MN21 vs. P91 = very close race.

I just got an M6, and took it on a walk in the dark.

I had the HOLA installed on fresh primaries.

Also, My P91 on top of 2x18650,

I must say that the MN21 is the winner, BUT JUST BARELY!!

There was a different beam pattern between them, and it seemed (to my eyes) that they were putting out just about the same amount of overall light.

The M6 had more throw, and was VERY AWSOME, but the lego spread the light all around in a very pleasing cone.

The difference was noticeable, but I was expecting alot more out of the HOLA, or maybe I was just underestimating the power of the P91 on the Li ions.

All in All, it was a very fun walk!

eek, this thread popped up 3 times, hopefully a mod can come along and delete the other 2.....

I get to pick which one stays alive!!! this one!!!

---------------------------------------------------------------

your observations make perfect sense, and is why I always recommend taking dramatic steps upwards in brightness when someone asks about a brighter light. By my estimates the P91 is somewhere around 360 torch lumens on fresh 18650s, while the MN21 on primaries is probably around 550-650 torch lumens... A doubling in output will only appear as a "step" brighter. Light output has to be about 4X for it to appear as "double."

DrK, I am thinking that the MN21 is at least 3X brighter than the P91. Maybe throw is comparable but not overall light. The P91 is bright and does fairly well with two 18650's, and would certainly be cheaper to run than the MN21.

Bill

mdocod said:

eek, this thread popped up 3 times, hopefully a mod can come along and delete the other 2.....

I get to pick which one stays alive!!! this one!!!

Click to expand...

Yep, I tried to post it, but the site went down for a little while, I edited a tiny bit, but I guess I clicked submit a couple of extra times.

Didn't know it was posting, Sorry.

Yeah mdocod, what you said about logrithmic increases makes sense now that I think about it.

It was still fun comparing the two torches.

Bullzeyebill said:

DrK, I am thinking that the MN21 is at least 3X brighter than the P91. Maybe throw is comparable but not overall light. The P91 is bright and does fairly well with two 18650's, and would certainly be cheaper to run than the MN21.

Bill

Click to expand...

+1 something went wrong in that comparison. only I move to say the MN21 is twice, not three times, as bright as the P91 on two 18650's.

LED61, the comparison was between an M6 with MN21, and a P91 with two 18650's. Maybe only 2X's not sure. Need js to step in here. Also, some good beam shots. I used my P91 with two 18650's and noticed that the output degraded over time, now it is is not much brighter than a P90 on two 18650's, which incidentally is really bright. I think the P91 is not too robust, and really needs 3X CR123 for longevity. But that is off track, so is it?

Bill

Bullzeyebill said:

LED61, the comparison was between an M6 with MN21, and a P91 with two 18650's. Maybe only 2X's not sure. Need js to step in here. Also, some good beam shots. I used my P91 with two 18650's and noticed that the output degraded over time, now it is is not much brighter than a P90 on two 18650's, which incidentally is really bright. I think the P91 is not too robust, and really needs 3X CR123 for longevity. But that is off track, so is it?

Bill

Click to expand...

From Mdocod´s incandescent lithium ion thread

Cell configuration: 2x18650

Bulb Options:
LF D26 ES-9: 7W, 117 - 77 lumen in 147 minutes
LF D26 SR-9: 10W, 163 - 110 lumen in 102 minutes
LF D26 HO-9: 12W, 219 - 145 lumen in 80 minutes
LF D26 EO-9: 15.5W, 280 - 188 lumen in 60 minutes
SF P90: 9.5W, 154 - 103 lumen in 104 minutes
SF P91: 20W, 360 - 215 lumen in 43 minutes
G&P G90: 9.5W, 154 - 103 lumen in 104 minutes
G&P D26 7.4V "DX 10W xenon": 10W, 158 - 105 lumen in 104 minutes (guess)
G&P D26 7.4V "DX 15W xenon": 11W, 179 - 119 lumen in 93 minutes (guess)
Pathfinder P90: 10.5W, 167 - 112 lumen in 94 minutes
WE D26 9V: 10.5W, 179 - 119 lumen in 93 minutes
Pila GL3 LA: 10.5W, 179 - 119 lumen in 93 minutes

Body Options:
Leefbody 2x18650 w/C tail and head, +SF compatible tail-cap/bezel. +++
Wolf-Eyes 6 series sniper (non-turbo) +ONE LRB-168 extender, + copper wire mod. ++(requires modification)


360 to 215 lumens for the P91 on two 18650´s, lets take an average of 290 lumens.

And as per SF underrated average lumens on the M6-MN21 combo, 500 lumens, but I´ve heard Jim say that output at start of run is closer to 630-650 lumens.

And then I´ve made a comparison between my brother´s P91 on 18650´s and my M6 with 123´s, and it does look twice as bright, but a totally different beam pattern. The P91 will never have as much throw, or the MN21 as much flood.

LED61 said:

The P91 will never have as much throw, or the MN21 as much flood.

Click to expand...

Well said,
That was all I was really getting at.

To paraphrase my point.

It seemed if the beam of the P91 beam profile were compressed down to the size/shape of the m6 HOLA, it would be a very close comparison (via the human eye/brain).

Dr.K said:

Well said,
That was all I was really getting at.

To paraphrase my point.

It seemed if the beam of the P91 beam profile were compressed down to the size/shape of the m6 HOLA, it would be a very close comparison (via the human eye/brain).

Click to expand...

Basically the MN16 LA + turbo head on 2 18650s would be very similar to the human eye. Correct?

jugg2 said:

Basically the MN16 LA + turbo head on 2 18650s would be very similar to the human eye. Correct?

Click to expand...

I wouldn't know the answer to that question, unless the MN16 and P91 have the same lamp.

Well, I took another walk tonight, and took some real time doing "deliberate" comparisons as opposed to just casual observations, and I must change my theory to say that it doesn't seem as close of a "race" as last night.

HOLA was very clearly brighter to my Eyes/Brain.

:shrug: Who knows? maybe my Eye/Brain/Flashlight connection wasn't as good yesterday as it is today.

Dr.K said:

I wouldn't know the answer to that question, unless the MN16 and P91 have the same lamp.

Well, I took another walk tonight, and took some real time doing "deliberate" comparisons as opposed to just casual observations, and I must change my theory to say that it doesn't seem as close of a "race" as last night.

HOLA was very clearly brighter to my Eyes/Brain.

:shrug: Who knows? maybe my Eye/Brain/Flashlight connection wasn't as good yesterday as it is today.

Click to expand...

I know what you mean, it is hard to judge which light is brighter under certain conditions sometimes.

BTW: The MN16 is basically the P91 for a turbo head (M3T), it claims 225 lumens for 20 minutes. So it would give a tighter spot and rounder beam.