Mechanical
Why does your quad w2 d4svn produce 4600 lumens and this quad w2 only does 2650 lumens?
Nice work Vinh! Definitely interested in this. Been following your website & Youtube channel for years. 
Likely low drain cell. I will try another unprotected.
Thank you!
Good observation. I would like to know the reason too. Thought it’s a FET driver.
Thanks Vinh-- I'm back alive! Again, nice work trying to destroy it. I will be surprised if a 9mm hit on the 7075 kills the light, as long as it isn't held fixed. If the light can absorb the hit by moving it should be able to survive it, but not without reasonable messing up of the finish, much like Phuong did with her burn-outs. It has the advantage of almost certainly deflecting one way or the other leaving energy in the bullet, and if you were to score an absolutely perfect hit on the peak of the radius you've hit it where it's strongest in terms of not deforming and should really send it for a ride, again, like the burn-outs did. Not exactly a practical test in terms of what might be a possible failure, but certainly impressive if it handles it. The 6061 the prototype is made of is very soft. If Phuong did the same thing to a 7075 version it would certainly scratch it up, but the big gouges you got in the 6061 would definitely not be there. As long as you don't mind messing up the finish a bit, feel free using it as a hammer.
So nice to hear from you Larry!I know you are super busy so very nice for u to drop by and join us.
At this point I will have to sacrifice a serial production 7075 sample. My military friend already got a military vehicle set up for the next level Run Over video. I will also start small with PCP air rifle then .22lr and up. If the light survives 9mm I consider it a major success. We have plenty of more potent calibers but that’s too optimistic. Cheers!
How about this one Vinh ——————- 
Need a SLN AR500 Steel version for that 
What a funny video haha Vinhs light prolly can handle only one of those bullets. I wouldnt risk shooting it twice. Haha
SL Nguyen Torture Test 7: 4000Lumen High Drain Samsung 30T
Not even …I don’t think any type of aluminum can handle any type of rifle round. Pistol caliber is one thing. Rifle round is a whole new animal. I shoot .223 green tip through 1/4” mild steel like butter.
Keep in mind max (discharge) operating temp for the battery is 80C and recommended is <60C. Hard to say how hot the battery was while doing this, maybe not 80C since you were outdoors but I am surprised it lived.
Yes the test went beyond all safety recommendations to prove the robustness of the light circuitry.
In practice with accordance to Sky Lumen Purchase Agreement all lights temperature should be monitor with bare hands and must be turned down several level or OFF once the light reach the “Too Hot To Hold” temperature. In this specific case, 2.5min was is the recommended time to throttle back.
In hindsight, the light forwards switch code name FS54 is especially impressive considering the circumstances.
I know…I was just making a joke haha
But you know If SLN survive 9mm which I dont think it will hahaha We might have to break out the S&W 500 just for KICKS!
I don’t laugh very easily, but I was laughing my butt off watching this!
Watching the video make me want to say. Get the hell out. I will show you how its done. hahahaha
SLN Heat Test 2 (Samsung 30T)
Starting 4000L 4.2V
Too hot to touch at 2.5min
Max temp @ 10min
End test 12.5Min
Ending 1400L 3.14V