How about setting the comparison metric to lumen-hours per mAh for a range of output?
Dale I wish I had your skills to make my J20 like that. Very impressive as usual mate.
Now with that, I have to disagree with your conclusion Enderman, You are of course correct though, when you state that “tube very far away”, and with “cross-sectional area of the battery tube is very little”, and also with your “causing bad heat conductivity” statement.
But, it is in addition. As an example here. The 220sq/cm is in addition, to lets say the 1000+. So lets say that is 20%. Of course its location is not prime real estate, near the emitter shelf. But additional none the less.
I have seen far too may thermal imaging tests of flashlights, to not know that the battery tube goes a long ways towards drawing heat away from the head.
We also have many other examples of how this works, but lets keep this thread on target. :+1:
Great choices DB Custom! I would love to hear what you find out.
Someone else here mentioned the Acebeam X65, which is a pretty big, heat dissipating flashlight, with a 6000lm level. It’s going to be close, but that one just may do it?
I have an Acebeam X45, with a 4000lm level, that will keep that pace for about 1.4 hours. So we could throw that onto the list as well. But I have not been able to find anyone who has documented its OTF lumens. I suppose it is pretty close to 4000lm, when on that level.
No, it doesn’t have to be LED Angler, but LED is what I had in mind. 
We’ll keep two lists. One for HID, and one for LED.
I think Enderman is going to track down some reviews, or charts, or specs, in order to calculate just wear some of those land in all of this.
Do you have some you’d like to add to the list, with specs and charts? We will need some sort of testing documentation.
Thanks again ven. Can you bring some review testing or charts here, for that flashlight. So we can all see and compare? :sunglasses:
Thanks Richie086. 
Can you get us some spec sheets or run time charts, and bring them here, so we can take a close look and compare? Are those both able to run 4000lm or more, over the life of their batteries, and not step down?
A great idea, and I was thinking about that as well. :+1:
We will do that, later scs. When we get say, a top 5, or 10 list. Then we’ll break those down by lm per mAh. Would you like to help us with that?
For now, here. I’d like to try and keep it simple.
What flashlight(s) can we buy, that will sustain the highest number of lumens, for the life of the battery pack, without stepping down due to a timer or thermal regulation having to be set, to keep the temperature within reason. “Within reason” being, not doing permanent damage to the flashlight, as set by the OEM manufactures. On most flashlights I’ve seen, this will have to be done on the second highest output level. We are looking for over 4000lm now. That is the benchmark so far.
Part of my goal here too is. Keeping this in front of mind for us, and for flashlight manufactures going forward. Let’s not all forget about sustainable lumens.
Just the one on CPF which shows up on google when you search “olight X6” (i can’t put the link here because the forum breaks it) It’s not a cheap flashlight, so most people don’t buy stuff like this.
No, it is not.
We were comparing the X6 to regular tube flashlights.
Rather than having a battery tube the X6 has a massive heatsink there.
It is not “nothing vs battery tube” it is “massive heatsink vs battery tube” and obviously the heatsink can dissipate far more heat while not requiring additional weight/mass.
My entire point is that there are flashlight designs that have far more effective cooling than the typical tube flashlight that people see around here.
I guess I shouldn’t expect people to know this stuff since it’s a budget flashlight forum and all the lights I’m talking about cost hundreds or thousands of dollars.
Are you sure to know that this forum being about budget flashlights implies that there are no folks around here who know their stuff? 
There are less, not none.
For example, the people who only ever care about EDC lights under $10 and think badly of people who buy expensive flashlights.
I think you refer to quite a minority of BLF, and then, there’s no reason why even those people can’t be knowledgable about heat flow in high power flashlights 
Half the people here will see a $300 surefire flashlight and say the worst things they can think of, as if surefire had insulted their mother or something.
You mean how apparently mass = heat dissipation? Sure, whatever you say.
Enderman I don’t get your point, OP asks for something specific and people answer with expensive lights that do just what is asked for. I don’t see hate or negativity towards expensive lights here on BLF just a friendly pointing to lights that costs less, ergo offer more lumens for the dollar if such lights exist, if not (in case of a TN42 for example) people accept that and get it if one needs or thinks one needs such a light. For expensive can still be true value.
Mass= weight distribution, nice twist on what’s said. I can’t even be bothered anymore, only thing that seems to be guaranteed in threads with you posting in being ruined . As your obviously a know it all, never wrong and won’t listen to anyone but yourself. Seems to be a strong pattern with pretty much every thread you post in.
Over and out.
Well put, Ven!
Fenix TK75,
I have one with two extra tubes. If connect them together, they standed in 4000lm for few hours (hot but touchable).
i think there is at least one light out there with an internal cooling fan…
too lazy to look it up though
something with a strong handle
Yes that is a Russian beast if I remember correctly
But non of them were produced…