Hey! I have this Ultrafire 7x xm-l2 from dealextreme, it has a power display, charging port, cool features. Never seen a skyray like this before. I really like it but had the Idea of turning it into 7x xhp50? What do you huys think about that? How should I go about powering it all?
you had me laughing so hard omg.
haha, how do I fit those batteries in?
i hope you have fire extinguishers handy, because that will be one scorching hot light.
You might find that with 7x xhp50 your light is waaayyy underpowered… I´d go for 7x xhp70 in direct drive… just sayin´ 
They are twice the price though.
built sprinkler system
I dont know, maybe design it so its submerged in coffee, it heats coffee up? LMAO… digital coffee warmer
Haha, you guys must think I’m crazy, but I once saw old lumens had a build with 7x xhp70
Can you link that SRK?
Probably this http://www.dx.com/p/ultrafire-xm-l2-u2-7-l2-6287lm-flashlight-kit-w-multi-tool-4-18650-448969#.WHjbRrVOL7o
Thanks
Neat switch setup and it looks like real cree LEDs
hit it with the shrink ray?
you do know that flash boiling coffee ruins it?
Would not be easy… I am guessing the XM-L2 emitters are all wired parallel, since its an odd number. The cells are arranged 4P, so voltage on-tap to the driver is only 3.6-4.2V and thus it only needs to buck down to ~2.85Vf.
You are attempting to replace 2.85V emitters with a ones that require 6-12V. So a straight up LED swap one for one would not be possible…. I don’t think.
Thats a cool light though I would just leave it stock. Maybe if anything look into stacking a sense resistor to up the current.
Gearbest has a flash sale on backpacks.
I built an 8X SRK XHP50 light awhile back, it made over 17,000 lumens while purposely trying to lower current with thin/long wires ect. It should do over 20k lumens if I really tried. That is till one of the domes started burning, got to shave that one before it kills the LED.
Lessons I learned from this, you will need to mod the light with a custom built shelf 100%. The heat is INSANE. I have another 8x XM-L2 SRK making ~9000 lumens and it is nothing compared to this beast. They are both modded with a solid 1/2” thick hunk of aluminum to give the heat someplace to go.
I used the stock MCPCB in both of them (which is why I do not try to optimize current, I want it to stay around ~3A per emitter), if you used DTP stars you could get more as well but it would be a LOT of work.
For the driver I used the Texas avenger multicell driver, it works but Narsil Triple channel is still a work in progress. I have some extra PCB’s if anyone is interested, I had to order 10 of them.
The real take away from all of this though is that while the XHP50 version is a lot of fun and bright as heck, it is all flood and even has a donut hole still. Great for lighting up everything in the area.
The XM-L2 version on the other hand is a more balanced beam, it has a large but noticeable hot spot and while still very floody it is one of my most used lights for this reason.
I actually have 1 of the 8x SRK’s left with the shelf installed for sale if anyone is interested. I would not try any mods without some form of shelf, the floating MCPCB is not good.