I know this has probably been discussed, but i am having a hard time finding a answer. If I run a 17MM FET Driver with 3 7A3 tint XP-L leds, would i be better off running series or parallel on the MCPCB for the leds?also say i was running a 7135x12 Qlite driver, parallel would be like 1.5a per led right? how many amps would the emitters get in series?
If you are running a single cell with the emitters in series you will get 0 amps. You are correct on the parallel current distribution. Does that answer your question? 
:bigsmile:
What RMM is playfully saying is that one battery can not supply enough voltage to run the LED’s in series through a linear driver.
ahhh okay. i happen to have a 7135x16 zener modded driver and 2 IMR 18350s. lol. but yeah, that was what i was trying to figure out. thanks!
2 freshly charged 18350s ought to get you a nice moonlight mode with the emitters in series. 
is the 7135+fet driver Zener compatible?
wonder how hot it would get on high? lol
i really wish i could get a hold of some of the 90 CRI XP-L emitters without having to buy 100 of them from mouser.
How hot would it get? Uh, not even warm. How hot do most of your lights get at a moonlight driver level? 
Yes it is zener compatible, but in its current configuration you have to put the capacitor on the zener pads then stack the zener.
Nick, 3 XP-L’s in series works out to essentially a 9v emitter. So you would need 3 cells in series (or a boost driver) to drive it normally.
It’s a hassle and that’s why most people just use the emitters in parallel.
Richard is feisty today haha
Chalk it up to sleep deprivation and a Super Big Gulp®. That, and I know Nick wouldn't get offended by a few snarky comments.
I think we all appreciate some good snarkiness from time to time 
it takes alot to bother me lol. and yeah i was thinking that after i logged off. had me confused. if you can run 15 XM-L emitters off 4S batteries, i though 2S would run 3. i guess i will run parallel
the 15 emitter lights are probably in 3s5p or something similar, not all series.
yeah they are and it had me wondering if it was possible to do the same with 3. 2s1p, 1s2p? i dont even know. im just thinking out loud. lol
3s batteries would run 3 in series though… i could run 3 18350s in a Solarforce L2 host…… i have a extension tube for a single 18350 plus it will hold 2 in place of a 18650…….
Yes.
You might have to use a different zener though? RMM would know better than me.
hmmmmmmmm
The Zener remains the same but the resistor is changed to protect the innocent lower the leakage current.
Is there a reason you want to wire it in series instead of parallel?
Or just exploring your options?
basically lol. just curious as to the performance differences
Whether you wire them in parallel with 1 cell, or in series with 3 cells the emitters themselves will still see the same voltage. I would just go parallel for simplicity’s sake.