Don’t mind me for sidetracking a little from the TN36L, let me share some practical info.
My father in law’s plantations and birds nest caves do have such a need for prolonged usage of up to 30 mins, though at half the lumens.
I posted a similar thread, 9-12k lumens for 10 mins, but with an extra condition that it can be hand carried so the tube temps cannot exceed 110F or 43C else there might be a risk of muscle tissue damage. Seriously if you’d personally try 43-44 deg C range with your bare hands for just 2-3 minutes, i can almost assure you that your hands would feel “funnily injured”, as in temporary heat injury. 43-44 deg C range 2-3 mins may not sound like a lot, but just try it, you’d be surprised on how uncomfortable it can get. Personally i am unable to hold on to anything for longer than a few seconds once comfortably past 45-46 deg C, and it gets worse once you pass the light between your left and right hand as your tissues gradually heat up with further contact. Eg, trying to unscrew the head of the Q8 at 50 deg C and body at 42 deg C, i have tried it multiple times via various techniques but failed to smoothly do it.
Don’t take my word for it, try it yourself and measure with a IR thermometer and see how it measures up for long-term practical usage. I know we are all flashaholics and we love lights, but personally i don’t feel the need to risk things also, same goes for li-ion safety. Some may feel differently, of course.
Additional medical info in detail
Predicted times to reach muscle necrosis over the temperature range from 37–50°C, based on data by Meshorer indicating that 30 min at 43°C is sufficient to cause damage to muscle
So what you really need is some sort of insulated handle, like the Acebeam X70. This way things can get really hot but you still can handhold it for prolonged usage.
Either that or you’d need a sling.
Ok……for lights that can reach that level or close to it, you can get the longish metal cans HID on aliexpress. Those things have been around since 2010, a 85/100W version should be able to hit at least 7000 lumens. They have slings so the heat does not really become an issue. However, the 3S3P battery packs are literally like pipe bombs and i don’t think the stock China cells are going to be anywhere even near middle-drain type , so yeah they are going to be get hot and dangerous once you do continuous esp as the pack ages with continued usage. I know some stores can offer to wire it up with Panasonic NCR cells (I enquired before), but then they are bloody expensive and besides there are no guarantees that they are going to be using legit cells and not re-wrapped cells, so……. it’s really better that you DIY.
They are not terribly expensive, but the beam hotspot is really not that good, so probably they are more suited for close-up and moderate ranges work.
There are probably other specific LG/Samsung/Sony cells that can offer this level of abuse protection, but just sharing info on the Panasonics with an old youtube vid.
This aliexpress seller claims to have Panasonic and Sanyo packs. Unfortunately, most of the time aliexpress is expensive.
https://www.aliexpress.com/item/Hunting-tactical-flashlight-Led-85W-high-power-8500Lumens-HID-lamp-beads-brighter-than-XHP70-LED/32847601789.html?spm=2114.search0104.3.8.632e613d6laVJD&transAbTest=ae803_5&ws_ab_test=searchweb0_0%2Csearchweb201602_5_10065_10068_5731315_318_319_317_5728815_10696_10084_10083_10618_452_10307_532_5731115_5731415_5731215_5731615_204_328_10059_10884_5731515_323_10887_100031_320_321_322_10103_5731715%2Csearchweb201603_55%2CppcSwitch_0&algo_pvid=dec4a67a-ecad-4ceb-96b3-4cd44909f105&algo_expid=dec4a67a-ecad-4ceb-96b3-4cd44909f105-1
For those who are able to do 3rd party agents with Sensitive Air shipping (due to li-ion cells), just get it “directly”. eg it’d cost 73usd for me to get the one with 7800mAh batt or 94usd with 10400mAh pack, both using brand name cells (haven’t asked seller which brand) and usd64 for China cells, and about 8usd shipping. Not sure if the brand name cells are re-wrapped from lousier cells, or legit cells from decent battery pack pulls. So you might wanna consider to DIY if you value safety as high priority?
https://item.taobao.com/item.htm?spm=a230r.1.14.27.15871798seSeEl&id=557660301785&ns=1&abbucket=12#detail
