Malkoff "Hound Dog"

[Modernflame]

It's a fairly accurate representation. The hot spot is slightly warm, surrounded by a very warm (almost yellow) central ring, which in turn is surrounded by a noticeably cooler spill area. This is really noticeable on a white wall, not so much in outdoor use.

Tiny bit of purple at the fringes. Someone on this thread pointed it out to me once. Never would have seen it otherwise.

 

[INFRNL]

I finished the HD MD3 primary test. Got some interesting and weird results. I will add them to the other post. Never seen anything like this before

 

[Jose Marin]

I finished the HD MD3 primary test. Got some interesting and weird results. I will add them to the other post. Never seen anything like this before

That quick drop in output and then a slow climb was most likely the cr123s over heating then recovering. I had something similar happen when i was testing runtime on m61hot with 2x cr123. Could barely rouch them with my bare hand they were that hot

 

[etc]

I've decided to continue the test. I forgot to mention this but most people that know me, know that all my lights are of the Neutral variants

MD3: Same cells rested but not topped off(2000mah sanyo/panny). Initial test was inside with ambient temps around 70-72 deg F. this test in garage, ambient temps around 60 deg F and a fan sucking air across head. Running temps around 110-118 deg F during test.
Peak: 1036 lumen(just did a retest because it was forgotten, fresh cells 4.2v ea)
5 min: 986 lumen
10 min: 977 lumen
20 min: 969 lumen
30min-1hr: 966 lumen

Light cut out just a couple minutes after 1 hr. weird thing is I saw lumen jump to 970 just before the light cut off.

MD4: same cells topped off(3500mah panny GA cells): ambient temps around 60 deg F and a fan sucking air across head. Running temps around 110-115 deg F during test.
this time output peaked at 1038 lumen and dropped to 1010 lumen not sure why this changed this time around

5min: 989 lumen
10min: 984 lumen
15min: 979 lumen
20 min: 977 lumen
30min-2hrs: 976 lumen

Light cut off at 2hrs 2 min final output was 979 lumen

Apparently just before the light cuts out it produces just a hair more output before it dies. wouldn't be noticeable to the eye but is definitely evident on a meter.

Hope this helps answer any questions/concerns for those curious. I guess this test wasn't quite apples to apples (since i didn't top off the 18500's) but still applies to the initial 5 min test that there is no noticeable difference between these 18500/18650 cells for output. The eye should not see any difference in the minor variation of output between MD3 and MD4. I believe there needs to be a 25% difference in output for the eye to notice a difference (please correct me if i am wrong on this as I do not recall exactly)


EDIT:
HD 18650 MD2 current version: 18650 GA 3500mah cell
Starting voltage 4.2v, ambient temps 57-58 deg F, fan sucking air across head. Approx running temps 100-110 deg (I forgot to get initial temps but approx halfway through it was around 100deg)
I was busy today and had some distractions as can be seen in time stamps

Peak: 920 lumen
1 min: 902 lumen
5 min: 904 lumen
10 min: 888 lumen
15 min: 867 lumen
20 min: 843 lumen
25 min: 826 lumen
30min: 805 lumen
41min: 737 lumen
45min: 718 lumen
50min: 686 lumen
1hr 10min: 592 lumen
1.25 hrs: 564 lumen
1hr 20min: 539 lumen
1hr 25 min: 509 lumen
1.5 hrs: 472 lumen
1.75hrs: 329 lumen
2hrs: 194 lumen
2.25 hrs: 104 lumen
2 hrs 25min: 73 lumen
2hrs 55min: 23 lumen
3.25hrs: 13 lumen
3.5hrs: 8 lumen

Ended test but this should give you an idea of what a single cell will provide

EDIT 2: MD3/MD4 primaries(streamlight) starting voltage of all cells was 3.28v

MD3 Peak: 1042 lumen
MD4 Peak: 1042 lumen

MD3 on Low, 18500's 4.2v ea cell (test is too long, so i am going to try and keep it to a minimum)
Peak: 66 lumen then instant drop to 65 lumen
5min: 65 lumen
There was a strange drop between 1hr 50 min to 2 hrs 64 lumen@ 1hr 50min to 62 lumen@ 2hrs
3hrs: 59 lumen
4hrs: 57 lumen (@4hr mark, it appears we are now entering a 1 lumen drop per hour)
5hrs: 56 lumen
Ended test at 5 hrs cause it was 2am: cell votage was @3.91v ea continued test @8am
6hrs: 53 lumen
7hrs: 52 lumen
8hrs: 51 lumen
9hrs: 50 lumen
10hrs: 48 lumen
15hrs: 44 lumen
20hrs: 35 lumen
21hrs: 33 lumen
22hrs: 28 lumen
23hrs: 18 lumen
23.25hrs: finally cut off but i did not get a chance to see what final output was
MD4 should yield approx double of this MD3 test on low mode
If 20+ hours is not enough, then we have issues. I will do one last test: MD3 primaries on high mode. and if you are lucky, I might go to lowes and get some surefires to do the MD4 high mode test but I WILL NOT BE DOING ANYMORE LOW MODE TESTS of any sort.

hope this helps those that were curious
MD3 w/streamlight primaries. Starting voltage 3.12v ea cell (so this test may not be as accurate as it should be) Ambient temps: 60 F

Peak: 1021 lumen then immediate drop to 1010 lm
1min: 1003lm
5min: 987lm 105F
10min: 968lm 118-120F
15min: 958lm 126F
20min: Huge drop to 350 then instantly to 250lm
25min: 248lm and starting to climb
30min: 289lm 105F
35min: 332lm 100F
40min: 347lm 97F
45min: 362lm 95F
50min: 372lm
1hr: 388lm 94F
1hr 5min: 400lm
1hr 10min: 417lm
1.25hrs: 469lm 95F
1hr 20min: 530lm and climbing fast 97F
1hr 21min: 630lumen
1hr 22min: 650lm and dropping fast
1hr 25min: 535lm and still dropping fast
1.5hrs: 318lm and still dropping fast
1hr 35min: 154lm
1hr 40min: 90lm
1.75hrs: 58lm 85F
1hr 50min: 33lm 76F
2hrs: 22lm
2hrs 5min: 17lm
2.25hrs: 13lm
2.5hrs: 10lm
2.75hrs: 8lm
3hrs: 6lm
3.5hrs: 5lm
4hrs: 4lm
4.5hrs: 3lm
ended test for the day but cells were not drained.

This is an excellent analysis.

Would it be possible to put this in a chart? A graph? Anyone?

Thank you very much.

 

[INFRNL]

This is an excellent analysis.

Would it be possible to put this in a chart? A graph? Anyone?

Thank you very much.

If i knew how, i could have. I left some time stamps out too, but i think I got all the important readings.

@jose, thanks for the input. I honestly did not touch the body or cells. I also do not usually test primaries, so i have no idea but your logic makes sense.

At that time of the test, i do not think temps were too high but that doesn't mean much either.

I will see how much lowes wants for the surefire cells. I would be willing to rerun the test with a fresh set of cells.

Sadly those cells are still alive and have been running forever. I ran them down, let them rest, been running since last night. Probably only 1lm but it would be enough to get you by in an emergency

 

[twl]

After many years of using HD V1, V2, and V3, I find the V1 to be the one I select most often. Throws just as far as the others to my eyes in the real world and uses an MD2 with good battery life, great tint. Not as much side spill as the XML/XML2.

Nothing wrong with the others, but the V1 most often gets in the pocket.

 

[INFRNL]

Unfortunately I was not into lights so much back then and didn't even know about malkoff. I just started at the beginning of 2017.

 

[archimedes]

Re: Malkoff "Hound Dog"

Can we keep the primary cell discussion in one place please ... let's just do that over in the other thread. Thanks

 

[INFRNL]

Re: Malkoff "Hound Dog"

Can we keep the primary cell discussion in one place please ... let's just do that over in the other thread. Thanks

ok, sorry Archi. I removed that part from my post.

On a side note, I think I may be able to come up with a graph for my runtime tests.

I also went to lowes and picked up a 12pk of surefires. I cannot guarantee when I will be able to get around to everything but will try to get to it in a timely manner

 

[archimedes]

Re: Malkoff "Hound Dog"

ok, sorry Archi. I removed that part from my post....

Thanks, that just helps keep a single discussion from getting scattered over multiple threads

 

[INFRNL]

Re: Malkoff "Hound Dog"

Work in progress. If I knew what I was doing, this would be much easier. I don't know how to post the pdf file or excel file; so i took a poor quality pic. Imgur really takes the quality away too

 

[xdayv]

Wow, that is a useful graph! Thanks for the efforts. Can you possibly export the PDF file into a jpeg file, then post it here?

 

[INFRNL]

Wow, that is a useful graph! Thanks for the efforts. Can you possibly export the PDF file into a jpeg file, then post it here?

I still have more tests to add in, but it was a trial run as I have never done anything like this before.

If I knew what I was doing I might be able to do as you mentioned. I will see what i can come up with but I have to get ready for bed and i actually have work tomorrow

 

[xdayv]

I still have more tests to add in, but it was a trial run as I have never done anything like this before.

If I knew what I was doing I might be able to do as you mentioned. I will see what i can come up with but I have to get ready for bed and i actually have work tomorrow

BTW, the graph you updated on the previous post is good enough. Asking permission to grab it.

Goodnight!

 

[INFRNL]

BTW, the graph you updated on the previous post is good enough. Asking permission to grab it.

Goodnight!

yes you can use it. I will try to add all of the tests on there as long as it doesn't clutter it too much. Here is the pdf converted to jpeg (I might have to resize it) quality during the conversion did not turn out well, then to host it makes it even worse

When i am all said and done, If someone with more experience can take the excel file and post it properly or even convert it; they will be more than welcome to have it. For the time being, i will do my best to post a decent image

 

[etc]

The graph is very helpful.

 

[marco.weiss]

INFRNL, thank you so much for your dedication and helpfulness in performing the runtimes and translating them into graphics. I suggest you post the graphics to a Google Docs or Dropbox account. I have a question: what brand / model of luxmeter did you use? Which device do you recommend?

 

[Modernflame]

yes you can use it. I will try to add all of the tests on there as long as it doesn't clutter it too much. Here is the pdf converted to jpeg (I might have to resize it) quality during the conversion did not turn out well, then to host it makes it even worse

You realize, at this point, that with your experience, equipment, and Malkoff collection, you could start your own dedicated Malkoff Junkie website with extensive reviews of the whole catologue. Maybe you just need a camera? I suspect NH Lumens could help with that.

 

[etc]

From the graph, the 18650 HD has some advantage over MD3. Instead of dropping off the cliff like MD3 does at about 1 hour mark, it keeps going to 2 hours and beyond. Albeit at reduced lumens. This is nice.

However, an interesting test would be 18650HD running off Li-ion (or 123) versus MD3 running 3x123. The latter does not cut off at a single point should enjoy relatively gradual decline as batteries decline? Do I understand this correctly?

So, HD 18650: Lower lumens, longer runtime. I would rather have 200 lumens at 2 hours versus none at all for the MD3 variant.

The favoritest HD of mine is still the 2x18650 as you get the longest flat runtime possible.

And just to be the devil's advocate, what does this graph look like on 3x18650?

 

[INFRNL]

I'm driving so I'll have to respond to everyone later.

But modernflame may be onto something. We need a dedicated runtime thread. All the tests get buried and we (I) can't ever find them, it's too hard.

The unfortunate part is I got rid of quite a bit and can't redo a lot of the tests. Some modules (nichia) can't be bought anymore either