Also, ask Wuben if they are willing to use a 4000k 80CRI XHP70.2
Would make for a dope light.
@Pete, I doubt that it would step down as quickly. It is using a more efficient LED array(4x XP L2s vs 4x Nichia 219Cs), a boost converter, and isn’t overdriving the emitters to their limit, unlike the 219Cs.
It also has a bigger body, meaning it could hold the heat for much longer.
The fact that they claim 4200 lm output leads me to believe that it’s XHP70.2. The XHP70 is only rated at 4022 lm, unless maybe if you overdrive it, which I hope Wuben will not do.
I chatted with a sales assistant at Wuben and it will be the XHP70.2. I have owned a few Wuben lights and two of the XHP70 models had the XHP70.2 emitter. I won’t expect anything less from Wuben.
Yeah I didn’t think of that. As far as I know it’s the 4000mah cells that can handle higher continuous current draw, like 20A and higher. Maybe there’s another new type of 4800mah cell on the market? I would like to see how the first reviews look regarding the current draw.
I asked if it’s a Samsung cell earlier in this thread and did not get a response.
As for current draw, the specifications for cree xhp70.2 say max power is 29W. At 4V, that would mean 7.25A current, plus some heat transfer losses I guess. Or am I not understanding the specs correctly?
That’s just the manufacturer specs. You can push a XHP70.2 much harder. I’ve seen Convoy L6 mods that push 13A through a 6v XHP70.2. The problem we see is that a single cell might not be able to supply enough current to the LED to emit 4200 lumens because it has a boost driver circuit. And you get voltage sag across a battery when drawing current. And when drawing high current to keep the XHP70.2 happy the driver would have to increase the current even more! So let’s hope it’s a decent cell. I’ll rather go for a lower mah rated cell that can supply enough current so that I can have constant current being fed to the LED.