Its lumen output /the auto industry (mainly due to its working voltage)/oveall 12v applications: at 12v you can straight use it with a siple resistor as a driver
Thanks for your input. But I meant what makes the XHP35 emitter with this particular driver interesting for flashlights. For instance, I want to do some emitter/driver swaps with my Convoy L6. Why would I use this driver with the XHP35 emitter, if I can have an XM-L2 at around 5A resulting (I think) in slightly less lumens, but much higher lux values?
Its all about marketing m8, a good binned V6/U4 will give you nearly 1900 lumens output and way better candelas, yet companies use XHP35 cause its new, have more lumens at its default values that XML/XPL and will bring aditional sales
Most of those companies used and are still using Cree XB-H for the same reason: its new, atracive…and they all need your money 
Ofc XHP35 is way more usable in a flashlight than XB-H yet its main idea is different
But also great throw has been achieved with xhp35, like Acebeam K70 and Thrunite tn42 (But ofcourse these flashlights can throw way better with smaller dye leds , like xpl / xpg2 dedomed)
Hmmm…. So I’m not convinced about this driver then. It seems that the XHP35 is only more interesting for flashlights, if you drive it harder to get more like 2500 lumens like with the Acebeam K70 to step up the lumen game compared to XM-L2. And as you indirectly mentioned, if yo have a 3 cell host, then you could direct drive the XHP35. But that will result in quite some more amps than 1.5 that this LD-51 driver is pushing.
Dont be, i got 5 of those, already modded an L2 host( with 5mins machine work ofc) with 2 x 26350s ,this driver and a D4 1A binned emitter - viola,2000 lumens 228k cds lovely flashlight, quite pocketable too: it has a huge halo also: great as an offhand hunting searchlight or something simmilar
at 1.5amps the torch is runing an idea cooler than a hard puched V6 one
Yeah….personaly i am quite impatient for it to be shipped Will dismantle it asap, that huge reflector needs atention!
Nice stats. So with a larger reflector in the L6 you should get like, what 250~300 cds or something (with smooth reflector)? Nice. Yeah it runs cooler; that’s nice too.
The XHP35 is going to be more efficient for a given lumens over other options. Also the domed version of the 35 can make almost 3000 lumens, so when compared apples to apples the difference is more noticeable.
From what I have read it seems to put out throw numbers like an XP-L hi with almost twice the lumens.
As MRsDNF already pointed out, you can’t drive the newer XM-L2s over 5A unless you want to let the magic smoke out.
That being said, here are the numbers from one of Djozz’s tests.
XM-L2 @ 5A, 3.8Vf = 1550lm for 81.57 lm/W
Since neither he, or anyone else I know of has tested the XHP35 in overdrive, I’ll just use Cree’s numbers for the highest binned XHP35 HI.
1833lm @ 13W for 141 lm/W.
ETA: It occurred to me those numbers seemed high, so I wen’t to Cree’s PCT and pulled some better numbers, better in terms of probably being more accurate, not necessarily higher. Still run at spec though.
XHP35 HI @ 1.05A, 12.776Vf = 1536lm for 120 lm/W
That’s for a Factory De-Domed emitter in the tint I want, with higher output at factory spec versus overdriven to the max, and no tint lottery or chance of failure from de-doming. Should be noted the XM-L2 test above was done dome-on. Does the XHP35 lose out to the XM-L2 on peak lux? Maybe, maybe not, IDK, but at well over 2000lm I’m not sure it’d be noticeable in the applications I use it for at ranges usually not over 200m. May not be for everyone, and other LEDs may better in certain applications, but no doubt it’s a beast in a relatively small form factor.
There are some impressive lights built by members here with pics buried in one of the threads here, I can’t remember which one or I’d link it.
-Michael
Thank you all for your input! Time to do some thinking again
What? You stopped thinking. Oh the shame. 
My brain is sometimes like a clone of a clone of a Skyray King with floating MCPCB; it overheats quickly 
Switch on for a couple of minutes, switch off for a couple of minutes…
Getting 2.5 amps out of it on Turbo, 1.72 amps on High .15 amps Low @ the emitter a 12v XHP70 by jumping the unmarked resistor. Driver over heats fast! 
:+1:
Awesome! Thanks for testing it out.
Those numbers are at the emitter I presume? What numbers do you get at the battery’s, and what battery’s did you use?
-What unmarked resistor do you mean? All the resistors on the drivers I have are all marked.
One with R010 and the other one with R050 with a big white stripe above it. They are the same size and the perfect size for a sense resistor.-
The other driver does have a unmarked resistor, it is the bigger resistor next to the negative ledwire?
Yes at the emitter, Yes the big resistor at the Negative LED wire and 5.5+ at the battery. All 3 of my drivers are unmarked. At 1.7amps it seems the driver is fine but at 2.5amps the coil/inductor over heats and power drops rapidly. I over heated it 3-4 times and it still functioned after cooling down.
Awesome so it need a lot of cooling for higher outputs bit it can Withstand it for a couple times.
Yep it’s proving to be pretty tough so far! :+1:
Pulled the original resistor off and staked a R180 and 2 R10’s for 1.8amp at turn on and after 2.3mintes it dropped to 1.66 amps. I had an aluminum block on the coil and it was warm, so the driver will need to be sinked half way decent at this current. 3.55amps at the batteries at 2.30 minutes, didn’t check at start up, just wanted to see if it would just up and quit!
New driver with R010 resistor stacked on, gives 2.05 amps at the emitter, 4.79 at the battery! I don’t think this driver will survive past this current. At 2.30amps and the driver sinked it drops out in seconds!
Unless the components on this driver can be upgraded?
Need to find a host and do a build, and sink the heck out of this driver, but at just over 2 amps it should be pretty decent in a 2S side by side battery compartment style host with a big reflector, know of any?
If the driver must have better heat sinking and you are at the limits, the best thing is to pot the heck out of it.
I have a TINY little driver running 3A in an old ultrafire zoomie that I potted with RTV. It works great and has held up surprisingly well. Same for the LED. I didn’t expect them to work so well or so long with how hot they were getting during testing.