I did a test, my 700g Trustfire X100 maintained 66 deg C stabily with 30 deg C ambient, 1.43A 16.5 volts from my PSU = 24 watts, light is horizontal orientation so that the fins are vertical and supposed to get some slight convection going. But this 24 input watts means 3.4 watts into each XM-L only, very efficient.
No way that 65 deg C is hand holdable. I tried, 2 seconds is the max I can manage. The youtube reviews, i think it was the Acebeam X45, was doing 165F or 71 deg C before thermal regulation. You’d drop the light nearly instantly if you accidentally tried grabbing it near the head area.
Tailstand-ed, still ok
For sure lumens :mass ratio is going to be a rough guide, hence why i just specified a range (1500-2000 lumens). That’s the easiest to gauge as we have that info easily from the specs and you’d get the answer within a few seconds of eyeballing the numbers.
Wattage:surface area ratio or mass theorectically makes the most sense, but it also depends on how efficient you think your LEDs are gonna be operating at the driven level, even if we are talking about the same LED type eg XP-L for the Q8 with the output at 3500lm and then at 7000 lm. Varies quite a fair bit, so that’d require a fair bit of work in mapping the lumens to the watt and also the efficiency of the LEDs between NW/CW. Not an impossible task, of course, just more work. You can also measure the wattage of the light, but that requires you to actually get the light first, or hopefully someone already has the figures. But no issue for the popular lights.
For me it such things aren’t super critical to get the exact figures of course, a ballpark figure more than enough suffices when trying to select a light.
Oh…this one chinese 7070 emitter light. I was shooting for 268rmb but the seller wanted 318 lowest. Single piece only though.
Someone did a test, conservatively it does 6500 lumens stock and 7.2% drop in lumens at 30s. The Sofirn Q8 comparatively did 6.x % drop at close to 5000 lumens. Not sure if the stock springs/driver would react positively to a spring bypass and electrical contact cleanings, if so 7000-8000 might be possible. Good enough for a 368g light. An olight X7 similar form factor is 9000 lm.
Post #328: I also found this one. They call it the Dongdonghai D8A. It may have a slightly larger reflector than the Astrolux MF02. Nice suggestion to use a XHP70 in it. But I would go for XHP70.2 and direct drive. There are some nice TA 30mm drivers.
Look at the flashlight again. The last option is a new one. It seems that is a 2S4P extension tube. Now things are getting really interesting! :sunglasses: The XHP70.2 listed here is the highest P2 bin: https://item.taobao.com/item.htm?id=568795758705
Nothing too fanciful, more of a thrower than a flooder with the decently large reflector and XP-L HI, so not sure where this 3 x 26650 would be useful (cheap-ass tripod mounted hunting light? ). 3P config though.
Shd be sufficient heatsinking + surface area for constant max level light delivery.
Looks is ok, throwback old school perhaps.
Overall shd pass for a budgetlight thrower just for fun/collection.
I have a couple of Palight years ago, pretty ok stuff.
Yeah it’s mighty difficult nowadays. Even Taobao 3rd party forwarders with “Sensitive Air” options are trying to ask customers to limit the number of Li-ion cells per consolidated package to around 12 max.
This makes me think a bit less of them as a company. I wonder if people are going to wrongly assume it has Cree emitters and can really do 12,000 lumen?
I have it. I like it, though I have little to compare it to.
Search this forum for “Severe Cold” to read more about it. No, I’m not kidding, “Severe Cold”.
LED is junk, driver is bad but host is OK and it has nice potential.
I’m considering to buy this light on Alibaba:
The host looks good with all those cooling fins. It is 1S configuration. Does anyone know how you can mod that to 2S and if it is easy to do that?
Huge!
[quote=Skylight]
I'm considering to buy this light on Alibaba: !https://abload.de/img/high-performance-heatrifpw.jpg!:https://www.alibaba.com/product-detail/XHP-50-rechargeable-LED-torch-light_60702801337.html?spm=a2700.7724857.normalList.1.3a895de1qQx3uz The host looks good with all those cooling fins. It is 1S configuration. Does anyone know how you can mod that to 2S and if it is easy to do that? !https://abload.de/img/htb1cpivx48x3kjjszpiqbheza.jpg!
[/quote]