Yes the thread is a little old. Have you considered just changing from 4 series XM-L2’s to 4 parallel XHP35’s. I read your review on it’s driver and came up with this from your numbers. Series the theoretical of the XM-L2 U2 is just over 950 lumens. Divide by 4 for the parallel XHP35 F2 HD and the theoretical is just over 1220 lumens. Needed forward voltage is 13.24 for the XM-L, only 12.23 for the XHP35. That’s without any driver mods and 2.5 less watts used.
I’m planning to mod my TM16GT from 4x XP-L HI in series to 4x XHP-35 HI in parallel.
Took some measurements and the VF looks pretty convincing:
According to XHP-35 spec sheet Vf at 1A should be around 12.3V, and since the stock driver won’t drive the LED at 1A each, I guess we’re fine.
The reflector opening is exactly 9mm and the convoy L2 spacer fits perfectly, although too tall for proper focusing. I ordered some custom spacer from Hoop. Stock MCPCB will not work here, noctigon should be 20mm to clear for the reflector base and they have to be cut in half near the center using a dremel to fit 4 of them.
Then the 4x XHP35 HI will be wired parallel with 22AWG wire. Anyone know if the NTC resistor is required for the driver to work?
The XHP-35 HI is available on LEDDNA & ebay but the bin is unknown… well I don’t think I’ve got many choices neither for CW tint.
I sure hope so, I think I was the one who put the numbers out. I did do the numbers with top bin High Density XHP35’s at a projected 0.625 amps. It was a guess from your readings on your website review. 1220 lumens best bin HD/1000 lumens best bin HI. Those number don’t quit take into account that your needed voltage will be slightly lower.