What current are you guys running your XPG-2s at?
I plan on building a p60 drop in with an XPG-2 mounted on a sinkpad but don’t want to over do the current.
2.2 amps on a normal aluminium star. Now let the fun begin.
Same here. I want to build an XP-G2 P60 tomorrow. I added an AMC 7135 chip to a 1400mA driver. Should 1750mA be pretty good with a neutral XP-G2? I already have a 2100mA driver, so there’s no point adding another chip.
Thanks for the quick replies.
Yea, I’ve seen that chart but that was tested with some pretty good heatsinking. Since this will be in a p60 host with not the best heatsinking I want to see what people general run them at.
I have a XP-G2 5000k on a sinkpad fed by one of vestureofblood's trick 2.8A drivers, it's nice. Only a 20mm reflector but still outthrows a P60/XML.
So 2.8 is no problem when mounted on a sinkpad even in a small host. Good to hear.
Yep, Trustfire TR-801, probably the best heat management I have seen in the little cylindrical lights. The outside ring of the pill is exposed and threaded on both ends, it acts as the connector between the head and body.
Awww, go ahead. We won’t tell. Promise.
I would not be surprised if you can run the XP-G2 on a well mounted Sinkpad in a well heatsinked flashlight at 5A with the led working alright and without it floating away.
On our T20's, djozz has his dedomed XP-G2 at 3.05A on a SinkPAD, I got mine w/dome at 3.85A on a SinkPAD. From my experiences, Match's graphs are pretty accurate (his XR-E's graphs seem dead on). I believe it was posted also that a SinkPAD in a flashlight and a SinkPAD on Match's setup is effectively the same - not sure about the alum stars.
I think I’ll run it at 2.45 amps by removing one 7135.
So on these copper sinks we can push g2’s to 3 or 4A… In a light? Real world usage?
yup!
there’s a few caveats.
I would pick a light of substantial mass, I would prefer a brass/copper pill, I would be inclined to solder/silver solder the sinkpad to the pill then flow the emitter to the sinkpad.
I would want a good thermal path to the outside, yes you can push 4 - 5 amp into an xp-g2, provided you deal with heat effectively.
The deft x runs at these currents and is a commercially viable light. There are a few people on here pushing 4a and not using what I suggested, I both trust and value their experience so I would follow them.
I am planning on a similar hi current build myself this year in a 55mm head, I figure it will be comparable to a jacob a60 in throw but with a much brighter spill.
One thing for sure, the xp-g2 is shapng up to be the new xr-e r2 in terms of producing hi lux throwers, heck, it already holds the record - deft x again.
Please note the write-up on the bottom of the opening post in this thread: https://budgetlightforum.com/t/-/16621 by Match. He's saying there's very little difference in results between a SinkPAD and a large copper milled PCB. This is a very meaningfuil quote from Match:
"I'll let the data speak for itself, but suffice to say that with the availability of these sinkpads, I've milled my last copper pcb"
This doesn't mean we don't need additional mass and heat sinking, but the direct bonding days seem to be over. I'll typically go to 3.85A in a C8 sized pill, but this is with adding copper inside the pill, and expecting short duration runs on high, upt to 6-7 minutes, from my testing. 4.2A amps I go with in lights like an HD 2010 or Small Sun T08 - those bigger sized lights, but thinking could push it higher still to 4.5A maybe, taking into account switches, spring wiring, heavier LED wiring, etc.
and there is the person I’d listen too.↑
follow tom, you wont go far wrong.
And there is obviously no reason whatsoever why a flashlight than can heatsink a xml at 3A cannot heatsink a xpg2 at 3A. Only what is critical is getting the heat away fast close to the led, and that is what the sinkpad does.
I'm not an expert by any means and this isn't backed up by data like others here have, but I can offer an explanation for how this works. As you follow the thermal path from the source, the center pad of the LED, through to the outside air, at each junction the surface area for heat transfer increases greatly. From the LED pad to the SinkPAD, SinkPAD is vastly bigger. The pill is vastly bigger than the SinkPAD. Whatever the pill is attached to is vastly bigger than the pill. Each step you get farther from the tiny little heat source, the quality of the junction matters less and less, because the contact area is so much bigger.
comfychair - that's a great explanation, I've heard it stated, but not explained like that. I know some consider 3.5A over the top, but think how a lot of the preferred lights behave in a stock configuration - an HD 2011 EDC - runs direct drive, 3.xx amps or even higher. An HD 2010 or Keygos KE-5: 4-5 amps or even higher, direct drive stock lights. So, running 3.85A or 4.2A regulated with additional heat sinking, replacing switches, etc., is far better. Would love to have temperature monitoring in a Nanjg driver but that's not here yet.