No, I did different exposures to show the beam profile clearer. The XPL is slightly brighter than 319A.
Check Texas_Ace’s signature for the test results. He did a very good test comparing XPL/XPL2 and 319A a while back.
Stormrider, I suggest you to create a new thread in Headlight section. We’ll continue there, for the sake of better indexing. So people will get what they “googled” for in BLF.
We’re already too far off the original topic here. This is a very interesting topic indeed and I think we better share it in the matching section so people can easily find it when they need related information.
See you there… 
- Clemence
I think a new topic would be better.
Running them in 6v in series or in 12V in parallel will net you the same results. Each LED will get 2.4A in series but they will only be at 6V, so the same amount of light at 1.2A at 12V.
I never really like triples or quads (except for tint mixing) as long as I can use bigger dies LED in a single optics. Smaller TIR will eats up efficiency and make beam control somewhat limited. If you have 4 XPGs and 1 XHP50 and you only want one beam profile pattern then go for XHP50 paired to a single bigger optics. For multi beam pattern try assymetric optics. If it’s unavailable then 4 different unique optics would be the next choice. FYI the output/efficacy of 4 x XPG3 setup is almost equal to a single XHP50.2.
- Clemence
Hey, coming in on the backside of this, I’m cooking up a build with an XHP50 (not the .2 version).
-First tried a 2A driver from mtnelectronics. On 3 CR123’s or 2 17500’s, I think it tried to fry my fingerprints off. Pretty sure that was too much current. Depending on the physical arrangements of the components it would actually run on high but I think I was nearing the limits of the components and it would go low. Did some math and realized the 6V led times 2A was 12w of power pulling way too hard on the batteries. I know there’s an XHP50 in the Lumens Factory mini-turbohead so it must be possible. There’s a sweet-spot for the current in there somewhere.
- I scaled back to a 1A driver currently and it’s calmed down. I have a 1.2A driver from Kaido on the way which I think should be a pretty good sweet spot. Going to try that out later. It’s an unbored 3-cell Surefire M3, so not a ton of power I can cram into it. My goal is a plug and play head that doesn’t require li-ion batteries. Either 2 17500’s or the option to run primaries in a pinch.
(going to transplant an SST-40 onto the 2A driver and see what that does. A 3V LED should play nice® in that configuration.)
Just want to thank djozz for putting this together! This post and the info herein, especially the output/lumens chart brought me to BLF.
Just now I noticed on the XHP50.2 on page 2 and page 3 there is a 3 volt version mentioned. Has anyone ever found this emitter for sale?
It says “3-V XHP50.2 LEDs are available only at 5000 K CCT.” And there is s drive current rating for it.
Hmmm, I seem to recall someone seeing that on either the 50.2 or the 70.2 but I haven’t heard of Cree actually releasing it.
This might also be a case where some big company special ordered a large batch of 3v versions to retro fit a cities worth of street lamps or something. I don’t think it necessarily means they will be selling a 3v version to the public.
Who knows, though.
It was mentioned in another thread as well but to date I have not heard of any spotted in the wild yet. I am also very interested in these. If someone finds some please let me know.
TA, congrats on 8k posts! 
LOL, I didn’t even realize I had posted that much.
It seems to be for sale!
Check out this thread for details.
I will have 100pc here in a couple days
Thanks for the heads up, now to find a 5000k version
For those of you that want some I have the 3 volt XHP50s in stock now.
https://asflashlights.com/home/130-cree-xhp-70-n4-5700k.html
Those are bare LEDs. When I get back on Monday if there are any left I will reflow some to mcpcbs.
Hi All,
I'm new to this forum and to Cree LEDs. I have a project in mind using the XHP50.2, however I can see that I'm at the bottom of a steep learning curve.
I intend powering the 6/12V version from a 3 cell LiPo
a Few questions if I may:
- I note that people mention reflectors. Were do I find these? I assume that they are a can of worms in their own right.
- Do you use propriety drivers, or do you manufacture these? i.e. do you use custom driver chips? Can I simply ise a mosFET driven from my processor?
- I was hoping to find built-in temperature sensors to manage heat - what do you guys do?
I anticipated seeing details of drivers and best practice in the Cree data sheets, but sadly no!
- Is there a 'must read' resource that you can recommend?
Kind regards
A
Welcome to BLF!
You are on a flashlight forum, so the solutions that many of us have for driving leds may be a bit different from what you need for your application. The electronics that we use to drive the leds are often small and simple and are low-voltage to have them run from batteries. Also we like to drive leds hard and do not care a lot about led life. Many flashlights do have thermo regulation though, not to keep them longterm happy but to prevent shortterm frying.
That said, we may have some help for you. There is not a short manual here on BLF, but there are some resources for leds and stuff, mainly this one may be of help: LEDs & Other Stuff - (Reference Guide) .
There are a few vendors that sell flashlight related parts, like leds, drivers, reflectors etc. Since you are in the UK, the US sources (mtnelectronics.com, illumn.com, Mouser, Digikey) are often too expensive because of shipping cost, others sources are kaidomain.com, banggood.com, led4power.com.
Nice, I have a few of these on order looks like they will be pretty good with a bit of drive, looking at your chart i may even swap out the Xhp70.2 in the L6 for one of these
Thanks for the quick reply.
That’s quite a reference, I’ll check it out!
Regards
A
I’ve got a question about driving the 6V XHP50.2.
I’m planning to run four 6V XHP50.2 in parallel on a 5050 Q8 MCPCB with a direct drive TA driver. I have read that the XHP50.2 6V is sensitive to overcurrent and gets dark dies fast. To limit the current in direct drive I would not bypass the tail spring, use 22 AWG wire and use only 10 or 20A max discharge cells. They would run on two 26350, 18350 or 26650 batteries in a Haikelite SC04.
I would also cut some traces on the Q8 MCPCB and add some sense resistors. Do you think it is enough if I add one R010 resistor for all four leds or would it be better to have one resistor for each led?
I would use two 5000K 90CRI H2 and two 2700K 90CRI G2. I don’t know if they have a different Vf so maybe I should use one resistor for the 5000K and one for the 2700K? Before I start the build I’m seeking advice from anyone who has experience with the XHP50.2 6V so that my leds will survive and run safely in this flashlight.