M6 Runtime Graph?
- Thread starter wmugrad28
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mdocod
Flashaholic
you might have a look at silverfoxes lithium shootout. while not output charts, these might help give an idea of how the discharge cycle looks... the 2.5A tests will give a good idea of how the MN21 would operate. The MN20 is somewhere between the 1.0 and 1.5A tests.
I don't have any, although I hazily recall seeing some lots of years ago, but the runtime will be... uh, short. IIRC, SF's numbers on the MN21 was 20 (18?) mins, and they tend to be fairly honest, and the runtime with lithiums pretty steady, but not as flat as a regulated light.
Also IIRC, there has been a lot of talk about variances in performance of the various battery brands under stressful loads such as this. I recall hearing some people would encounter thermal shutdown if they tried to run the light constant on with the HOLA, where others would not. If I recall, Al has suggested the M6 wasn't really intended to be run for 20 mins straight with the HOLA.
I'm not sure what you objective is based on your question, but I agree Silverfox's graphs are helpful to gauge performance. Personally, I prefer Streamlight batteries in my high drain lights like my M6, but SF brand is a close second.
-john
Very nice.
Going back and looking at SilverFox's graphs, it looks like even the premium cells start to fall apart at 2.5 amps, even when their 2.0 amps performance seems pretty good. It is interesting that the HOLA line on your graph looks almost exactly like the best 2.5 amp graphs that SilverFox performed.
Without doing any math, and just looking at the graphs, it looks like the HOLA is drawing more than 2 amps.
Looks to me that the M6 HOLA is pushing the 123a format to the very edge.
-john
Going back and looking at SilverFox's graphs, it looks like even the premium cells start to fall apart at 2.5 amps, even when their 2.0 amps performance seems pretty good. It is interesting that the HOLA line on your graph looks almost exactly like the best 2.5 amp graphs that SilverFox performed.
Without doing any math, and just looking at the graphs, it looks like the HOLA is drawing more than 2 amps.
Looks to me that the M6 HOLA is pushing the 123a format to the very edge.
-john
I measured 4.7A draw on fresh cells with the MN21... if you consider that my cheapo DMM introduces some resistance in the circuit, actual draw could be close to 5A... in 3s2p connection, that's 2.5 A per bank... yes, the very edge.
I have a dream... A MOLA for the M6... A bulb with 3.5-4A current draw, which would allow it to better utilize the cells, have better runtime, while still putting out lots of lumens. LumensFactory, you listening?
I have a dream... A MOLA for the M6... A bulb with 3.5-4A current draw, which would allow it to better utilize the cells, have better runtime, while still putting out lots of lumens. LumensFactory, you listening?
Well, a replacement LED head for the M6 already exists - it's the KL6... but obviously it's not even in the same ballpark with MN20/MN21 in a turbohead. A multi-emitter LED head for the M6 with 500+ lumen output would be interesting, but it will not be a thrower - multiple small reflectors are no match for a single big reflector in terms of throw...
Yes, I used to be
batman
Enlightened
i guess i'm not suprised with the discharge cycle considering I've never even heard of the batteries he used.
Actually, according to silverfox, these cells behave really well under high loads:
http://www.candlepowerforums.com/vb/showthread.php?t=67078
Anyway, feel free to send me your favorite batteries, and I'll be happy to test them in my M6.
http://www.candlepowerforums.com/vb/showthread.php?t=67078
Anyway, feel free to send me your favorite batteries, and I'll be happy to test them in my M6.
OK, so I was bored...
I re-tested the runtime on MN21 using Energizer Photo Lithium primaries this time (no thank to batman). Here are the results - plotted right next to my earlier data.
As you can see, the output on Energizers is initially a bit less then on Tenergy cells, but Energizers catch up in less then 2 minutes as the cells heat up, and then continue to maintain a lead up until the the thermal shutdown that occurred at 14:46 despite the light being water cooled. The test was continued after letting the cells recover/cool to room temperature.
Just wanted to share.
I re-tested the runtime on MN21 using Energizer Photo Lithium primaries this time (no thank to batman). Here are the results - plotted right next to my earlier data.
As you can see, the output on Energizers is initially a bit less then on Tenergy cells, but Energizers catch up in less then 2 minutes as the cells heat up, and then continue to maintain a lead up until the the thermal shutdown that occurred at 14:46 despite the light being water cooled. The test was continued after letting the cells recover/cool to room temperature.
Just wanted to share.
Brozneo
Enlightened
Awesome to see these runtime graphs people! Excellent!
Brozneo
Enlightened
An multiple LED replacement head would rock!
Well, a replacement LED head for the M6 already exists - it's the KL6... but obviously it's not even in the same ballpark with MN20/MN21 in a turbohead. A multi-emitter LED head for the M6 with 500+ lumen output would be interesting, but it will not be a thrower - multiple small reflectors are no match for a single big reflector in terms of throw...
Yes, I used to be
I had Scott (Milky) build a KL6 head with a P4 emitter driven by an SOB 1000 recently. AS led's go, it's a pretty good thrower and I can mount it on an M3, M4 or M6 body. Actually, the best configuration seems to be the KL6 mounted on an M4 body bored out to accept 2 x 18650s.
Even at its best, the modified KL6 is not in the same ballpark with the M6 fitted with an incandescent, but it does have greater runtime.
bill
