C8 addicts thread

Looking in Wikipedia reminded me that heat conductivity is limited by lattice defects (such as atoms of other metals). Some metals are supplied in a heat treated or work hardened form. This extra hardness is caused by lattice defects (They interfere with slipping along crystal planes). So heating the pill after it has been shaped and letting it cool slowly my make a significant improvement in its heat conductivity.
This is the opposite of the way knives are made, at least sometimes. The annealed metal is worked, such as by filing and grinding with abrasive belts and then it is hardened, tempered and polished. I am pretty sure budget light manufacturers wouldn’t bother with this step.
The conduction mechanism is that more energetic conduction electrons move to cooler parts of the metal and vice versa. The rate depends on the mean free path, as for atoms in a gas.

if your driving your emitters hard enough, pills should soon get heat treated…… :bigsmile:

Might make a small difference, but Copper and Brass don’t need to be cooled slowly like a lot of other metals. You can anneal it by dropping it in a bucket of water, or cooling it 1 degree an hour, it will still end up metallurgically the same.

Id say the brass gets pretty hot in flashlights, would have to be over 100 deg C in a hard driven light I would think. Not quite enough to anneal it though :slight_smile:

Ben, sounds awesome.

Graeme came around last night and picked up some xml2 c8’s, the ones in the first post.

Took him outside with the 125k xpg, and a stock xml u2.

It didn’t look 6 times brighter, but I guess thats colour temps playing with you! Im thinking about dropping even on more colour bin for the next lot, the 6500 de domed is perfectly neutral to me, but I think going one more down will be better with tracking blood etc.

Working on a DD at the moment, its all hinging on if the factory switch can hold 4.something amps going through it.

Hoping for 100k XML2!

Chris

I didn’t get any reply from crnkin, can anybody help me understand his readings.
The highest I can get from my C8 is 25,000 Lux from my Lux meter at 1m.
How he got 115,260 lux at 1m where he shows 1807 from the meter.
:beer:

measured at 8 meters? that would be 115648 cd

Answered it a few days ago

Chris

Thanks Chris. Somehow I missed your reply or else I’ll not post again about this.
Not that familiar at all with this Lux data and still learning.
:beer:

No worries buddy!

Chris

wich AR lens for C8 besides de UCL?

kaidomain? fasttech ? IO ?

anyone has review of the other 3 ?

I have a Convoy C8 with a Qlite, a Xpg2 on a noctigon and an AR lens. Today I got a duel stage Xpg reflector to try out. Unfortunately when I put the reflector in the emitter was pulled off. I think the hole for the xpg is so tight that it caused the problem. I would like to replace the XPG and try the reflector again but don’t want to have the same problem. Any sugestions?

I just built an XPG2 C8 with OP reflector from KD and a 5xAMC driver from FT. Well after tweaking the pill height vs reflector it gave out a bright and well focused beam. Smooth too. I don’t have a lux meter but after a try outside, C8 vs Armytek Predator 2.5, I can’t say C8 is much behind of Predator. So it appears the $60 difference is all for the build quality I paid for Predator. I feel somewhat guilty. :slight_smile:

I can justify $40 quality light vs a C8, due to better builds, water resistance, body strength, modes, efficiency etc. But if you want a small size thrower, a C8 can still beat the lights a few times more in price.

I just built an XPG2 C8 with OP reflector from KD and a 5xAMC driver from FT. Well after tweaking the pill height vs reflector it gave out a bright and well focused beam. Smooth too. I don’t have a lux meter but after a try outside, C8 vs Armytek Predator 2.5, I can’t say C8 is much behind of Predator. So it appears the $60 difference is all for the build quality I paid for Predator. I feel somewhat guilty. :slight_smile:

I can justify $40 quality light vs a C8, due to better builds, water resistance, body strength, modes, efficiency etc. But if you want a small size thrower, a C8 can still beat the lights a few times more in price.

I was wondering have any of you guys found a replacement tail switch for the c8 that can handle higher amps? I have ruined two of them with a build I am doing with a red phlatlight direct driven from ncr18650pd battery.

mhemling, see this thread.
:beer:

Thanks for the link!

LMC12XML2 today. And partly because of your short review and posts. Thanks Tim

got my first c8 the other day, the banggood 8.88 xml t6, and i like it.
its bright, throws well and has usable spill, the only downer is a hollow pill?? star only sits on a small edge so i wouldn’t run it on high for a long time. oh and the next mode memory, i hate it its s frustrating its my first light with it |(

i also have the convoy c8 on the way. im very interested to compare the 2

I have both the C8 from Banggood and the Convoy. You will be much happier with the Convoy. The quality is much better.

for 8 bucks i like it :bigsmile:

i just posted in the bangood 7.99 c8 thread, im interested to see weather yours has a hollow pill and what amps yours pulls on high?

I agree it’s not bad for 8 bucks. The pill is hollow and I pulled the switch out and it looks kinda cheap to me. I tried getting measurements on high and the best I got was .87A but my DMM is a turd from HF so I have no idea if thats acurate.