 2x 1100mAh cells this should just be under 2C.

I know the MN16 (@2.5 amps) draws too much for these cells, I'm hoping this lamp will be the brightest I can effectively go with this configeration.

Has anyone here tried this lamp with AWs protected cells? Any feedback appreciated.

Cheers

Phil

 

[mdocod]

Lots of people doing it.... It's basically the same lamp as a EO-9 that people are using on 2x17500 in G3/9P/C3 etc type lights. It'll work great.

oh.... FYI: a MN16 wouldn't even fit in an M3, maybe you were thinking of a MN11?

Question: what lamp does this weaponlight normally come with? (or what weaponlight is it thats coming)... I just want to make sure you are talking about the right bulb for it. The EO-M3 will not fit in the same place that a MN16 will.

 

[sixshooter_45]

I've got a 3 cell SF Millenium weapon light on the way (basically an M3), and was wondering about 2x17500 and the LF EO-M3. I see by it's specs that it draws 2 amps, so on 2x 1100mAh cells this should just be under 2C.

I know the MN16 (@2.5 amps) draws too much for these cells, I'm hoping this lamp will be the brightest I can effectively go with this configeration.

Has anyone here tried this lamp with AWs protected cells? Any feedback appreciated.

Cheers

Phil

That's the exact set-up I have for my M3-CB, it's AWESOME! :twothumbs Excellent throw, hot spot, decent spill all in one. A single Click works great which is good because I hate to double click a light just to get it to work.

I also have the HO-9, 320 Lumens, (about 200 lumens in reality), with a 1.551A draw for my S.F. 6P, using 2 AW's RCR123 and it's awesome too. Tha puts me a hair over 2C @ 2.068C if I'm figuring this correctly.

I also so use the W.E. HO D26/Cree XR-E LED 3.7V-13V D26 Lamp, *High Output* 170 lumens, for work and it's Awesome.

I'm going to get a Makoff M60 for a new S.F. 6PD-BK soon, LOL.

And I'm thinking about the Leef 18500 body now with McClicky tailcap, not sure about the tailcap but it sure looks good.

Sorry, I got carried away.

 

[nzgunnie]

oh.... FYI: a MN16 wouldn't even fit in an M3, maybe you were thinking of a MN11?

Question: what lamp does this weaponlight normally come with? (or what weaponlight is it thats coming)... I just want to make sure you are talking about the right bulb for it. The EO-M3 will not fit in the same place that a MN16 will.

Thanks for your help with the EO-M3.

I know the MN16 doesn't fit, I was just using that as a reference to the current draw, as I have one in a KT1, and know that 2x17500s wont light it (I actually run it on 2x18650s in a leefbody).

I'm not actually sure what lamp (if any) will come with the weapon light. I bought it from BST, it's a bit scratched and dented, doesn't come with a tail cap (although I have a couple of those anyway). It's a M961, so may have either an MN10 or 11 installed, or nothing at all. I picked it up pretty cheaply and didn't even ask.

I'm just trying to find the brightest lamp I can run on the 2x17500s.

 

[mdocod]

I also have the HO-9, 320 Lumens, (about 200 lumens in reality), with a 1.551A draw for my S.F. 6P, using 2 AW's RCR123 and it's awesome too. Tha puts me a hair over 2C @ 2.068C if I'm figuring this correctly.-sixshooter

unfortunately discharge "C" rates aren't that simple. The label capacity of the RCR123 may be 750mAH, but the delivered capacity at ~1.5A is closer to ~550mAH or less. The discharge rate is actually about 2.8C. Use it in short bursts and top it off frequently to keep those cells reasonably healthy, when they start showing signs of aging please discard them. (When they won't hold a charge above 4.00V they are done.)

 

[nzgunnie]

Just found out it comes with an MN11.

I'm assuming that draws 2.4 - 2.5 amps like the MN16?

Cheers

Phil

 

[mdocod]

yep, actually on Li-Ion cells the MN11 would be closer to 2.6-2.7A.

 

[sixshooter_45]

unfortunately discharge "C" rates aren't that simple. The label capacity of the RCR123 may be 750mAH, but the delivered capacity at ~1.5A is closer to ~550mAH or less. The discharge rate is actually about 2.8C. Use it in short bursts and top it off frequently to keep those cells reasonably healthy, when they start showing signs of aging please discard them. (When they won't hold a charge above 4.00V they are done.)

ok, thanks for the input mdocod, I appreciate it, but I can see from your info that my approach to calulate "C" was correct but I had used the battery rating instead of the capacity of the batteries @ the given L.A. rating, correct.

So what is the formula, for figuring the actual battery capacity for a given L.A. amp rating so that I could properly calculate the batteries discharge rate "C"? :thinking:

Thanks for any info.

 

[mdocod]

the best way to figure out your "C" rate is to just look at runtime. Anything with over 30 minutes of runtime is under the 2C rate, 20 minutes runtime is 3C, 15 minutes runtime is 4C, 60 minutes is 1C, etc etc. That's the best way to get a reasonable estimate of the "C" rate... Check the compatibility chart in my sig to see my estimated runtimes, (keep in mind I low-ball the estimates by a few % in most cases). Best thing to do is pick configurations that are estimated to have 30 or more minutes runtime.. but "pushing" it a little harder can be done in short "bursts" without too much trouble usually.

 

[sixshooter_45]

the best way to figure out your "C" rate is to just look at runtime. Anything with over 30 minutes of runtime is under the 2C rate, 20 minutes runtime is 3C, 15 minutes runtime is 4C, 60 minutes is 1C, etc etc. That's the best way to get a reasonable estimate of the "C" rate... Check the compatibility chart in my sig to see my estimated runtimes, (keep in mind I low-ball the estimates by a few % in most cases). Best thing to do is pick configurations that are estimated to have 30 or more minutes runtime.. but "pushing" it a little harder can be done in short "bursts" without too much trouble usually.

Thanks, I've read and have saved your info.