Nice! Just got in the single LED version ($12 shipped from Ali store here), so could do something with the optics now, least a copper MCPCB I hope.
For the double LED previously modded, I sanded down the scratched end cap so now it's smooth alum - scratches still there but not as noticeable - looks better.
I went out and used my D25 a couple nights ago while I applied crabgrass preventer to my nearly 1 acre. It lit up the yard nicely. And with it being mildly cool out, the temp regulation* helped keep things bright but still in check.
*Stock light does not have temp regulation… It gained that after my MCU swap
Was able to fit a couple of 60deg 17mm Yajiameis in mine. Had to sand down the diameter and base of the optics until they fit. Also swapped in some neutral white XML2s. Can’t remember exact tint but probably 4C.
In preparation of my review of the D25 I noticed something odd about the beam profile. The spot is darker in the center, seems like a slight donuthole.
Could it be that this is the result of the overlay of two emitter beams, causing areas of erasure and amplification?
PCB part just under MCU (between MCU and FET Q1) is different as well. It would be nice to check PCD layout on the back side, but it look like divers are a bit different. I would rather expect the same MCU on both. Used FETs and resistors are different probably due to number of leds used, but I think that schematics might be the same for both. Maybe one of those is just an newer revision.