Need some knowledge.

So, I've been having a drinky think (sometime dangerous) about my current project (nothing special).
I'm giving an XHP50.2 80+ CRI a go so needed a 6v 17mm driver. Decided to go with mountain electronics and ordered a zener modded FET driver but noticed the zener mod option was not available on the FET+7135 driver.
Why can you only zener mod a FET driver and not a FET+7135? I assume it's down the current limiting 7135 but that's a (poorly) educated guess on my part. I then also started looking for real world data on the 50.2 and have now worried myself.
Apparently running the 50.2 in a 2S direct drive situation is a big no no?!?!?
Is this the case? And if so why?
If anyone can shed some 'light' (haha...) on the situation that would be brilliant.
Thanks
Thom.

I think the 7135s don't work very well at high voltage. It's possible, but not advisable.

The latest generation of LEDs, led by the Nichia 219C and including the Cree XP-G3 and XP-L2 has lower forward voltage than previous emitters. In a direct-drive configuration, these will pull much more current than older emitters and are often capable of damaging themselves through over-current. The XHP50.2 is in this category.

I guess I will just have to limit the use of turbo. I shouldn't really need it but it's nice to have. Hopefully a C8 will wick heat away well enough for short (20second max) bursts of turbo.

I think your better bet would be to try to limit current. Use thin leads and don't bypass the springs.

Hmm, the driver Spring is pre bypassed. Leads are quite thin though, tail Spring was bypassed but I may remove it. I'm a bit worried now.

Tests by djozz show the XHP50 getting 6A at 7.0V, while the XHP50.2 gets 10.5. I'm not sure what it takes to kill one, but 10.5 is peak output (5000 lumens).

So it comes down to the batteries. As long as you use something that can't deliver more than about [email protected], like just about any 18350, you're probably fine. Using 18650s, you could get into trouble easily, as many high-drain 18650s will stay over 3.7V for a while at 15A+. VTC5s will give you [email protected] briefly, and that would almost certainly be sufficient to kill an XHP50.2 in short order.

Well I've got no 18350's and only vtc5's......
Undoing the bypass on a mtn17dd shouldn't be too hard, I will remove bypass from tail too and hopefully Rt will be enough to keep current down. Alternatively I may buy some lifepo4's