Convoy L6... XHP70 Beast!

I haven't been game enough yet to just leave my L6 on in different modes to test how long it really runs.

I ran my L6 on the highest setting for over a half hour sitting on my bench with no cooling. It was pretty warm but still easy to hold and it didnt step down. I had done the spring bypass but no mod otherwise.

I have also tryied run mine on highest for a long time, yes it gets warm but no way near that hot as the emisar d4 for example gets and its impossible hold without almost burning, but ofc i would never leave the light on highest unattended and go away. I was kinda scared before i got mine how people said here it quickly gets hot, thats not true at all the head is quite big and manages the heat very good if uask me and having it on for a long time doesnt feel like its an issue with heat really.

You were probably reading about the highly modded L6’s. Simon has run tests of letting the stock light run on turbo for an hour with no air circulation. It gets really hot, about 60° C IIRC, but levels out then starts to run cooler as the batteries drain.

On my light doing 17A, it’s a different situation. It would burn you after 2 minutes. I dont even let it get that hot. Maybe 30 seconds on turbo at most (with fresh batteries).

The stock light is not bad at all.

actually it said on gearbest specs where i bought it from that it can reach 80-90c on highest if left for too long i guess a silly typo?… but yea ok modded i can understand its a different story JasonWW.

It might have been 80° to 90°. It’s been a long time since I read this. It was hot enough to burn you. But it’s also a worse case scenario, because the act of holding it wicks away some heat and any type of air current also helps to keep the temperature under control.

Ps, I’m a °F user, not a °C user, so it’s hard for me to relate to Celsius numbers. :disappointed:

Yeah i understand JasonWW no problem :smiley:

Just got an L6. I think I like the Q8 a little bit more but it does seem to be less able to maintain max output than the L6.

well the l6 has a bigger heatsink and head so that shouldnt be a suprise, also a lot more compact, they both are great lights tho but yeah it would be ideal if the q8 could handle heat like the l6…. lumens and heat isnt easy to solve.

It’s two different power levels. The stock L6 is about 3,800 lumen and the Q8 is 5k+ lumen. So about 40w to 60w. That’s 50% more heat on the Q8.

I see. That’s probably why I was a bit more wowed with the q8.

The xhp70 in the L6 is pretty much 4 xpl emitters crammed together. So both lights are capable of similar output. The Q8 has a FET driver which pushes them hard. The L6 has a linear or constant current driver and doesn’t push the emitter as hard.

Now if you swapped in a FET driver to the L6, it would be putting out about the same 5,500 lumen as the Q8.

So they are actually quite similar. One is just a 4 x 18650 light and the other is a 2 x 26650 light.

If you swap the Q8 over to xpl2 emitters you’d get about 8,500 lumen. Same thing with the L6. Swap in a xhp70.2 along with the FET driver and you get about 8,500 lumen.

I hope this gives you a better understanding of the two lights.

How would sanding the base of the OP reflector affect throw? I’m wondering how much there would be to gain by focusing it like is done with the SMO reflector. Has anyone tried this yet?

Thanks for the excellent explanation.

All I know is if I put in charged batts and push the switch, light goes out one end. :slight_smile:

The difference will only be seen with a lux meter. You won’t see it with your eye.

Here is my SMO reflector with the stock spacer and then with the spacer removed, the bottom taped up to prevent shorts and the reflector lowered a tiny bit. It basically makes the corona smaller. The light from the corona goes into the hot spot.

Your much better off doing the resistor mod or swapping to a SMO reflector. Those are changes that you will actually see a difference with your eye.

Thanks JasonWW! :slight_smile: That’s good to know. Any idea how much better the L6 SMO reflector will throw than the L2 with the same emitter?

No, but it’s larger size does make a difference and gives you an increase in throw. I’m sure there’s other people here that can give you some exact numbers, but I don’t have an L2 so I haven’t done any tests using it.

Thanks for the input. I’ve been thinking of building an L2 or L6, but can’t decide what to build. Lately I’ve been thinking both: L2 with 2 cell tube and xhp50.2 for a nice all purpose light, and an L6 with single cell tube, xpl hi, and smooth reflector.

sry nevermind, i thought the q8 also had 4000 lumens… u learn something new everyday :slight_smile: and yeah q8 is using multiple emitters so i can understand that body host gets warm as hell on highest.

L6 uses multiple emitters as well. The same exact dies, capable of the same exact power. It’s just different drivers responsible for the different brightness.

The Q8 emitters are spread further apart, the L6 emitters are close together.

The Q8 draws about 15A at 4v.
The L6 draws about 5A at 8v.

If we convert the L6 to 4v the amp draw becomes 10A.

So Q8 15A
—— L6 10A

These are the rough numbers I was using to get the reason the Q8 is brighter and hotter due to its higher amp draw.

Now if you want to get real numbers, if you bypass the springs on the Q8 and run Sony VTC6 cells, it can pull 21A and do 6,375 lumen as tested HERE by Tom E.

The L6 with a FET driver, stock xhp70 and Liitokala cells can pull 12A at 8v. That is 24A at 4v.

So Q8 21A
—— L6 24A

Pretty darn close. I would actually expect the Q8 to draw a bit more amps than the L6 due to its stronger batteries.

4 x 3,000 = 12000mah Q8
2 x 5,000 = 10000mah L6

Stronger, higher mah cells generally equate to less voltage sag and higher amp draws. To account for this reversal in amp draw, I’m guessing the L6’s higher voltage (4 emitters wired 2 in series and 2 in parallel) must create lower resistance in the driver FET as well as the wiring and circuits. Maybe a more experienced member here can explain the difference.

Now if we swap to lower Vf emitters like xpl2 on the Q8 and xhp70.2 on the L6 (same basic dies) then the amp draws will jump up again along with output.

DB Custom has swapped to xpl2 on his Q8 and figures it’s pulling about 30A and measures 10,200 lumen.

On the L6 I’ve seen 18A at 8v which about 36A at 4v. At these power levels the 4 dies being so close together seems to produce more heat and lower efficiency. So output is only about 9,000 lumen (assuming a top bin emitter).

So Q8 30A (might be higher, it’s hard to measure)
—— L6 36A

Aren’t flashlights fun? Lol


If anyone sees any issues or has questions let me know.

I left a lot of tiny details out just to keep this post “short”. :wink: