A good entry tatasal. daninho reviewed that light here on Sun, 11/06/2016 - 19:25.
Finding that only 4310lm could be gotten out of it on its highest mode, with the good keeppower 3400 batteries that were put in it. Then as you can see here > Review Niwalker Vostro BK-FA02S
The chart shows a steady decline, due to thermal regulation.
To win this, a flat line will be necessary. :sunglasses:
It could have been tested starting out in its second highest output level, for more runtime, but that would have only been level 4, at 1900lm. So really, in order to win this. We’ll have to find a flashlight that has a mode of around 4100-5000lm. To beat this K60.
Oh, nice find of the review. Now I am more informed.
Well, in that case I find a gradual decline much better than the nowadays almost universal marketing hype of so much lumens only to step down so steeply. :person_facepalming:
Very good, and all true Enderman, but you will have to admit. Leaving the batteries aside for a moment, and the air space they inhabit. Screwing on an additional 226 grams (Maker MK35 battery tube and cap as an example) of solid aluminum, onto that heat sink Olight X6 flashlight you are showing us here, is going to help some with heat dissipation. :+1:
Head dissipation does not depend on the amount of mass.
It depends on the heat dissipation due to surface area as well as heat conductivity of the material.
Simply adding more metal does not help, it just makes it heat up slower due to a large heat “reservoir”.
If you care about continuously running it for long amounts of time, it should have many large fins (like a CPU cooler) with decent spacing between them for air convection.
You are again correct Enderman. Maybe I was not making myself clear?
In my mind, when adding that additional mass of 226 grams of aluminum, I was also adding it as a battery tube or container. That container also has a surface area. In this case, that surface area is an additional 220 sq/cm. So along with the mass, in my figuring, comes the additional surface area. Thus, additional cooling.
Well placed fins of course work better though, as you said. This additional surface is just that though. Added surface area. Not the most well placed, but surface area none the less, and helpful. In my OP, I stated: - “of course going to have to be a pretty big flashlight, with more importantly, some real decent fins on the thing, and some real BTU extraction capabilities.”
Mass of course is key, the x65 has it in abundance……………but the xhp35 HI’s do not help! These i find run hot, or hotter than equivalent outputs with different LED’s with lower voltage.
The x65 can run around 5000lm till the 8 cells say no more………….gets toasty though compared to the rc40 at similar levels.
Not only is the battery tube very far away from the heat source (the LEDs) and therefore reducing the effectiveness of the surface area, but the cross-sectional area of the battery tube is very little, causing bad heat conductivity, AND 220sq/cm is nothing compared to the 1000+ from 10 heat fins 100mm in diameter.
And yes, the X6 has more than 10 heat fins.
No, no it is not.
Mass does literally nothing for heat dissipation, it just stores heat.
Surface area is what matters.
Adding mass just makes it heat up slower, over time it will still reach a high temperature.
If you care about long continuous runtime at a lower temperature, then surface area, metal heat conductivity (copper is best), and airflow speed/temperature is what matters.
Mass,size , metals used etc. All helps take heat away. When I hold an rc40 it has more mass, it can run longer than a light with less mass/size at similar outputs. Yes mass matters to me , larger the light with more heat sink works better than one with less mass/heat sinking.
Maybe if all you use are the typical normal-shaped flashlights that would apply.
But no, depending on how you shape the metal you can have something with the same amount of mass and 100x the surface area.
But we are on a Flashlight forum, I am simply saying larger lights handle heat better (generally speaking) than smaller ones at same ouput levels. More mass/size/ heat fins to soak up heat then dissipate. Which I have found enough to sustain fairly high output levels for decent amounts of time.
Tk75 and K60 do not handle heat as well as a larger light like the rc40 at similar outputs.
Flashlights, spotlights, searchlights, we talk about all of them here.
OP didn’t specify just tube flashlights or EDC or anything like that.
You don’t seem to understand that there are lights with different designs that aren’t your typical “battery tube with big head” and actually have better heat dissipation, higher output, higher price, etc.
Oh well, the op’s main beef is “what light can sustain the turbo or its highest level without stepping down and will only notch down due to battery depletion”.
How it can do it is not the issue and perhaps deserves another thread.
